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<?php class x { public $a = [ '~.~' => '$this->waa($0);' ]; function p($s) { foreach($this->a as $p => $r) { $s = preg_replace_callback($p, function($m) use ($s){ $c = preg_replace('~\$(\d)~', '$m[$1]', $s); print "\n$c\n"; return eval($c); }, $s); } return $s; } function waa($t){ return '*'.$t.'*'; } } var_dump((new x)->p('wazup'));
Output for git.master, git.master_jit, rfc.property-hooks
wazup Parse error: syntax error, unexpected end of file in /in/tFM1V(17) : eval()'d code on line 1
Process exited with code 255.

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