Online PHP editor | rfc for BtlNt

@ 2013-09-16T08:09:55Z

<?php
#ob_start();

echo '#+++++++++++++++++++++++++++++++++++#' . PHP_EOL;
echo '# Checking if a constant is defined #' . PHP_EOL;
echo '# always retuns (bool)false in PHP. #' . PHP_EOL;
echo '# Even if it has been defined!      #' . PHP_EOL;
echo '#+++++++++++++++++++++++++++++++++++#' . PHP_EOL;

error_reporting(E_ALL);

echo 'Testing on PHP version ' . PHP_VERSION . PHP_EOL . PHP_EOL;
#ob_flush(); flush(); sleep(1);

echo 'Checking if `__DIR__` is defined...' . PHP_EOL;
if (!defined('__DIR__')) {
	#ob_flush(); flush(); sleep(2);
	
	echo 'Nope, `defined()` returned `(bool)false`.' . PHP_EOL;
	echo 'So, seems like the magic constant `__DIR__` is not defined.' . PHP_EOL . PHP_EOL;
	#ob_flush(); flush(); sleep(2);
	
	echo 'No prob. Executing `define(\'__DIR__\', \'/foo/bar\')`...' . PHP_EOL;
	define('__DIR__', '/foo/bar');
	#ob_flush(); flush(); sleep(1);

	echo 'Done, defined `__DIR__` as "/foo/bar".' . PHP_EOL . PHP_EOL;
	#ob_flush(); flush(); sleep(1);
	
	echo 'Double-checking `__DIR__` is defined now...' . PHP_EOL;
	#ob_flush(); flush(); sleep(2);
	
	if (!defined('__DIR__')) {		
		echo 'WTF, `defined(\'__DIR__\')` again returned `(bool)false`?!' . PHP_EOL;
	} else{
		echo 'Strike, this time `defined(\'__DIR__\')` returned `(bool)true`.' . PHP_EOL;
		echo 'So, seems like `__DIR__` was successfully defined. :)' . PHP_EOL . PHP_EOL;
	}
} else{
	echo 'Yep, `defined(\'__DIR__\')` returned `(bool)true`.' . PHP_EOL;
	echo 'The magic constant `__DIR__` seems to be defined.' . PHP_EOL . PHP_EOL;
}
#ob_flush(); flush(); sleep(2);

echo 'Finally, here is the result of `var_dump(__DIR__)`:' . PHP_EOL;
var_dump(__DIR__);
#ob_flush(); flush(); sleep(1);

if ("/foo/bar" != __DIR__) {
	echo 'But, wait..' . PHP_EOL;
	echo 'I defined `__DIR__` as "/foo/bar" - not as "' . __DIR__ .'"?! What happend?' . PHP_EOL . PHP_EOL;
	#ob_flush(); flush(); sleep(1);
	
	echo 'In fact, `__DIR__` was already defined when first checked.' . PHP_EOL;
	echo 'But 1) `defined(\'__MAGIC_CONSTANT__\')` ALWAYS returns `(bool)false`' . PHP_EOL;
	echo 'and 2) defined constants can not be overwritten.' . PHP_EOL;
}

Output for git.master, git.master_jit, rfc.property-hooks: #+++++++++++++++++++++++++++++++++++# # Checking if a constant is defined # # always retuns (bool)false in PHP. # # Even if it has been defined! # #+++++++++++++++++++++++++++++++++++# Testing on PHP version 8.3.0-dev Checking if `__DIR__` is defined... Nope, `defined()` returned `(bool)false`. So, seems like the magic constant `__DIR__` is not defined. No prob. Executing `define('__DIR__', '/foo/bar')`... Done, defined `__DIR__` as "/foo/bar". Double-checking `__DIR__` is defined now... Strike, this time `defined('__DIR__')` returned `(bool)true`. So, seems like `__DIR__` was successfully defined. :) Finally, here is the result of `var_dump(__DIR__)`: string(3) "/in" But, wait.. I defined `__DIR__` as "/foo/bar" - not as "/in"?! What happend? In fact, `__DIR__` was already defined when first checked. But 1) `defined('__MAGIC_CONSTANT__')` ALWAYS returns `(bool)false` and 2) defined constants can not be overwritten.

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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