php简单生成一组与多组随机字符串的方法

<?php
$str = "0123456789abcdefghijklmnopqrstuvwxyz~@#()_";//输出字符集
$n = 10;//输出串长度
$len = strlen($str)-1;
  for($i=0 ; $i<$n; $i++){
    $s .= $str[rand(0,$len)];
  }
  echo $s . "<br/>";
  $s = "";
?>

<?php
$str = "0123456789abcdefghijklmnopqrstuvwxyz~@#()_";//输出字符集
$n = 10;//输出串长度
$len = strlen($str)-1;
for($j=0 ; $j<200 ; $j++){
  for($i=0 ; $i<$n; $i++){
    $s .= $str[rand(0,$len)];
  }
  echo $s . "<br/>";
  $s = "";
}
?>