Online PHP editor | output 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 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: a is defined Warning: Undefined variable $b in /in/fY96G on line 44 b is defined
Output for 5.0.4 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33: a is defined Notice: Undefined variable: b in /in/fY96G on line 44 b is undefined
Output for 4.3.10 - 4.3.11, 4.4.0 - 4.4.9, 5.0.3: a is defined Notice: Undefined variable: b in /in/fY96G on line 44 b is defined
Output for 5.0.0 - 5.0.2: a is defined Notice: Undefined variable: in /in/fY96G on line 44 b is defined
Output for 4.3.9: a is defined Notice: Undefined variable: � in /in/fY96G on line 44 b is defined
Output for 4.3.8: a is defined Notice: Undefined variable: � in /in/fY96G on line 44 b is defined
Output for 4.3.7: a is defined Notice: Undefined variable: q in /in/fY96G on line 44 b is defined
Output for 4.3.0 - 4.3.6: a is defined b is defined

preferences:dark modelive preview