is_numeric
Note: is_object(null) returns false
This should actually be part of the input/output specification at the top of this page.
is_object
(PHP 4, PHP 5)
is_object — 変数がオブジェクトかどうかを検査する
パラメータ
-
var -
評価する変数。
返り値
もし var が object 型 の場合 TRUE、
そうでない場合は FALSE を返します。
例
例1 is_object() の例
<?php
// オブジェクトから配列を返す
// シンプルな関数を宣言します
function get_students($obj)
{
if (!is_object($obj)) {
return false;
}
return $obj->students;
}
// 新しいクラスのインスタンスを宣言し、
// 値を設定します
$obj = new stdClass();
$obj->students = array('Kalle', 'Ross', 'Felipe');
var_dump(get_students(null));
var_dump(get_students($obj));
?>
注意
注意:
クラス定義が存在しない場合に、 シリアライズされていないオブジェクトに対して使用すると ( gettype() は object を返すにもかかわらず) この関数は
FALSEを返します。
参考
- is_bool() - 変数が boolean であるかを調べる
- is_int() - 変数が整数型かどうかを検査する
- is_float() - 変数の型が float かどうか調べる
- is_string() - 変数の型が文字列かどうかを調べる
- is_array() - 変数が配列かどうかを検査する
add a note
User Contributed Notes
is_object - [11 notes]
peter dot nagel at portavita dot nl ¶
2 years ago
corychristison[aT-]lavacube(.dot)com ¶
8 years ago
Thank you victor AT fourstones DOT net.
I have written a function to do what victor has suggested, with the ease of use of is_object. It can be used to replace is_object(), but has an extra field [$check], to compare to a certain name. If $check is left empty, it will just check if &$object is an object.
<?php
function is_obj( &$object, $check=null, $strict=true )
{
if( $check == null && is_object($object) )
{
return true;
}
if( is_object($object) )
{
$object_name = get_class($object);
if( $strict === true )
{
if( $object_name == $check )
{
return true;
}
}
else
{
if( strtolower($object_name) == strtolower($check) )
{
return true;
}
}
}
}
?>
This could probably be cleaned up, but it's spaced out to be easy to read.
lbjay can be emailed at reallywow dot com ¶
10 years ago
I'm not even sure how to articulate this, so I'm going to just include test code. Maybe someone else will someday wonder the same thing.
<?
error_reporting(E_ALL);
class testParent
{
var $child;
function testParent()
{
$this->child = new testChild();
}
}
class testChild
{
function testChild()
{
}
}
$parent = new testParent();
$parent2 = 'foobar';
print join(',', Array(
is_object($parent) ? 'yes' : 'no',
is_object($parent->child) ? 'yes' : 'no',
is_object($parent2) ? 'yes' : 'no',
is_object($parent2->child) ? 'yes' : 'no'
));
?>
This prints "yes,yes,no,no". Basically this shows that you can use is_object to test if the child object is an object without worrying about an error if the parent object isn't an object either.
gregdangelo at gmail dot com ¶
5 years ago
cleaned up peter's code... use only one return statement
function is_obj( &$object, $check=null, $strict=true )
{
$result = false;
if (is_object($object)) {
if ($check == null) {
$result = true;
} else {
$object_name = get_class($object);
$result = ($strict === true)?
( $object_name == $check ):
( strtolower($object_name) == strtolower($check) );
}
}
return $result;
}
mark at not4you dot com ¶
1 year ago
Unserializes data as returned by the standard PHP serialize() function. If the unserialized object is not an array, it will be converted to one, particularily useful if it returns a __PHP_Incomplete_Class.
<?php
/**
*
* @param string $data Serialized data
*
* @return array Unserialized array
*/
function unserialize2array($data) {
$obj = unserialize($data);
if(is_array($obj)) return $obj;
$arr = array();
foreach($obj as $k=>$v) {
$arr[$k] = $v;
}
unset($arr['__PHP_Incomplete_Class_Name']);
return $arr;
}
?>
victor AT fourstones DOT net ¶
8 years ago
er, I don't think that's right, especially if calling from another object instance:
<?
function test_this()
{
$c2 = new C2();
$c2->func();
$c1 = new C1();
$c1->func();
C1::func();
}
class C2
{
function func()
{
C1::func();
}
}
class C1
{
function func()
{
if( isset($this) )
{
if( strtolower(get_class($this)) != 'c1' )
print("oops\n");
else
print("this is ok\n" );
}
else
{
print("static call\n");
}
}
}
test_this();
?>
yields:
---------- run-php ----------
oops
this is ok
static call
corychristison[aT-]lavacube(.dot)com ¶
8 years ago
You can use is_object($this) to detect if the function is being called via instance or procedure.
Example:
<?php
class mrClass {
function test( )
{
if( is_object($this) )
{
// do something for instance method
echo 'this is an instance call <br />' . "\n";
}
else
{
// do something different for procedural method
echo 'this is a procedure call <br />' . "\n";
}
}
}
$inst = new mrClass();
$inst->test();
mrClass::test();
?>
This would output:
this is an instance call <br />
this is a procedure call <br />
:-) Happy coding!
Senthryl ¶
4 years ago
Cleaning it up even more:
<?php
function is_obj(&$object, $className = null, $caseSensitive = true) {
return is_object($object) && (!is_string($className) || preg_match('/^'.$className.'$/D'.($caseSensitive ? '' : 'i'), get_class($object)));
}
?>
will ¶
3 years ago
Just discovered:
is_a ( object $object , string $class_name )
Which checks if the object is of this class or has this class as one of its parents
Which seems to do what a lot here are trying to replicate
peter at i-node dot com dot br ¶
7 years ago
Optimizing the is_obj() from corychristison, and with the "return false" suggested by xixulon.
function is_obj( &$object, $check=null, $strict=true )
{
if (is_object($object)) {
if ($check == null) {
return true;
} else {
$object_name = get_class($object);
return ($strict === true)?
( $object_name == $check ):
( strtolower($object_name) == strtolower($check) );
}
} else {
return false;
}
}