strpbrk
This is the code,I wrote today, I wanted to strip all the newlines, and format the output in a single line so as to lower the filesize of my php source files.
<?php
/****************************************
@ Code By : Samundra Shrestha
@ Dated : September 28,2008
P.S. Remember to remove all single line comments from the source file
otherwise the file may get corrupted.
******************************************/
if(!isset($_POST['change']) || !isset($_POST['filename']))
{
print "<b>".strtoupper("Paste the fullpath of the file")."</b>";
print "<form name='FrmChange' method='post' action='".$_SERVER['PHP_SELF']."'>";
print "<input type='textbox' name='filename' size='50px' maxlength='255'>";
print "<input type='submit' name='change' value='Start'>";
print "</form>";
}
else
{
$filename=$_POST['filename'];
if(!$fpin=@fopen($filename,"r"))
{
print "<b>Error ! File Doesn't Exists</b>";
exit();
}
$text="";
$i=0;
/*Put the contents of file into the string*/
while(!feof($fpin))
{
$text.=fread($fpin,1024);
}
$count=strlen($text);
$pos=strpos($text,"\n"); //Gives the First occurence of newline
while($i<$count)
{
if($i<$pos-1)
{
$newtext.=$text{$i}; //C Style of String Indexing
}
else
{
$pos=strpos($text,"\n",$i+1);
}
$i++;
}
$newtext.="?>"; //necessary as somehow it is removed from the original source file.
$fp=fopen("sample.txt","wb+");
fwrite($fp,$newtext);
fclose($fp);
print "File Changed Successfully.";
}
?>
The resultant code is all in one new line saved in file sample.txt
I hope, this comes handy to someone.
Cheers,
Samundra Shrestha
http://www.samundra.com.np
strpos
(PHP 4, PHP 5)
strpos — 文字列が最初に現れる場所を見つける
説明
文字列 haystack の中で、 needle が最初に現れた位置を数字で返します。 PHP 5 以前の strrpos() とは異なり、この関数は needle パラメータとして文字列全体をとり、 その文字列全体が検索対象となります。
パラメータ
- haystack
-
検索を行う文字列。
- needle
-
needle が文字列でない場合は、 それを整数に変換し、その番号に対応する文字として扱います。
- offset
-
オプションのパラメータ offset により、 検索を開始する haystack の文字を指定することができます。 この場合でも、返される位置は haystack の先頭からの相対位置となります。
返り値
位置を表す整数値を返します。 needle が見つからない場合、 strpos() は boolean FALSE を返します。
例
例1 === の使用
<?php
$mystring = 'abc';
$findme = 'a';
$pos = strpos($mystring, $findme);
// === を使用していることに注目しましょう。単純に == を使ったのでは
// 期待通りに動作しません。なぜなら 'a' が 0 番目 (最初) の文字だからです。
if ($pos === false) {
echo "文字列 '$findme' は、文字列 '$mystring' の中で見つかりませんでした";
} else {
echo "文字列 '$findme' が文字列 '$mystring' の中で見つかりました";
echo " 見つかった位置は $pos です";
}
?>
例2 !== の使用
<?php
$mystring = 'abc';
$findme = 'a';
$pos = strpos($mystring, $findme);
// !== 演算子も使用可能です。ここで != を使っても期待通りに動作しません。
// なぜなら 'a' が 0 番目の文字だからです。(0 != false) を評価すると
// false になってしまいます。
if ($pos !== false) {
echo "文字列 '$findme' が文字列 '$mystring' の中で見つかりました";
echo " 見つかった位置は $pos です";
} else {
echo "文字列 '$findme' は、文字列 '$mystring' の中で見つかりませんでした";
}
?>
例3 オフセットの使用
<?php
// オフセット以前の内容を無視して文字を探すこともできます。
$newstring = 'abcdef abcdef';
$pos = strpos($newstring, 'a', 1); // $pos は 0 ではなく 7 となります。
?>
注意
注意: この関数はバイナリデータに対応しています。
add a note
User Contributed Notesstrpos
samundra dot shr at gmail dot com
28-Sep-2008 03:40
28-Sep-2008 03:40
mickRacky
20-Sep-2008 03:17
20-Sep-2008 03:17
here's a php implementation of stdc++ string class find_first_of using strpos.
<?php
function find_first_of($haystack, $needlesAsString, $offset=0)
{
$max = strlen($needlesAsString);
$index = strlen($haystack)+1;
for($ii=0; $ii<$max;$ii++){
$result = strpos($haystack,$needlesAsString[$ii], $offset);
if( $result !== FALSE && $result < $index)
$index = $result;
}
return ( $index > strlen($haystack)? FALSE: $index);
}
?>
Example:
<?php
$test="Ralph: One of these days, Alice!!";
$look_for=":!,"; // punctuation marks
$ss = 0;
while( $answer=find_first_of($test,$look_for,$ss) ) {
echo $answer . "\n";
$ss = $answer+1;
}
?>
This prints out:
5
24
31
32
Wartosh
22-Aug-2008 06:01
22-Aug-2008 06:01
Hi,
Chuzasoft Inc : maybe I haven't understood your goal clearly, but I think there is a faster way to determinate whether a pattern is contained in a string (like using the " LIKE '%bla bla%' " in SQL).
You should read about "Regular Expression" (powerfull string operations are allowed using it) : http://fr.php.net/manual/en/book.pcre.php
Your example, it should be written like this :
<?
$myString = "Hi, this is good!";
$srchStrg = ".*thi.* goo.*";
$srchRes = preg_match("/$searchThis/", $myString);
if ( $searchResult != 0 )
echo "TRUE: string has been found :-)";
else
echo "FALSE: string wasn't found :'-(";
?>
Sincerely
Chuzasoft Inc. ARGENTINA
06-Aug-2008 04:16
06-Aug-2008 04:16
Hi! Don't you people miss the pretty comparison operator 'LIKE' from mySql in PHP??.
I've made this funtion to emulate that method. It's for search a match string into another String
using the '%' caracter just like you do un the LIKE syntax.
For example:
<?php
$mystring = "Hi, this is good!";
$searchthis = "%thi% goo%";
$resp = milike($mystring,$searchthis);
if ($resp){
echo "milike = VERDADERO";
} else{
echo "milike = FALSO";
}
?>
Will print:
milike = VERDADERO
and so on...
this is the function:
<?php
function milike($cadena,$busca){
if($busca=="") return 1;
$vi = split("%",$busca);
$offset=0;
for($n=0;$n<count($vi);$n++){
if($vi[$n]== ""){
if($vi[0]== ""){
$tieneini = 1;
}
} else {
$newoff=strpos($cadena,$vi[$n],$offset);
if($newoff!==false){
if(!$tieneini){
if($offset!=$newoff){
return false;
}
}
if($n==count($vi)-1){
if($vi[$n] != substr($cadena,strlen($cadena)-strlen($vi[$n]), strlen($vi[$n]))){
return false;
}
} else {
$offset = $newoff + strlen($vi[$n]);
}
} else {
return false;
}
}
}
return true;
}
?>
Good luck!
majewsky at gmx dot net
27-Jun-2008 05:51
27-Jun-2008 05:51
Paul: May it be that the ! operator is evaluated before the ===? In this case, the return value of strpos (0 in the described case) would be implicitly converted to bool (value true because 0 converts to false). Then, true === false is evaluated to false.
paul at thiswayupdesign dot co dot uk
18-Jun-2008 07:48
18-Jun-2008 07:48
I wasn't aware of the !== operator, only the === for false. I was using this code on strpos:
while( ! ($start=@strpos($source,$startTag,$end)) === false)
This gave a false if the string was found at position 0, which is weird.
However using
while(($start=@strpos($source,$startTag,$end)) !== false)
Gives no such error and seems to work correctly
pawhox
26-May-2008 10:19
26-May-2008 10:19
Hello! I was founding a function, which finds any occurence of a string (no: first occurence). I wasn't, so I maked this function! It may be very useful.
<?php
int strnpos(string $haystack, mixed $needle, int $occurence);
?>
Example:
<?php
strnpos("I like the bananas. You like coke. We like chocolate.", "like", 2); // 24
?>
Here's code of this function:
<?php
function strnpos($base, $str, $n)
{
if ($n <= 0 || intval($n) != $n || substr_count($base, $str) < $n) return FALSE;
$str = strval($str);
$len = 0;
for ($i=0 ; $i<$n-1 ; ++$i)
{
if ( strpos($base, $str) === FALSE ) return FALSE;
$len += strlen( substr($base, 0, strpos($base, $str) + strlen($str)) );
$base = substr($base, strpos($base, $str) + strlen($str) );
}
return strpos($base, $str) + $len;
}
?>
ilaymyhat-rem0ve at yahoo dot com
02-Apr-2008 09:17
02-Apr-2008 09:17
This might be useful.
class String{
//Look for a $needle in $haystack in any position
public static function contains(&$haystack, &$needle, &$offset)
{
$result = strpos($haystack, $needle, $offset);
return $result !== FALSE;
}
//intuitive implementation .. if not found returns -1.
public static function strpos(&$haystack, &$needle, &$offset)
{
$result = strpos($haystack, $needle, $offset);
if ($result === FALSE )
{
return -1;
}
return $result;
}
}//String
loaded67 at hotmail dot com
21-Feb-2008 12:08
21-Feb-2008 12:08
Refereing to my last note.
It wasn't correct! As ctype_digit only evaluates strings.
(string) true / false will still be 0 / 1.
is_int(); is the correct function!
loaded67 at hotmail dot com
18-Feb-2008 03:22
18-Feb-2008 03:22
As mentioned before....
0 === false
0 == false
1 === true
etc...
I found it very usefull to use ctype_digit(); with this function!
<?php
$string = 'whatever!#%@^% is going on...'; //correct
//$string = 'whatever? is going on...'; //false char 8
//ctype_digit only works on strings so type cast...
if(ctype_digit((string) strpos($string, '?'))){
echo 'found at least one...<br/>'.PHP_EOL;
}
else{
echo 'no char index retrieved... <br/>'.PHP_EOL;
}
?>
amendment to last post on pink WARNING
12-Jan-2008 09:02
12-Jan-2008 09:02
There's actually a fourth conceivable test for "any position other than 0" --
ADD:
!= "" (disrecommended as highly confusing)
This then makes the final paragraph inaccurate (one case where comparing to "" is meaningful). It should just be removed entirely -- too much unneeded detail on a tangent anyway.
Suggested re-write for pink WARNING box
12-Jan-2008 08:45
12-Jan-2008 08:45
WARNING
As strpos may return either FALSE (substring absent) or 0 (substring at start of string), strict versus loose equivalency operators must be used very carefully.
To know that a substring is absent, you must use:
=== FALSE
To know that a substring is present (in any position including 0), you can use either of:
!== FALSE (recommended)
> -1 (note: or greater than any negative number)
To know that a substring is at the start of the string, you must use:
=== 0
To know that a substring is in any position other than the start, you can use any of:
> 0 (recommended)
!= 0 (note: but not !== 0 which also equates to FALSE)
!= FALSE (disrecommended as highly confusing)
Also note that you cannot compare a value of "" to the returned value of strpos. With a loose equivalence operator (== or !=) it will return results which don't distinguish between the substring's presence versus position. With a strict equivalence operator (=== or !==) it will always return false.
Lau
24-Dec-2007 09:45
24-Dec-2007 09:45
WARNING: The documentation says:
"Use the === operator for testing the return value of this function"
but it should say:
"Use '!== false' or '=== false' for testing the return value of this function"
Therefore to test if a needle occurst in a hastack do this:
if ( strpos($haystack, $needle) !== false){
echo 'found needle in haystack!';
}
Using '=== true' or '!== true' or '== true' or '== false' will all return the wrong value when the needle is found in the haystack.
using ' >= 0 ' returns the wrong value when the needle is not found in the haystack.
By "wrong value" I mean a value that is counter-intuitive but is never-the-less correct according to the weird way in which strpos has been coded. Why on earth didn't they just return -1 if the needle was not found? Then we could just test for >= 0
Here's a full list of the value returned:
(strpos("bbb", "aaa") >= 0) returns true EXPECTED FALSE
(strpos("bbb", "aaa") == true) returns false expected false
(strpos("bbb", "aaa") == false) returns true expected true
(strpos("bbb", "aaa") === true) returns false expected false
(strpos("bbb", "aaa") === false) returns true expected true
(strpos("bbb", "aaa") !== false) returns false expected false
(strpos("bbb", "aaa") !== true) returns true expected true
(strpos("aaa", "aaa") >= 0) returns true expected true
(strpos("aaa", "aaa") == true) returns false EXPECTED TRUE
(strpos("aaa", "aaa") == false) returns true EXPECTED FALSE
(strpos("aaa", "aaa") === true) returns false EXPECTED TRUE
(strpos("aaa", "aaa") !== false) returns true expected true
(strpos("aaa", "aaa") === false) returns false expected false
(strpos("aaa", "aaa") !== true) returns true EXPECTED FALSE
giulioNOSPAM at iunknown dot org
31-Oct-2007 07:19
31-Oct-2007 07:19
A further implementation of the great rstrpos function posted in this page. Missing some parameters controls, but the core seems correct.
<?php
// Parameters:
//
// haystack : target string
// needle : string to search
// offset : which character in haystack to start searching, FROM THE END OF haystack
// iNumOccurrence : how many needle to search into haystack beginning from offset ( i.e. the 4th occurrence of xxx into yyy )
function rstrpos ($haystack, $needle, $offset=0, $iNumOccurrence=1)
{
//
$size = strlen ($haystack);
$iFrom = $offset;
$iLoop = 0;
//
do
{
$pos = strpos (strrev($haystack), strrev($needle), $iFrom);
$iFrom = $pos + strlen($needle);
}
while ((++$iLoop)<$iNumOccurrence);
//
if($pos === false) return false;
//
return $size - $pos - strlen($needle);
}
?>
Benjie
14-Oct-2007 08:49
14-Oct-2007 08:49
str_replace evaluates its arguments exactly once.
for example:
<?php
$page = str_replace("##randompicture##", getrandompicture(), $page);
?>
will call getrandompicture() once, ie it will insert the same random picture for each occurrence of ##randompicture## :(
Here is my quick and dirty workaround:
<?php
function add_random_pictures($text) {
while (($i = strpos($text, "##randompicture##")) !== false) {
$text = substr_replace($text, getrandompicture(), $i, strlen("##randompicture##"));
}
return $text;
}
$page = add_random_pictures($page);
?>
HS_AT_Duijst_DOT_com
09-Sep-2007 06:51
09-Sep-2007 06:51
Just to be clear: unlike stripos(), strpos() is case-sensitive.
Cybertinus
28-Aug-2007 08:05
28-Aug-2007 08:05
@Wagner Christian:
Yes, there are better methods. The best is to just cast is. You cast like this:
<?php
$id = 1;
$string = (string) $id;
?>
If you var_dump() $string now you get the following output:
string(1) "1"
This is the recommended method. You're example should look like this then:
<?php
$id = 1;
$my_text = "hel124lo";
$first_position =strpos($my_text , (string) $id);
?>
Wagner Christian
17-Aug-2007 05:11
17-Aug-2007 05:11
If you plan to use an integer as needle you need first to convert your integer into a String else it's not going to work.
For exemple :
<?php
$id = 1;
$my_text = "hel124lo";
$first_position =strpos($my_text ,substr($id,0));
?>
There are for sure some another solutions to convert an integer into a string in php.
user at nomail dot com
15-May-2007 06:21
15-May-2007 06:21
This is a bit more useful when scanning a large string for all occurances between 'tags'.
<?php
function getStrsBetween($s,$s1,$s2=false,$offset=0) {
/*====================================================================
Function to scan a string for items encapsulated within a pair of tags
getStrsBetween(string, tag1, <tag2>, <offset>
If no second tag is specified, then match between identical tags
Returns an array indexed with the encapsulated text, which is in turn
a sub-array, containing the position of each item.
Notes:
strpos($needle,$haystack,$offset)
substr($string,$start,$length)
====================================================================*/
if( $s2 === false ) { $s2 = $s1; }
$result = array();
$L1 = strlen($s1);
$L2 = strlen($s2);
if( $L1==0 || $L2==0 ) {
return false;
}
do {
$pos1 = strpos($s,$s1,$offset);
if( $pos1 !== false ) {
$pos1 += $L1;
$pos2 = strpos($s,$s2,$pos1);
if( $pos2 !== false ) {
$key_len = $pos2 - $pos1;
$this_key = substr($s,$pos1,$key_len);
if( !array_key_exists($this_key,$result) ) {
$result[$this_key] = array();
}
$result[$this_key][] = $pos1;
$offset = $pos2 + $L2;
} else {
$pos1 = false;
}
}
} while($pos1 !== false );
return $result;
}
?>
Rich Deeson
27-Apr-2007 12:58
27-Apr-2007 12:58
Here's a somewhat more efficient way to truncate a string at the end of a word. This will end the string on the last dot or last space, whichever is closer to the cut off point. In some cases, a full stop may not be followed by a space eg when followed by a HTML tag.
<?php
$shortstring = substr($originalstring, 0, 400);
$lastdot = strrpos($shortstring, ".");
$lastspace = strrpos($shortstring, " ");
$shortstring = substr($shortstring, 0, ($lastdot > $lastspace? $lastdot : $lastspace));
?>
Obviously, if you only want to split on a space, you can simplify this:
<?php
$shortstring = substr($originalstring, 0, 400);
$shortstring = substr($shortstring, 0, strrpos($shortstring, " "));
?>
14-Apr-2007 11:18
Thanks to spinicrus (see above) I have sorted out a problem that was bugging me for ages. I have a routine in Etomite Content Management System that will display a set number of characters of a news item and invite visitors to "Read more".
Unfortunately the 400 character summary sometimes displayed a partial word at the end.
Using the following code based on spinicrus's exampleI have now overcome this.
#################################
#only full word at the end
$string=$rest;
$charToFind=" ";
$searchPos = $lentoshow;
$searchChar = '';
//
while ($searchChar != $charToFind) {
$newPos = $searchPos-1;
$searchChar = substr($string,$newPos,strlen($charToFind));
$searchPos = $newPos;
}
$rest=substr($string,0,$searchPos)." ";
################################
sinai [at] simnet [dot] is
11-Apr-2007 09:35
11-Apr-2007 09:35
If you want to check for either IE6 or 7 individually.
<?php
function browserIE($version)
{
if($version == 6 || $version == 7)
{
$browser = strpos($_SERVER['HTTP_USER_AGENT'], "MSIE ".$version.".0;");
if($browser == true)
{
return true;
}
else
{
return false;
}
else
{
return false;
}
?>
gal_chen123 at hotmail dot co dot il
04-Apr-2007 01:57
04-Apr-2007 01:57
this function returns the text between 2 strings:
function get_between ($text, $s1, $s2) {
$mid_url = "";
$pos_s = strpos($text,$s1);
$pos_e = strpos($text,$s2);
for ( $i=$pos_s+strlen($s1) ; ( ( $i < ($pos_e)) && $i < strlen($text) ) ; $i++ ) {
$mid_url .= $text[$i];
}
return $mid_url;
}
if $s1 or $s2 are not found, $mid_url will be empty
to add an offset, simply compare $pos_s to the offset, and only let it continue if the offset is smaller then $pos_s.
IcEye
26-Jan-2007 04:23
26-Jan-2007 04:23
Get text between $s1 and $s2, return an array contains every occurrence (based on code of old comment/s but with offset and without strtolower)
Sample:
$myDivsContent = getStrsBetween("<div","</div>",$myHtmlSrc);
Sample:
or...get rows for html table
...
...
//using TextBetween from old comment...
$aTable = TextBetween("<table","</table>",$myHtmlSrc);
$rows = getStrsBetween("<tr","</tr>",$aTable);
...
...
function getStrsBetween($s1,$s2,$s,$offset=0){
$result = array();
$index= 0;
$L1 = strlen($s1);
$found = false;
do{
if($L1>0){
$pos1 = strpos($s,$s1,$offset);
}
else {
$pos1=$offset;
}
if($pos1 !== false){
if($s2 == '')
$result[$index++]= substr($s,$pos1+$L1);
$pos2 = strpos(substr($s,$pos1+$L1),$s2,$L1);
if($pos2!==false){
$result[$index++]= substr($s,$pos1+$L1,$pos2);
$offset += $pos2 + strlen($s2);
}
else{
$pos1 = false;
}
}
}while($pos1 !== false);
return $result;
}
BUGs/Problems:
Function do not stop while $s1 is found in $s.
jamie at jamiechong dot ca
20-Jan-2007 05:15
20-Jan-2007 05:15
Try this function to find the first position of needle before a given offset.
For example:
<?php
$s = "This is a test a is This";
$offset = strpos($s, "test");
strnpos($s, "is", $offset); // returns 17
strnpos($s, "is", -$offset); // returns 5
// Works just like strpos if $offset is positive.
// If $offset is negative, return the first position of needle
// before before $offset.
function strnpos($haystack, $needle, $offset=0)
{
if ($offset>=0)
$result=strpos($haystack, $needle, $offset);
else
{
$offset=strlen($haystack)+$offset;
$haystack=strrev($haystack);
$needle=strrev($needle);
$result=strpos($haystack, $needle, $offset);
if ($result!==false)
{
$result+=strlen($needle);
$result=strlen($haystack)-$result;
}
}
return $result;
}
?>
14-Jan-2007 09:52
this is nice you are so excited but parsing href=" will never really work.
remember whitespaces
mvp at mvpprograms dot com
29-Dec-2006 05:30
29-Dec-2006 05:30
I understand the excitement of "admin at xylotspace dot com." I wrote three functions that I use in EVERY website I develop. What they do is get the text between strings. I made them case-insensitive (for php < 5) using "strtolower." This would not be necessary if you used "stripos." Now the first function is close to what "admin at xylotspace dot com" wrote, but does not have the position element. It also will return an empty string if no substring was found. If you want to get the title of an HTML document use:
TextBetween('<title>','</title>',$content);
The second function was revolutionary for me, because it gets an array of items between pairs of strings. So, with that I can grab most XML lists, or get all the links or images in a document. All the links in a document could be found using:
TextBetweenArray('href="','"',$content);
The third is less used, but is useful to process an array and get substrings within each record.
//-----GET TEXT BETWEEN STRINGS------
function TextBetween($s1,$s2,$s){
$s1 = strtolower($s1);
$s2 = strtolower($s2);
$L1 = strlen($s1);
$scheck = strtolower($s);
if($L1>0){$pos1 = strpos($scheck,$s1);} else {$pos1=0;}
if($pos1 !== false){
if($s2 == '') return substr($s,$pos1+$L1);
$pos2 = strpos(substr($scheck,$pos1+$L1),$s2);
if($pos2!==false) return substr($s,$pos1+$L1,$pos2);
}
return '';
}
//-----GET ARRAY TEXT BETWEEN STRINGS------
function TextBetweenArray($s1,$s2,$s){
$myarray=array();
$s1=strtolower($s1);
$s2=strtolower($s2);
$L1=strlen($s1);
$L2=strlen($s2);
$scheck=strtolower($s);
do{
$pos1 = strpos($scheck,$s1);
if($pos1!==false){
$pos2 = strpos(substr($scheck,$pos1+$L1),$s2);
if($pos2!==false){
$myarray[]=substr($s,$pos1+$L1,$pos2);
$s=substr($s,$pos1+$L1+$pos2+$L2);
$scheck=strtolower($s);
}
}
} while (($pos1!==false)and($pos2!==false));
return $myarray;
}
//-----GET SUBTEXT IN ARRAY ITEMS------
function SubTextBetweenArray($s1,$s2,$myarray){
for ($i=0; $i< count($myarray); $i++)
{$myarray[$i]=TextBetween($s1,$s2,$myarray[$i]);}
return $myarray;
}
koteskie at gmail dot com
18-Dec-2006 07:31
18-Dec-2006 07:31
I've been looking at previous posts and came up with this function to find the start and end off an certain occurance or all occurances of needle within haystack.
I've made some minor tweaks to the code itself, like counting the length of needle only once and counting the result set array instead of using a count variable.
I also added a length parameter to the result set to use in a following substr_replace call etc...
<?php
function strpos_index($haystack = '',$needle = '',$offset = 0,$limit = 99,$return = null)
{
$length = strlen($needle);
$occurances = array();
while((($count = count($occurances)) < $limit) && (false !== ($offset = strpos($haystack,$needle,$offset))))
{
$occurances[$count]['length'] = $length;
$occurances[$count]['start'] = $offset;
$occurances[$count]['end'] = $offset = $offset + $length;
}
return $return === null ? $occurances : $occurances[$return];
}
?>
Charles
04-Dec-2006 05:10
04-Dec-2006 05:10
Small improvement on the efforts of others:
<?php
function strpos_all($hs_haystack, $hs_needle, $hn_offset = 0, $hn_limit = 0) {
$ha_positions = array();
$hn_count = 0;
while (false !== ($pos = strpos($hs_haystack, $hs_needle, $hn_offset)) && ($hn_limit == 0 || $hn_count < $hn_limit)) {
$ha_positions[] = $pos;
$hn_offset = $pos + strlen($hs_needle);
++$hn_count;
}
return $ha_positions;
}
function preg_pos($hs_pattern, $hs_subject, &$hs_foundstring, $hn_offset = 0) {
$hs_foundstring = NULL;
if (preg_match($hs_pattern, $hs_subject, $ha_matches, PREG_OFFSET_CAPTURE, $hn_offset)) {
$hs_foundstring = $ha_matches[0][0];
return $ha_matches[0][1];
}
else {
return FALSE;
}
}
function preg_pos_all($hs_pattern, $hs_subject, &$ha_foundstring, $hn_offset = 0, $hn_limit = 0) {
$ha_positions = array();
$ha_foundstring = array();
$hn_count = 0;
while (false !== ($pos = preg_pos($hs_pattern, $hs_subject, $hs_foundstring, $hn_offset)) && ($hn_limit == 0 || $hn_count < $hn_limit)) {
$ha_positions[] = $pos;
$ha_foundstring[] = $hs_foundstring;
$hn_offset = $pos + 1; // alternatively: '$pos + strlen($hs_foundstring)'
++$hn_count;
}
return $ha_positions;
}
print_r(preg_pos_all('/s...s/', "she sells sea shells on the sea floor", $ha_matches));
print_r($ha_matches);
?>
spinicrus at gmail dot com
15-Oct-2006 02:58
15-Oct-2006 02:58
if you want to get the position of a substring relative to a substring of your string, BUT in REVERSE way:
<?php
function strpos_reverse_way($string,$charToFind,$relativeChar) {
//
$relativePos = strpos($string,$relativeChar);
$searchPos = $relativePos;
$searchChar = '';
//
while ($searchChar != $charToFind) {
$newPos = $searchPos-1;
$searchChar = substr($string,$newPos,strlen($charToFind));
$searchPos = $newPos;
}
//
if (!empty($searchChar)) {
//
return $searchPos;
return TRUE;
}
else {
return FALSE;
}
//
}
?>
admin at xylotspace dot com
27-Sep-2006 11:33
27-Sep-2006 11:33
Yay! I came up with a very useful function. This finds a beginning marker and an ending marker (the first after the beginning marker), and returns the contents between them. You specify an initial position in order to tell it where to start looking. You can use a while() or for() loop to get all occurence of a certain string within a string (for example, taking all hyperlinks in a string of HTML code)...
function get_middle($source, $beginning, $ending, $init_pos) {
$beginning_pos = strpos($source, $beginning, $init_pos);
$middle_pos = $beginning_pos + strlen($beginning);
$ending_pos = strpos($source, $ending, $beginning_pos + 1);
$middle = substr($source, $middle_pos, $ending_pos - $middle_pos);
return $middle;
}
For example, to find the URL of the very first hyperlink in an HTML string $data, use:
$first_url = get_middle($data, '<a href="', '"', 0);
It's done wonders for scraping HTML pages with certain tools on my website.
banana dot meal at gmail dot com
25-Aug-2006 10:07
25-Aug-2006 10:07
To thepsion5 at hotmail dot com:
Please mind the warning part of the documentation!
Your function won't work on $Haystack s starting with $needle.
Here's a solution for that:
<?
function findAllOccurences($Haystack, $needle, $limit=0)
{
$Positions = array();
$currentOffset = 0;
$count=0;
while(($pos = strpos($Haystack, $needle, $offset))!==false && ($count < $limit || $limit == 0))
{
$Positions[] = $pos;
$offset = $pos + strlen($needle);
$count++;
}
return $Positions;
}
?>
spam at robkohr dot com
11-Aug-2006 04:38
11-Aug-2006 04:38
Simple function to determine if a needle occurs in a haystack
function is_substr($needle, $haystack){
$pos = strpos($haystack, $needle);
if ($pos === false) {
return false;
} else {
return true;
}
}
thepsion5 at hotmail dot com
08-Aug-2006 02:57
08-Aug-2006 02:57
I created this little function based on the one posted by chasesan at gmail dot com; It find all occurences of a string within another string and returns their positions as an array:
<?PHP
function findAllOccurences($Haystack, $needle, $limit=0)
{
$Positions = array();
$currentOffset = 0;
$count=0;
while(($pos = strpos($Haystack, $needle, $offset)) && ($count < $limit || $limit == 0))
{
$Positions[] = $pos;
$offset = $pos + strlen($needle);
$count++;
}
return $Positions;
}
?>
I hope this helps someone :)
wolfeym38 at yahoo dot com
25-Jul-2006 03:24
25-Jul-2006 03:24
I finally figured out how to use this function correctly (and efficiently) if you want to test for a needle that may start at the beginning of haystack, simply use
if (strpos($haystack, $needle) === 0)) {
do stuff here..
}
someone else mentioned that you needed to assign a variable first and test to make sure that it was === true first.. That is not needed
wormss at wormss dot net
19-Jul-2006 09:26
19-Jul-2006 09:26
Im sure there are more efficient methods of this, but i use this alot when dealing with rss and was proud of it.
<?
function data_from_element($needle,$haystack,$tags=FALSE) { // Expects two Strings, returns Array
$needle_start = "<".$needle.">"; $needle_end = "</".$needle.">";
$array = array(); $pos_start = 0;
while(($pos_start = strpos($haystack,$needle_start,$pos_start)) !== false) {
$pos_end = strpos($haystack,$needle_end,$pos_start);
if($tags) $array[] = substr($haystack,$pos_start,$pos_end-$pos_start+strlen($needle_end));
else $array[] = substr($haystack,$pos_start + strlen($needle_start),$pos_end - $pos_start - strlen($needle_start));
$pos_start++;
}
return $array;
}
d
//example
$rss = '<?xml version="1.0"?> <rss version="2.0"> <channel> <title>Example RSS</title> <description>Example RSS Description</description> <link>http://example.com/rss/</link> <item> <title>Example RSS 1</title> <link>http://example.com/rss/1.html</link> <description>Example 1</description> </item> <item> <title>Example RSS 2</title> <link>http://example.com/rss/2.html</link> <description>Example 2</description> </item> </channel> </rss>';
$items = data_from_elements(link,$rss); // $rss[0] => "http://example.com/rss/"
$items = data_from_elements(link,$rss,true); // $rss[0] => "<link> http://example.com/rss/ </link>"
?>
chasesan at gmail dot com
12-Jul-2006 07:48
12-Jul-2006 07:48
You can use strpos to produce a funciton that will find the nth instance of a certain string within a string. Personally I find this function almost more useful then strpos itself.
I kinda wish they would put it stock into php but I doupt thats gonna happen any time soon. ^_^
Here is da code:
<?php
//just like strpos, but it returns the position of the nth instance of the needle (yay!)
function strpos2($haystack, $needle, $nth = 1)
{
//Fixes a null return if the position is at the beginning of input
//It also changes all input to that of a string ^.~
$haystack = ' '.$haystack;
if (!strpos($haystack, $needle))
return false;
$offset=0;
for($i = 1; $i < $nth; $i++)
$offset = strpos($haystack, $needle, $offset) + 1;
return strpos($haystack, $needle, $offset) - 1;
}
?>
steve at webcommons dot biz
06-Jul-2006 03:56
06-Jul-2006 03:56
If you're wanting a simple "strpos" using a pattern and don't need the complexity of multi_strpos below, this function (for PHP 4.3.0+) returns the regex position.
function preg_pos($sPattern, $sSubject, &$FoundString, $iOffset = 0) {
$FoundString = NULL;
if (preg_match($sPattern, $sSubject, $aMatches, PREG_OFFSET_CAPTURE, $iOffset) > 0) {
$FoundString = $aMatches[0][0];
return $aMatches[0][1];
}
else {
return FALSE;
}
}
It also returns the actual string found using the pattern, via $FoundString.
ludvig dot ericson at gmail dot com
28-Apr-2006 05:28
28-Apr-2006 05:28
As a simplified way of doing what the poster below did:
<?php
$firstName .= '\'';
if (!preg_match('/[sx]$/', $firstName)) {
$firstName .= 's';
}
?>
If you feel using a regular expression is too much, try it - I've not tested yet, but I'd say preg_match() is faster then two strpos() calls.
leibwaechter at web dot de
23-Mar-2006 06:26
23-Mar-2006 06:26
If you only want to look, if a string appears in another string - even at position 0 - , you can also use substr_count():
<?php
$mystring = "Hello Chris";
if (substr_count($mystring, "Hello") == 0)
echo "no";
// same as:
if (strpos($mystring, "Hello") === false)
echo "no";
?>
arachnion at gmail dot com
05-Mar-2006 03:17
05-Mar-2006 03:17
<?php
//use a string as needle, even in PHP 4
//works the same like strrpos()
function stringrpos( $sHaystack, $sNeedle )
{
$i = strlen( $sHaystack );
while ( substr( $sHaystack, $i, strlen( $sNeedle ) ) != $sNeedle )
{
$i--;
if ( $i < 0 )
{
return false;
}
}
return $i;
}
?>
18-Feb-2006 08:48
this works fine:
function getCurrentBrowser() {
$browser = $_SERVER['HTTP_USER_AGENT'];
if (strpos(strtoupper($browser), 'MSIE') !== false) {
return "Internet Explorer";
} else if (strpos(strtoupper($browser), 'FIREFOX') !== false) {
return "Firefox";
} else if (strpos(strtoupper($browser), 'KONQUEROR') !== false) {
return "Konqueror";
} else if (strpos(strtoupper($browser), "LYNX") !== false) {
return "Lynx";
} else {
return $browser;