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SplObjectStorage::key

(PHP 5 >= 5.1.0, PHP 7)

SplObjectStorage::keyReturns 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

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