php 指定位数随机密码

<?php
function generate_password( $length = 8 ) { 
  $chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'; 
  $password = ""; 
  for ( $i = 0; $i < $length; $i++ ) 
  { 
    $password .= $chars[ mt_rand(0, strlen($chars) - 1) ]; 
  } 
  return $password; 
}
?>

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