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Random Number Generator

/ Published in: PHP
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This snippet generates a random string of random length

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  1. function str_rand ($minlength, $maxlength, $useupper=true, $usespecial=false, $usenumbers=true) { 
  2.  
  3. $key ="";
  4.     $charset = "abcdefghijklmnopqrstuvwxyz"; 
  5.     if ($useupper)   $charset .= "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; 
  6.     if ($usenumbers) $charset .= "0123456789"; 
  7.     if ($usespecial) $charset .= "~@#$%^*()_+-={}|][";   // Note: using all special characters this reads: "~!@#$%^&*()_+`-={}|\\]?[\":;'><,./"; 
  8.     if ($minlength > $maxlength) $length = mt_rand ($maxlength, $minlength); 
  9.     else                         $length = mt_rand ($minlength, $maxlength); 
  10.     for ($i=0; $i<$length; $i++) $key .= $charset[(mt_rand(0,(strlen($charset)-1)))]; 
  11.     return $key; 
  12. }

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