is_object

(PHP 4, PHP 5, PHP 7, PHP 8)

is_object检测变量是否是一个对象

描述

is_object ( mixed $var ) : bool

如果 var 是一个 object 则返回 true,否则返回 false

参见 is_bool()is_int()is_integer()is_float()is_string()is_array()

User Contributed Notes

wadih at creationmw dot com 29-Jul-2017 06:47
Note that closures return true when passed to is_object():

<?php

echo
   
is_object(
        function(){return
"hello";}
    );

?>

Returns true (1)
shadow_games at abv dot bg 11-Jun-2014 03:42
here i created one function that i wanted to find but i had never found :X

    function compare_two_object_recursive($object_1, $object_2, $object_1_Identifier = false, $object_2_Identifier = false){
        $object1 = (array)$object_1;
        $object2 = (array)$object_2;
        $object3 = array();
       
        $o1i = $object_1_Identifier ? $object_1_Identifier : 1;
        $o2i = $object_2_Identifier ? $object_2_Identifier : 2;
       
        foreach($object1 as $key => $value){
            if(is_object($object1[$key])){
                $object1[$key] = (array)$object1[$key];
                $object2[$key] = (array)$object2[$key];
                $object3[$key] = (object)compare_two_object_recursive($object1[$key], $object2[$key], $o1i, $o2i);
            }elseif(is_array($object1[$key])){
                $object3[$key] = compare_two_object_recursive($object1[$key], $object2[$key], $o1i, $o2i);
            }else{
                if($object1[$key] == $object2[$key]){
                    $object3[$key]['comparison_status'] = "SAME";
                }else{
                    $object3[$key]['comparison_status'] = "NOT THE SAME";
                    $object3[$key][$o1i] = $object1[$key];
                    $object3[$key][$o2i] = $object2[$key];
                }
            }
        }
        return $object3;
    }
mark at not4you dot com 21-Sep-2011 12:23
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;
}
?>
peter dot nagel at portavita dot nl 22-Mar-2011 01:46
Note: is_object(null) returns false

This should actually be part of the input/output specification at the top of this page.
will 20-Mar-2010 02:36
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
ldean at saleamp dot com 01-Sep-2009 07:16
Use instanceof() to check for a specific type.
Senthryl 17-Mar-2009 06:03
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)));
}
?>
gregdangelo at gmail dot com 14-Apr-2008 12:03
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;
}
corychristison[aT-]lavacube(.dot)com 02-Feb-2005 05:06
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.
victor AT fourstones DOT net 01-Jan-2005 03:49
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 01-Jan-2005 07:47
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!
lbjay can be emailed at reallywow dot com 02-May-2003 12:18
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.
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