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(PHP 5 >= 5.3.0)
SplObjectStorage::offsetExists — Checks whether an object exists in the storage
$object
)Checks whether an object exists in the storage.
Note:
SplObjectStorage::offsetExists() is an alias of SplObjectStorage::contains() .
object
The object to look for.
Returns TRUE
if the object exists in the storage,
and FALSE
otherwise.
Example #1 SplObjectStorage::offsetExists() example
<?php
$s = new SplObjectStorage ;
$o1 = new StdClass ;
$o2 = new StdClass ;
$s -> attach ( $o1 );
var_dump ( $s -> offsetExists ( $o1 )); // Similar to isset($s[$o1])
var_dump ( $s -> offsetExists ( $o2 )); // Similar to isset($s[$o2])
?>
以上例程的输出类似于:
bool(true) bool(false)