PHP in array

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PHP: in_array() function

PHP: Checks if a value exists in an array

The in_array() function is used to check whether a value exists in an array or not.

Note: Searches haystack for needle using loose comparison unless strict is set.

Version

(PHP 4 and above)

Syntax

in_array(search_value, array_name, mode) 

Parameters

Name

Description

Required /
Optional

Type

search_value

Value to search in the array.

Required

Mixed*

array_name

Specifies the array to search.

Required

Array

mode

If it is set to true, the function checks the type of the search_value.

Optional

Boolean

*Mixed : Mixed indicates that a parameter may accept multiple (but not necessarily all) types.

Return value

TRUE if search_value is found in array_name, FALSE otherwise.

Value Type :

Boolean.

Example :

  1. $number_list =  array('16.10', '22.0', '33.45', '45.45');  

  2. if (in_array(22.0, $number_list))  

  3. {  

  4. echo "'22.0' found in the array";  

  5. }  

  6. ?>  

Output :

'22.0' found in the array