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<?php $input = "sea \u{200B}\u{200B}lion"; echo preg_replace_callback('#\X#u', function($m) { $utf16 = mb_convert_encoding($m[0], 'UTF-16BE', 'UTF-8'); if (strlen($utf16) <= 2) { $esc = '\u' . bin2hex($utf16); } else { $esc = '\u' . bin2hex(substr($utf16, 0, 2)) . '\u' . bin2hex(substr($utf16, 2, 2)); } return $esc; }, $input);
Output for git.master, git.master_jit, rfc.property-hooks
\u0073\u0065\u0061\u0020\u200b\u200b\u006c\u0069\u006f\u006e

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