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Strings in PHP

  1. PHP String Interpolation, Using Variables in Strings
    How to effectively use variables within strings to insert bits of data where needed.
  2. Complex (curly) Syntax in PHP
    A tutorial on using complex curly syntax to access arrays and objects in strings.
  3. 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.
  4. Check if String Begins With String in PHP
    How to check if a string begins with another string.
  5. Count the Number of Characters in a String in PHP
    How to count the number of characters in a multi-byte string using PHP.
  6. 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.
  7. 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.
  8. Check if string contains a substring with PHP
    Check if a string contains a substring using strpos and regular expressions.
  9. A Grep Equivalent in PHP
    This shows how to do a grep-like action using regular expressions from a PHP script.
  10. Splitting strings into arrays
    How to break down strings into smaller parts using PHP.