PHP Crib Sheet

Snippets

<?php echo ($x++ & 1?'odd':'even') ?>

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Headers and the Like

header("Content-Type: text/html; charset=utf-8");
header("Content-Language: en-US");
header("Cache-Control: public");
header("X-UA-Compatible: IE=edge; chrome=1");
date_default_timezone_set('America/Chicago');

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Headers for Caching Problems

… where the browser is inexplicably caching …

header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
header("Cache-Control: no-store, no-cache, must-revalidate"); // HTTP/1.1
header("Cache-Control: post-check=0, pre-check=0", false);
header("Pragma: no-cache"); // HTTP/1.0
header('Expires: '.gmdate('D, d M Y H:i:s \G\M\T', time() - (60 * 60)));

For more about these, head over to the W3C and check out information from RFC 2616 on Header Field Definitions. The above solution was largely gleaned from Stack Overflow.

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Constants

define('LF',"\n");
define('ROOT',$_SERVER['DOCUMENT_ROOT']);
define('HOST',$_SERVER['SERVER_NAME']);
define('SELF',htmlentities($_SERVER['PHP_SELF']));
define('THIS',htmlentities($_SERVER['SCRIPT_URL']));
define('TSEC',($_SERVER['HTTPS']?'https://':'http://')); // Transfer Security (HTTPS/HTTP)

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$_SERVER Super Globals

$_SERVER['PHP_SELF'] → /reference/language/php.html
$_SERVER['argv'] → Array
$_SERVER['argc'] → 0
$_SERVER['GATEWAY_INTERFACE'] → CGI/1.1
$_SERVER['SERVER_ADDR'] → 74.208.57.152
$_SERVER['SERVER_NAME'] → fun.wd2.us
$_SERVER['SERVER_SOFTWARE'] → Apache
$_SERVER['SERVER_PROTOCOL'] → HTTP/1.1
$_SERVER['REQUEST_METHOD'] → GET
$_SERVER['REQUEST_TIME'] → 1713526405
$_SERVER['REQUEST_TIME_FLOAT'] → 1713526405.8762
$_SERVER['QUERY_STRING'] → 
$_SERVER['DOCUMENT_ROOT'] → [obfuscated]
$_SERVER['HTTP_ACCEPT'] → */*
$_SERVER['HTTP_ACCEPT_CHARSET'] → 
$_SERVER['HTTP_ACCEPT_ENCODING'] → 
$_SERVER['HTTP_ACCEPT_LANGUAGE'] → 
$_SERVER['HTTP_CONNECTION'] → close
$_SERVER['HTTP_HOST'] → fun.wd2.us
$_SERVER['HTTP_REFERER'] → 
$_SERVER['HTTP_USER_AGENT'] → Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
$_SERVER['HTTPS'] → on
$_SERVER['REMOTE_ADDR'] → 18.221.41.214
$_SERVER['REMOTE_HOST'] → 
$_SERVER['REMOTE_PORT'] → 43992
$_SERVER['REMOTE_USER'] → 
$_SERVER['REDIRECT_REMOTE_USER'] → 
$_SERVER['SCRIPT_FILENAME'] → [obfuscated]
$_SERVER['SERVER_ADMIN'] → webmaster@fun.wd2.us
$_SERVER['SERVER_PORT'] → 443
$_SERVER['SERVER_SIGNATURE'] → 
$_SERVER['PATH_TRANSLATED'] → 
$_SERVER['SCRIPT_NAME'] → /reference/language/php.html
$_SERVER['SCRIPT_URL'] → 
// $_SERVER['SCRIPT_URL'] is only available with mod_rewrite.
$_SERVER['SCRIPT_URI'] → 
// $_SERVER['SCRIPT_URI'] is only available with mod_rewrite.
$_SERVER['REQUEST_URI'] → /reference/language/php.html
$_SERVER['PHP_AUTH_DIGEST'] → 
$_SERVER['PHP_AUTH_USER'] → 
$_SERVER['PHP_AUTH_PW'] → 
$_SERVER['AUTH_TYPE'] → 
$_SERVER['PATH_INFO'] → 
$_SERVER['ORIG_PATH_INFO'] → /reference/language/php.html

Magic Constants

__LINE__ → 124
__FILE__ → [obfuscated - shows server-side path and file name]
__DIR__ → [obfuscated - shows server-side path]
__FUNCTION__ → 
__CLASS__ → 
__TRAIT__ → 
__METHOD__ → 
__NAMESPACE__ →