Basic PHP Security

input-validator.php

<?php
// Input must be a number
if(is_numeric($input)){
echo 'Input is a number';
} else {
echo 'Input is not a number';
}

// Input can only contain numbers and letters.
if(preg_match('/([^A-z0-9])/', $input)){
echo 'Input does not contain only numbers and letters.';
} else {
echo 'Input contains only numbers and letters.';
}

// Input must be an email
if(preg_match('/^([a-zA-Z0-9])+@([a-zA-Z0-9_-])+(.[a-zA-Z0-9_-]+)+/', $input)){
echo 'Email Is Valid.';
} else {
echo 'Email Is Invalid.';
}
?>

sessions.php

<?php
session_start(); // Start the session. Always put this at the top of your html.

// Set some sessions
$_SESSION['name'] = 'Example 1';

// echo session data
echo $_SESSION['name'];
// Would return Example 1
?>