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auto generate username from name and last name

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In my app, we have to auto-generate usernames for our users, here is the code I did.

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  1. <?php
  2. function generarUsername($nombre, apellido_paterno, $apellido_materno, $max_size = 8)
  3. {
  4.   $tentativo = false;
  5.   $i = 0;
  6.   $n = substr($nombre, 0, 1);
  7.   while($tentativo == false && $n != $nombre && $i<15)
  8.   {
  9.     $a = $apellido_paterno.substr($apellido_materno, 0, $i);
  10.     $n = substr($nombre, 0, (strlen($a)  + strlen($n) > $max_size)?(strlen($n) + 1):1);
  11.     $tentativo = substr($n.$a, 0, $max_size);
  12.  
  13.     if(self::getByUsername($tentativo)){
  14.       //This function check if the tentative username is available 
  15.       $tentativo = false;
  16.     }
  17.     $i++;
  18.   }
  19.   return $tentativo;
  20. }
  21. ?>

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