Aarray built in functions in php. Hello Programmers, In this tutorial, I will discuss with you a PHP built in function which is in_array().

The PHP in_array() function is a built-in function. in_array() function checks if a value exists or not in a array. It returns TRUE if the given items are found in the given array, and returns FALSE otherwise.

PHP in_array() Syntax

The PHP in_array() function syntax is in_array(search, array, type)

search: Required. Specifies what to search for

array: Required. it specifies the array in which we want to search.

type : Optional. If this parameter is set to TRUE, the in_array() function searches for the search-string and specific type in the array.

Example : 

  $items = array("Mobile", "TV", "Camera", "iPhone");

  return (in_array("iPhone", $items))
      
         ? "Yes" : "Not";
         

Output: Yes

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More Example of PHP array (in_array) function :

$image = $_FILES['image']['name'];
        $permit = array('png','jpg','jpeg');
        $ext = explode('.',$image);
        $ext = strtolower(end($ext));
        if(in_array($ext,$permit) === false){
            echo "EXT_NOT_MATCH";
            exit();
        }else{
       //go for next request
}

Reference:
http://php.net/manual/en/function.in-array.php

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Hope it can help you.