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<?php $find = array( "0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f" ); $replace = array( "a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p" ); $find = array_flip($find); echo preg_replace_callback('/[a-f0-9]/', function ($v) use($replace, $find) { return $replace[$find[$v[0]]]; }, $haystack); ?>
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $haystack in /in/mTNma on line 9 Deprecated: preg_replace_callback(): Passing null to parameter #3 ($subject) of type array|string is deprecated in /in/mTNma on line 7

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