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Last updated: Fri, 26 Jan 2007

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# is_object

(PHP 3, PHP 4, PHP 5)

is_object -- Finds whether a variable is an object

## Описание

bool is_object ( mixed var )

Finds whether the given variable is an object.

## Список параметров

`var`

  The variable being evaluated.

## Возвращаемые значения

Returns `TRUE` if `var` is an object, `FALSE` otherwise.

## Примечания

> Замечание: This function will return `FALSE` if used on an unserialized object where the class definition is not present (even though gettype() returns object).

## Смотрите также

is_bool()
is_int()
is_float()
is_string()
is_array()

add a note User Contributed Notes
is_object
peter at i-node dot com dot br
20-May-2006 01:03
`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($check) );
}
} else {
return false;
}
}`
xixulon at gralgrathor dot nl
07-Jul-2005 04:30
`(addendum to function below: for clarity, don't forget to return false;)`
corychristison[aT-]lavacube(.dot)com
02-Feb-2005 05:06
`Thank you victor AT fourstones DOT net.
I have written a function to do what victor has suggested, with the ease of use of is_object. It can be used to replace is_object(), but has an extra field [$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.`
add a note
is_real is_numeric

Last updated: Fri, 26 Jan 2007
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