Question

How to check if key exists in array in PHP

Answer 1

$arr = array('name' => "Avi", 'age' => 48, 'profession' => "Programmer");
if (array_key_exists('name', $arr)) 
    echo "The 'name' element exist";
 
/*
run:

The 'name' element exist

*/

70+ SQL courses for beginners and professionals

Answer 2

$arr = array('first_name' => "Avi", 
             'last_name' => "Bootz", 
             'age' => 48, 
             'profession' => "Programmer");
 
// check if many keys exists
function array_multi_key_exists($keys, $search_arr)
{
    $arr_keys = explode(':', $keys);
    foreach($arr_keys as $key)
        if(!array_key_exists($key, $search_arr))
            return false;
     
    return true;
}
 
if (array_multi_key_exists('first_name:last_name:profession', $arr))
    echo "exist"; // exist
else
    echo "NOT exit";
echo "<br>";
if (array_multi_key_exists('first_name:address', $arr))
    echo "exist";
else
    echo "NOT exit"; // NOT exit
 
/*
run:

exist
NOT exit

*/

70+ SQL courses for beginners and professionals