PHP searches the array for a given simple instance Array_search function, array array_search_php tutorial

PHP searches the array for a given simple instance of the Array_search function, array array_search

Array_search ()

The PHP Array_search () function is used to search the array for the given value, and if successful returns the corresponding key name, otherwise FALSE.

Grammar:

Mixed Array_search (mixed needle, array array [, BOOL strict]) parameter description:

Parameters	Description
Needle	The value that needs to be searched in the array, if it is a string, is case-sensitive
Array	The array to retrieve
Strict	Optional, if set to TRUE, the value types in the needle and array are also checked

Because the index array may have a starting index number of 0, the function may also return a non-Boolean value equivalent to FALSE, such as 0 or "", so you need to use the = = = operator to rigorously validate the value returned by the function.

Example:

<?php$arr_a = Array (0 = "a", 1 = "B", 2 = "C"), $key = Array_search ("A", $arr _a), if ($key!== FALSE) {  E Cho "Key name: $key";} else {  echo ' no match result ';}? >

The example output is as follows:

Key Name: 0 if needle occurs more than once in an array, the first matching key is returned. To return all keys that match a value, use the Array_keys () function.

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