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@ 2013-07-29T06:40:52Z

<?php

echo 'null == false? ', (null == false) ? 'yes' : 'no', '<br />';
echo 'null == 0?', (null == 0) ? 'yes' : 'no', '<br />';
echo 'null == "0"?', (null == "0") ? 'yes' : 'no', '<br />';
echo 'null == $undefined?', (null == $undefined) ? 'yes' : 'no', '<br />';
echo 'null == ""?', (null == "") ? 'yes' : 'no', '<br />';

echo 'false == 0?', (false == 0) ? 'yes' : 'no', '<br />';
echo 'false == "0"?', (false == "0") ? 'yes' : 'no', '<br />';
echo 'false == $undefined?', (false == $undefined) ? 'yes' : 'no', '<br />';
echo 'false == ""?', (false == "") ? 'yes' : 'no', '<br />';

echo '0 == "0"?', (0 == "0") ? 'yes' : 'no', '<br />';
echo '0 == $undefined?', (0 == $undefined) ? 'yes' : 'no', '<br />';
echo '0 == ""?', (0 == "") ? 'yes' : 'no', '<br />';

echo '"0" == $undefined?', ("0" == $undefined) ? 'yes' : 'no', '<br />';
echo '"0" == ""?', ("0" == "") ? 'yes' : 'no', '<br />';

echo '$undefined == ""?', ($undefined == "") ? 'yes' : 'no', '<br />';

Output for git.master, git.master_jit, rfc.property-hooks: null == false? yes<br />null == 0?yes<br />null == "0"?no<br />null == $undefined? Warning: Undefined variable $undefined in /in/5Y6uX on line 6 yes<br />null == ""?yes<br />false == 0?yes<br />false == "0"?yes<br />false == $undefined? Warning: Undefined variable $undefined in /in/5Y6uX on line 11 yes<br />false == ""?yes<br />0 == "0"?yes<br />0 == $undefined? Warning: Undefined variable $undefined in /in/5Y6uX on line 15 yes<br />0 == ""?no<br />"0" == $undefined? Warning: Undefined variable $undefined in /in/5Y6uX on line 18 no<br />"0" == ""?no<br />$undefined == ""? Warning: Undefined variable $undefined in /in/5Y6uX on line 21 yes<br />

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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