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Integer To Alphanumeric Character

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A function that converts an integer between 0 and 61 into an alphanumberic character.  Ranges from 0-9, A-Z, a-z.  Very handy for generating random strings and stuff like that.  


function map_char($num) { 
   $int = $num; $int+=48;
   ($int > 57) ? $int += 7 : null;
   ($int > 90) ? $int += 6 : null;
   return chr($int);
}

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