is_object
(PHP 4, PHP 5)
is_object — 检测变量是否是一个对象
描述
bool is_object ( mixed $var )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() 和 is_array()。
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PHP is_object 检测变量是否是一个对象
PHP is_object note #1
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;
}
?>PHP is_object note #2
Note: is_object(null) returns false
This should actually be part of the input/output specification at the top of this page.PHP is_object note #3
Just discovered:
is_a ( object $object , string $class_name )
Which checks if the object is of this class or has this class as one of its parents
Which seems to do what a lot here are trying to replicatePHP is_object note #4
Use instanceof() to check for a specific type.PHP is_object note #5
Cleaning it up even more:
<?php
function is_obj(&$object, $className = null, $caseSensitive = true) {
return is_object($object) && (!is_string($className) ||preg_match('/^'.$className.'$/D'.($caseSensitive ? '' : 'i'),get_class($object)));
}
?>PHP is_object note #6
cleaned up peter's code... use only one return statement
function is_obj( &$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 $result;
}PHP is_object note #7
Optimizing the is_obj() from corychristison, and with the "return false" suggested by xixulon.
function is_obj( &$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($check) );
}
} else {
return false;
}
}PHP is_object note #8
Thank you victor AT fourstones DOT net.
I have written a function to do what victor has suggested, with the ease of use of is_object. It can be used to replace is_object(), but has an extra field [$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.PHP is_object note #9
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($this)) != 'c1' )
print("oops ");
else
print("this is ok " );
}
else
{
print("static call ");
}
}
}
test_this();
?>
yields:
---------- run-php ----------
oops
this is ok
static callPHP is_object note #10
You can use is_object($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 />' . " ";
}
else
{
// do something different for procedural method
echo 'this is a procedure call <br />' . " ";
}
}
}
$inst = new mrClass();
$inst->test();
mrClass::test();
?>
This would output:
this is an instance call <br />
this is a procedure call <br />
:-) Happy coding!PHP is_object note #11
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.
来自 http://www.php100.com/cover/php/1069.html普通分类: