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Asked: 2026-05-28T22:08:30+00:00

I built a php script to output data posted in a form, but I

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I built a php script to output data posted in a form, but I ran into a problem. The server the website is going to run on, runs PHP 5.1.6. This version of PHP does not support filter_var.

I need to know an alternative on short term (preferably yesterday), and can’t find something straight forward on Google or Stack Overflow.

Mayhap someone here ran into the same issue in the past and has a quick fix for me?

This code:

$email= filter_var($_POST['email'], FILTER_SANITIZE_EMAIL);
$answer= filter_var($_POST['answer'], FILTER_SANITIZE_STRING);

needs to be compatible with PHP 5.1.6, so the email address is checked on genuinity, and that no malicious code is used in either fields. Any tips?

Thanks so much!

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1 Answer

  1. Editorial Team

    for Emails you can use a Regex: (for example: http://www.totallyphp.co.uk/validate-an-email-address-using-regular-expressions)

    for strings you could also do regex, but that is a little bit too heavy, so maybe a combination of mysql_real_escape_string() if you send it to a DB, and for html you should use htmlentities():

    http://de.php.net/manual/en/function.mysql-real-escape-string.php

    http://www.php.net/manual/en/function.htmlentities.php

    I don’t think that the filter_var-function does far different than just using these methods

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