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<?php
namespace App\Helpers;
class ValidationHelper
{
// makes sure all content is made safe when outputted to screen
static function safeOutputToScreen($input, $allowedChars = null, $length = null) {
if ($allowedChars != null) {
$input = self::removeInvalidCharacters($input, $allowedChars);
}
if ($length != null) {
if (strlen($input) > $length) {
$input = substr($input, 0, $length - 3) . '...';
}
}
$input = htmlspecialchars($input, ENT_QUOTES, "UTF-8");
return $input;
}
// tests for a valid email address and optionally tests for valid MX records, too.
static function validEmail($email) {
return filter_var($email, FILTER_VALIDATE_EMAIL);
}
static function validUsername($username) {
return preg_match('/^[a-zA-Z0-9_]+$/', $username);
}
static function containsInvalidCharacters($input, $allowedChars = 'abcdefghijklmnopqrstuvwxyz 1234567890') {
if (self::removeInvalidCharacters($input, $allowedChars) != $input) {
return true;
}
return false;
}
static function removeInvalidCharacters($input, $allowedChars = 'abcdefghijklmnopqrstuvwxyz 1234567890') {
$str = '';
for ($i = 0; $i < strlen($input); $i++) {
if (!stristr($allowedChars, $input[$i])) {
continue;
}
$str .= $input[$i];
}
return $str;
}
static function validDate($date, $format = 'Y-m-d H:i:s') {
$d = \DateTime::createFromFormat($format, $date);
return $d && $d->format($format) == $date;
}
static function validIPAddress($ipAddress) {
return filter_var($ipAddress, FILTER_VALIDATE_IP);
}
}