Check value exists in array php (Seen on http://abhijitpal.in/check-value-exists-in-array-php/)

array_value_exists.php

/* This function check a array value exists in an indexed array or numeric array */
function indexed_in_array($value, $array){
	if (in_array($value, $array))
	{
		return true;
	}
	else
	{
		return false;
	}
}

$people = array("Peter", "Joe", "Glenn", "Cleveland");
if(indexed_in_array("Peter", $people)){
	echo 'array value exists in an indexed array or numeric array';
}else{
	echo 'array value not exists in an indexed array or numeric array';
}

<h2>Check value exists in associative array in PHP</h2>
/* This function check a array value exists in an associative array */
function assoc_in_array($value, $array){
	$fliparray = array_flip($array);
	if (array_key_exists($value,$fliparray))
	{
		return true; 
	}
	else
	{
		return false; 
	}
}

$age = array("0"=>"Peter", "1"=>"Ben", "2"=>"Joe");
if(assoc_in_array("Ben", $age)){
	echo 'array value exists in an associative array';
}else{
	echo 'array value not exists in an associative array';
}

<h2>Check value exists in multi dimensional array in PHP</h2>
/* This function check a array value exists in multi dimensional array */
function multi_in_array($value, $array) 
{ 
    foreach ($array AS $item) 
    { 
        if (!is_array($item)) 
        { 
            if ($item == $value) 
            { 
                return true; 
            } 
            continue; 
        } 

        if (in_array($value, $item)) 
        { 
            return true; 
        } 
        else if (multi_in_array($value, $item)) 
        { 
            return true; 
        } 
    } 
    return false; 
}

	$cars = array(
		array("Volvo",22,18),
		array("BMW",15,13),
		array("Saab",5,2),
		array("Land Rover",17,15)
	);
	if(multi_in_array("BMW", $cars)){
		echo 'array value exists in multi dimensional array';
	}else{
		echo 'array value not exists in multi dimensional array';
	}