is_numeric
Use instanceof() to check for a specific type.
is_object
(PHP 4, PHP 5)
is_object — Determină dacă o variabilă este un obiect
Parametri
- var
-
Variabila ce este evaluată.
Valorile întroarse
Întoarce TRUE dacă var este un object, FALSE în caz contrar.
Exemple
Example #1 Exemplu is_object()
<?php
// Declară o funcţie simplă ce întoarce un tablou
// din obiectul nostru
function get_students($obj)
{
if(!is_object($obj))
{
return(false);
}
return($obj->students);
}
// Declară o nouă instanţă a clasei şi completează
// unele valori
$obj = new stdClass;
$obj->students = Array('Kalle', 'Ross', 'Felipe');
var_dump(get_students(NULL));
var_dump(get_students($obj));
?>
Note
Notă: Această funcţie va întoarce FALSE dacă este utilizată cu un obiect neserializat, unde definiţia clasei nu este prezentă (cu toate că gettype() întoarce object).
Vedeţi de asemenea
- is_bool() - Determină dacă o variablă este un boolean
- is_int() - Determină dacă tipul unei variabile este integer
- is_float() - Determină dacă tipul unei variabile este float
- is_string() - Determină dacă tipul variabilei este string
- is_array() - Determină dacă o variabilă este un array
add a note
User Contributed Notesis_object
Senthryl
17-Mar-2009 02:03
17-Mar-2009 02:03
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($object)));
}
?>
gregdangelo at gmail dot com
14-Apr-2008 07:03
14-Apr-2008 07:03
cleaned up peter's code... use only one return statement
function is_obj( &$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 $result;
}
peter at i-node dot com dot br
20-May-2006 08:03
20-May-2006 08:03
Optimizing the is_obj() from corychristison, and with the "return false" suggested by xixulon.
function is_obj( &$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($check) );
}
} else {
return false;
}
}
corychristison[aT-]lavacube(.dot)com
03-Feb-2005 01:06
03-Feb-2005 01:06
Thank you victor AT fourstones DOT net.
I have written a function to do what victor has suggested, with the ease of use of is_object. It can be used to replace is_object(), but has an extra field [$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 11:49
01-Jan-2005 11:49
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($this)) != 'c1' )
print("oops\n");
else
print("this is ok\n" );
}
else
{
print("static call\n");
}
}
}
test_this();
?>
yields:
---------- run-php ----------
oops
this is ok
static call
corychristison[aT-]lavacube(.dot)com
01-Jan-2005 03:47
01-Jan-2005 03:47
You can use is_object($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 07:18
02-May-2003 07:18
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.