Search an array for the value “red” and return its associated key.
| <?php $a=array(“a”=>“red”,“b”=>“green”,“c”=>“blue”); echo array_search(“red”,$a); ?> |
The array_search() function searches an array for a value and returns the corresponding key.
| array_search(value, array, strict) |
|
Parameter |
Description |
|
value |
Required. Specifies the value to search for. |
|
array |
Required. Specifies the array to search. |
|
strict |
Optional. If set to TRUE, the function will search for identical elements in the array. Possible values are:
When set to true, the number 5 is not considered the same as the string “5” (see example 2). |
|
Return Value: |
Returns the key of a value if found in the array, or |
|
PHP Version: |
4.0.5+ |
|
PHP Changelog: |
This function returns NULL if invalid parameters are passed, which applies to all PHP functions from PHP 5.3.0 onwards.
In PHP 4.2.0 and earlier, this function returns FALSE on failure instead of NULL. |
Search an array for the value 5 and return its key (note the use of quotation marks for the value).
| <?php $a=array(“a”=>“5”,“b”=>5,“c”=>“5”); echo array_search(5,$a,true); ?> |