PHP array_search () function Use _php tutorial

Definition and usage

The Array_search () function, like In_array (), looks for a key value in the array. If the value is found, the key name of the matching element is returned. Returns False if it is not found.

Before PHP 4.2.0, the function returned null instead of false on failure.

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

Grammar

Array_search (value,array,strict)

Parameters	Description
Value	Necessary. Specifies the value to search for in the array.
Array	Necessary. 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 is also checked in the array. (see Example 2)

Example #1 Array_search () example
Copy CodeThe 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 a Boolean value of false, but it may also return a non-Boolean value equivalent to False, such as 0 or "". See the Boolean Types section for more information. You should use the = = = operator to test the return value of this function.


Example 1
Copy CodeThe code is as follows:
$a =array ("a" = "Dog", "b" = "Cat", "C" and "Horse");
Echo Array_search ("Dog", $a);
?>

Output: A

Example 2
Copy CodeThe code is as follows:
$a =array ("a" = "5", "B" =>5, "c" = "5");
Echo Array_search (5, $a, true);
?>

Output:
B

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