SplObjectStorage::key

(PHP 5 >= 5.1.0)

SplObjectStorage::key — Returns the index at which the iterator currently is

说明

public int SplObjectStorage::key ( void )

Returns the index at which the iterator currently is.

参数

此函数没有参数。

返回值

The index corresponding to the position of the iterator.

范例

Example #1 SplObjectStorage::key() example

  <?php
$s  = new  SplObjectStorage ();

 $o1  = new  StdClass ;
 $o2  = new  StdClass ;

 $s -> attach ( $o1 ,  "d1" );
 $s -> attach ( $o2 ,  "d2" );

 $s -> rewind ();
while( $s -> valid ()) {
     $index   =  $s -> key ();
     $object  =  $s -> current ();  // similar to current($s)

     var_dump ( $index );
     var_dump ( $object );
     $s -> next ();
}
 ?>

以上例程的输出类似于：

int(0)
object(stdClass)#2 (0) {
}
int(1)
object(stdClass)#3 (0) {
}

参见

SplObjectStorage::rewind() - Rewind the iterator to the first storage element
SplObjectStorage::current() - Returns the current storage entry
SplObjectStorage::next() - Move to the next entry
SplObjectStorage::valid() - Returns if the current iterator entry is valid