(PHP 4, PHP 5, PHP 7)
key — 锟接癸拷锟斤拷锟斤拷锟斤拷锟斤拷取锟矫硷拷锟斤拷
array锟斤拷锟斤拷锟介。
key() 锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟节诧拷指锟斤拷指锟斤拷牡锟角帮拷锟皆拷募锟斤拷锟斤拷锟�
锟斤拷锟斤拷锟斤拷锟斤拷锟狡讹拷指锟诫。锟斤拷锟斤拷诓锟街革拷氤拷锟斤拷锟皆拷锟斤拷斜锟轿诧拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷强盏模锟�key() 锟结返锟斤拷 NULL锟斤拷
| 锟芥本 | 说锟斤拷 |
|---|---|
| 7.0.0 |
array 锟斤拷锟斤拷锟斤拷锟角会传值锟斤拷
锟节达拷之前锟斤拷锟斤拷锟结尽锟斤拷锟杰达拷锟斤拷锟矫ｏ拷锟斤拷锟斤拷痛锟街碉拷锟�
|
Example #1 key() 锟斤拷锟斤拷
<?php
$array = array(
'fruit1' => 'apple',
'fruit2' => 'orange',
'fruit3' => 'grape',
'fruit4' => 'apple',
'fruit5' => 'apple');
// this cycle echoes all associative array
// key where value equals "apple"
while ($fruit_name = current($array)) {
if ($fruit_name == 'apple') {
echo key($array).'<br />';
}
next($array);
}
?>
锟斤拷锟斤拷锟斤拷锟教伙拷锟斤拷锟斤拷锟�
fruit1<br /> fruit4<br /> fruit5<br />