Online PHP editor | rfc for fY96G

@ 2013-07-31T11:58:39Z

<?php

error_reporting( -1 );
#ini_set('display_errors', '1');

set_error_handler('my_error_handler');

$global_last_undefined_variable = false;

function my_error_handler($severity, $message, $filename, $lineno)
{
	global $global_last_undefined_variable;
	if ( $severity == E_NOTICE ) {
		
		if ( preg_match( '/^Undefined variable: (.*?)$/', $message, $matches ) ) {
			$global_last_undefined_variable = $matches[1];
		}
	}
	
	return false;
}

function is_undefined( $var )
{
	global $global_last_undefined_variable;
	$result = $global_last_undefined_variable==$var;
	
	if ( $result )
		$global_last_undefined_variable = false;
	
	return $result;
}

$last_notice = false;

$a = null;
// $b - undefined

if ( $a===null && is_undefined( 'a' ) )
	echo "a is undefined\n";
else
	echo "a is defined\n";

if ( $b===null && is_undefined( 'b' ) )
	echo "b is undefined\n";
else
	echo "b is defined\n";

Output for git.master, git.master_jit, rfc.property-hooks: a is defined Warning: Undefined variable $b in /in/fY96G on line 44 b is defined

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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