How do I check if array value is empty?

Question

Here is my array ouput

Array
(
    [1] => 1
    [2] => 2
    [3] =>  
)

How do I know the [3] => is empty?

Answer 1

Try this:

<?php
    $data=array(
        'title' => 'Test Name Four',
        'first_name' => '',
        'last_name' => 'M',
        'field_company' => 'ABC',
        'email' => '',
        'client_phone_number' => '',
        'address_line_1' => '',
        'address_line_2' => 'Address 3',
        'address_line_3' => '',
        'address_line_4' => '',
        'post_code' => '',
        );
    echo '<pre>';
    print_r($data);
    foreach ($data as $key => $case ) { 
        echo "$key => ".is_multiArrayEmpty($case)."<br>"; 
    }
    function is_multiArrayEmpty($multiarray) { 
        if(is_array($multiarray) and !empty($multiarray)){ 
            $tmp = array_shift($multiarray); 
                if(!is_multiArrayEmpty($multiarray) or !is_multiArrayEmpty($tmp)){ 
                    return false; 
                } 
                return true; 
        } 
        if(empty($multiarray)){ 
            return true; 
        } 
        return false; 
    } 
?>

Answer 2

im using in my project like this for check this array

im posting form data like this array('username' => 'john','surname' => 'sins');

public function checkArrayKeyExist($arr) {
    foreach ($arr as $key => $value) {
        if (!strlen($arr[$key])) {
            return false;
        }
    }
    return true;
}