Online PHP editor | rfc for PJktm

@ 2013-11-15T22:34:16Z

<?php

function replace($string)
{
    return preg_replace_callback('/(?<tag>(?<enter><)?!(?<level>\d+)!(?<leave>>)?)/', function ($match) {
        $level = (int) $match['level'];
        $enter = !empty($match['enter']);
        $leave = !empty($match['leave']);
        if ($enter === $leave)
        {
            var_dump($match);
            return $match['tag'];
        }
        if ($level > 0)
        {
            return vsprintf('%s!%d!%s', [
                $enter ? '<' : null,
                $level - 1,
                $leave ? '>' : null,
            ]);
        }
        return vsprintf('%s?%s', [
            $enter ? '<' : null,
            $leave ? '>' : null,
        ]);
    }, $string);
}

$string = '<!3!= "<!2!= "<!1!= "<!0!= "noodles" !0!>" !1!>" !2!>" !3!>';

ob_start();
eval(sprintf('; ?>%s<?php ', replace($string)));
$string = ob_get_clean();
echo $string . PHP_EOL;

ob_start();
eval(sprintf('; ?>%s<?php ', replace($string)));
$string = ob_get_clean();
echo $string . PHP_EOL;

ob_start();
eval(sprintf('; ?>%s<?php ', replace($string)));
$string = ob_get_clean();
echo $string . PHP_EOL;

ob_start();
eval(sprintf('; ?>%s<?php ', replace($string)));
$string = ob_get_clean();
echo $string . PHP_EOL;

Output for git.master, git.master_jit, rfc.property-hooks: <!2!= "<!1!= "<!0!= "noodles" !0!>" !1!>" !2!> <!1!= "<!0!= "noodles" !0!>" !1!> <!0!= "noodles" !0!> noodles

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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2016-08-14 Arrow functions - withdrawn
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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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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