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() function syntax
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() function example
<?php
$people = array("西門", "滅絕", "無忌");
echo "鍵的當(dāng)前位置是：" . key($people);
?>Run instance?
Click the "Run instance" button to view the online instance
Output:
鍵的當(dāng)前位置是：0
<?php
$arr = array("西門", "滅絕", "無忌");
$arr2 = next($arr); //指向下一個(gè)元素 滅絕
echo key($arr); //輸出滅絕的 key值
?>Run Instance?
Click the "Run Instance" button to view the online instance
Output:
1