php array_search() function usage_PHP tutorial-PHP Tutorial-php.cn

php array_search() function usage_PHP tutorial

WBOY

Release： 2016-07-21 15:39:22

Original

1021 people have browsed it

Definition and usage

The array_search() function is the same as in_array(), searching for a key value in the 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.

Grammar

array_search(value,array,strict)

Copy after login

Parameters

Description

value

Required. Specifies the value to search for in the array.

array

Required. The array to be searched.

strict

参数

描述

value

必需。规定在数组中搜索的值。

array

必需。被搜索的数组。

strict

可选。可能的值：

true
false - 默认

如果值设置为 true，还将在数组中检查给定值的类型。（参见例子 2）

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() ExampleCopy 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 value equal to FALSE Non-Boolean value, 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 code

 The code is as follows:

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

echo array_search("Dog",$a);
?>

Output: a

Example 2

Copy code

 The code is as follows:

$a=array("a"=>"5","b"=>5,"c"=>"5");

echo array_search(5,$a,true);
?>

Output:

Definition and usage The array_search() function is the same as in_array(), searching for a key value in the array. If the value is found, the key of the matching element is returned. If not found, return...