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function random_readable_pwd($length=10){

  // the wordlist from which the password gets generated

  // (change them as you like)

  $words = 'dog,cat,sheep,sun,sky,red,ball,happy,ice,';

  $words .= 'green,blue,music,movies,radio,green,turbo,';

  $words .= 'mouse,computer,paper,water,fire,storm,chicken,';

  $words .= 'boot,freedom,white,nice,player,small,eyes,';

  $words .= 'path,kid,box,black,flower,ping,pong,smile,';

  $words .= 'coffee,colors,rainbow,plus,king,tv,ring';

  // Split by ",":

  $words = explode(',', $words);

  if (count($words) == 0){ die('Wordlist is empty!'); }

  // Add words while password is smaller than the given length

  $pwd = '';

  while (strlen($pwd) < $length){

    $r = mt_rand(0, count($words)-1);

    $pwd .= $words[$r];

  }

  // append a number at the end if length > 2 and

  // reduce the password size to $length

  $num = mt_rand(1, 99);

  if ($length > 2){

    $pwd = substr($pwd,0,$length-strlen($num)).$num;

  } else {

    $pwd = substr($pwd, 0, $length);

  }

  return $pwd;

}

//使用范例：

random_readable_pwd(10) => returns something like: pingwater6, radiohap28, sunwhite84, happykid44, etc...