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<?php preg_replace_callback( '~\[admin(.+?)\[/admin\]~is', function($m) { return '[admin' . strtr(un_htmlspecialchars($m[1]), array("\n" => '&#13;', ' ' => ' &#32;')) . '[/admin]'; }, '[admin]test[/admin]' );
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Call to undefined function un_htmlspecialchars() in /in/Yba2U:5 Stack trace: #0 [internal function]: {closure}(Array) #1 /in/Yba2U(2): preg_replace_callback('~\\[admin(.+?)\\[...', Object(Closure), '[admin]test[/ad...') #2 {main} thrown in /in/Yba2U on line 5
Process exited with code 255.

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