php key() function
Translation results：
UK[ki:] US[ki]
n.Key; (of a typewriter, etc.) key; key, clue, secret; (of music) key
vt.Type; Lock; adjust the tone of...; provide clues
vi. Use keys
adj. Critical; main
Third person singular: keys Plural: keys Present participle: keying past tense: keyed past participle: keyed
php key() functionsyntax
Function: Returns the key name of the element currently pointed to by the internal pointer of the array.
Syntax: key(array)
Parameters:
| Parameter | Description |
| array | Required. Specifies the array to use. |
Description: Returns the key name of the element currently pointed to by the internal pointer of the array. If an error occurs, the function returns FALSE.
php key() functionexample
<?php
$people = array("西门", "灭绝", "无忌");
echo "键的当前位置是：" . key($people);
?>Run instance»
Click the "Run instance" button to view the online instance
Output:
键的当前位置是：0
<?php
$arr = array("西门", "灭绝", "无忌");
$arr2 = next($arr); //指向下一个元素 灭绝
echo key($arr); //输出灭绝的 key值
?>Run Instance»
Click the "Run Instance" button to view the online instance
Output:
1
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