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PHP Cheat Sheet

Basic Debugging

Value Dumping

print_r($someArray);      # Print flat arrays
var_dump($var);           # Nested printing of arbitrary structures

Handling Exceptions

To catch exceptions do

try {
    # do something
} catch(Exception $e) {
    print "$e\n";

As not all of PHP and its libraries do consistenly throw real exceptions you might want to convert runtime errors (that would otherwise terminate the code execution) into catchable exceptions:

set_error_handler(function($errno, $errstr, $errfile, $errline ){
    throw new ErrorException($errstr, $errno, 0, $errfile, $errline);

Regular Expressings

  • For details check <?add topic=’PHP preg_match’?> and <?add topic=’PHP preg_replace’?>
  • PHP - strpos vs. preg_match: In-depth comparison of PHP string operation methods (strpos, strstr, stripos) with different PHP5 interpreters and compared to the C equivalents.
  • PHP - Named Capture Groups: As PHP uses PCRE it also supports named capture groups:

      preg_match("/(?P\d{4})-(?P\d{2})-(?P\d{2})/", "2012-10-20")


PHP Security and Hardening