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PHP RegEx

PHP includes function to work effectivly with strings by using regular expressions, this category is dedicated to documenting the use of these functions.

  1. Validating user input, to prevent injection attacks in PHP
    Validating user-input is one of the most important ways to increase security and prevent hacks; in this article, I will show how to easily validate GET and POST parameters, and prevent your app from being abused to send spam.
  2. Auto-Include Width and Height on Img Elements With PHP
    How to optimize image-loading and automatically include width and height attributes on img elements with PHP.
  3. Beware of preg_replace and Disappearing Backslashes
    Backslashes in replacement string seem to disappear when the replacement is done using preg_replace
  4. Escaping Backslash in PHP
    Backslash needs to be tediously excaped in PHP, both when uccuring inside your PHP script, and when used with preg_replace.
  5. How to replace parts of a string with str_replace and preg_replace
    Tutorial on how to replace parts of a string with str_replace and regular expressions.

PHP Regular Expressions

This category is dedicated to working with regular expressions in PHP through the preg_* functions.