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@ 2014-10-10T08:59:41Z

<?php
$whitespace = array(
	"\u0009" => 'character tab',
	"\u000a" => 'line feed',
	"\u000b" => 'line tab',
	"\u000c" => 'form feed',
	"\u000d" => 'carriage return',
	"\u0020" => 'space',
	"\u0085" => 'next line',
	"\u00A0" => 'non-breaking space',
	"\u1680" => 'ogham space',
	"\u2000" => 'en quad',
	"\u2001" => 'em quad',
	"\u2002" => 'en space',
	"\u2003" => 'em space',
	"\u2004" => 'three-per-em space',
	"\u2005" => 'four-per-em space',
	"\u2006" => 'six-per-em space',
	"\u2007" => 'figure space',
	"\u2008" => 'punctuation space',
	"\u2009" => 'thin space',
	"\u200a" => 'hair space',
	"\u2028" => 'line separator',
	"\u2029" => 'paragraph separator',
	"\u202f" => 'narrow non-breaking space',
	"\u205f" => 'medium mathematical space',
	"\u3000" => 'ideographic space'
);

foreach ($whitespace as $char => $name) {
	$dec = json_decode('"'.$char.'"');
	$test = "a{$dec}b";
	$test = preg_replace('/\s+/', '', $test);
	//echo "$name: a{$char}b == $test\n";
	if ($test != "ab") {
		echo "$char ($name) is not matched as whitespace\n";
	}
}

Output for git.master, git.master_jit, rfc.property-hooks: \u0085 (next line) is not matched as whitespace \u00A0 (non-breaking space) is not matched as whitespace \u1680 (ogham space) is not matched as whitespace \u2000 (en quad) is not matched as whitespace \u2001 (em quad) is not matched as whitespace \u2002 (en space) is not matched as whitespace \u2003 (em space) is not matched as whitespace \u2004 (three-per-em space) is not matched as whitespace \u2005 (four-per-em space) is not matched as whitespace \u2006 (six-per-em space) is not matched as whitespace \u2007 (figure space) is not matched as whitespace \u2008 (punctuation space) is not matched as whitespace \u2009 (thin space) is not matched as whitespace \u200a (hair space) is not matched as whitespace \u2028 (line separator) is not matched as whitespace \u2029 (paragraph separator) is not matched as whitespace \u202f (narrow non-breaking space) is not matched as whitespace \u205f (medium mathematical space) is not matched as whitespace \u3000 (ideographic space) is not matched as whitespace

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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2016-08-14 Arrow functions - withdrawn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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