Last Updated: February 25, 2016

[PHP] Easier way to check if form keys exists

This function makes sure that form keys exists before processing.
And also avoids codes such as

$username = isset($POST['username']) ? $POST['username'] : null;
$password = isset($POST['password']) ? $POST['password'] : null;

Usage:

if(form_has_keys($_POST, array('username', 'password')))
{
 // submit data 
}
else
{
 // echo 'Invalid Form Data'; 
}

// Function
 function form_has_keys($aPost, $aKeys = array())
 {
 $iFailed = 0;

 foreach($aKeys as $sKey)
 {
 if(!array_key_exists($sKey, $aPost))
 {
 $iFailed++; 
 }
 }

 return $iFailed > 0 ? false : true;
 }