array_search

(PHP 4 = 4.0.5)

array_search -- Searches the array for a given value and returns the corresponding key if successful

Description

mixed array_search ( mixed needle, array haystack [, bool strict])

Searches haystack for needle and returns the key if it is found in the array, FALSE otherwise.

注: Prior to PHP 4.2.0, array_search() returns NULL on failure instead of FALSE.

If the optional third parameter strict is set to TRUE then the array_search() will also check the types of the needle in the haystack.

警告

這個函數可能 回傳布林值FALSE,但也可能回傳一個同於FALSE的非布林值 ,像是0或 ""。請參考Booleans此節有更多資訊。 使用 === 運算子來測試這個函數的回傳值。

See also array_keys() and in_array().