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<?php $str = json_decode('{"a": "\u000f\u000f?\u001f\u000f\u000e\u000f\u001e\u00c3"}')->a; var_dump(hex($str)); $str = preg_replace('/[\x00-\x19\x7f]/', '', $str); var_dump(hex($str)); function hex($s) { $h = ''; for ($i = 0; $i < strlen($s); $i++) { $h .= dechex(ord($s[$i])) . ' '; } return $h; }
Output for git.master, git.master_jit, rfc.property-hooks
string(25) "f f 3f 1f f e f 1e c3 83 " string(15) "3f 1f 1e c3 83 "

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