php array_search function usage

Definition and usage

array_search() function is the same as in_array(), searching for a key value in an array. If the value is found, the key of the matching element is returned. If not found, returns false.

Prior to PHP 4.2.0, functions returned null instead of false on failure.

If the third parameter strict is specified as true, the key name of the corresponding element will only be returned if the data type and value are consistent.

Syntax

array_search(value,array,strict)

Parameters	Description
value	Required. Specifies the value to search for in the array.
array	Required. The array to be searched.
strict	Optional. Possible values: true false - Default If the value is set to true, the type of the given value will also be checked in the array. (See Example 2)

Example #1 array_search() Example

Copy code The code is as follows:

$array = array(0 => 'blue', 1 => 'red', 2 => 'green', 3 => 'red');
$key = array_search('green', $array); // $key = 2;
$key = array_search('red', $array); // $key = 1;
?>

Warning
This function may return the Boolean value FALSE, but it may also return a non-Boolean value equivalent to FALSE, such as 0 or"". See the Boolean types chapter for more information. The === operator should be used to test the return value of this function.
Example 1

Copy the code The code is as follows:

$a=array("a"=>"Dog","b"=>"Cat","c" =>"Horse");
echo array_search("Dog",$a);
?>

Output: a
Example 2

Copy the code The code is as follows:

$a=array("a"=>"5","b"=>5,"c"=>"5");
echo array_search(5,$a,true);
? >

Output:
b

The above introduces the use of the php array_search function, including the relevant content. I hope it will be helpful to friends who are interested in PHP tutorials.