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对于安全性要求不高的情况下足够用了，性能从高到低的两种实现：

<?php
   function xor_enc($string, $operation, $key = 'abcdf') {
      $string = $operation == 'ENCODE' ? $string : base64_decode($string);
      $len1 = strlen($string);
      $len2 = strlen($key);
      if($len1 > $len2) $key = str_repeat($key, ceil($len1 / $len2));
      $string = $operation == 'ENCODE' ? base64_encode($string ^ $key) : $string ^ $key;
      return $string;
   }
?>

   function xor_enc($string, $operation = 'ENCODE', $key = 'abcd') {
      $txt = $operation == 'ENCODE' ? $string : base64_decode($string);
      $len = strlen($key);
      $code = '';
      for ($i = 0; $i < strlen($string); $i ++) {
         $k = $i % $len;
         $code .= $string [$i] ^ $key [$k];
      }
      $code = $operation == 'ENCODE' ? base64_encode($code) : $code;
      return $code;
   }

<?php
   function genstr($num)   
   {  
      for ($i = 0; $i <= $num; $i++)  
      {  
         $str .= chr(mt_rand(97, 122));  
      }  
      return $str;  
   }  

   function geenstr($num) {
      return substr(str_shuffle('abcdefghijklmnopqrstuvwxyz'), 0, $num);
   }

   echo genstr(6); 
?>

20231111更新：

<?php
function isEveryCharInString($needle, $haystack) {
  for ($i = 0; $i < strlen($needle); $i++) {
    if (strpos($haystack, $needle[$i]) !== false) {
      return true; 
    }
  }
  return false; 
}

function readable_random_string($length = 14){ 
  $consonants = array("b","c","d","f","g","h","j","k","l","m","n","p","r","s","t","v","w","x","y","z"); 
  $conscount = count($consonants) - 1;
  $vowels = array("a","e","i","o","u"); 
  $vowcount = count($vowels) - 1;
  $password = ''; 
  for($i = 1; $i <= $length; $i++) { 
    if ($i % 2 == 0) {
      $password .= $vowels[random_int(0, $vowcount)]; 
    } else {
      $password .= $consonants[random_int(0, $conscount)]; 
    }
  } 
  return $password; 
}

function generate_password($length = 14, $special = true, $extra_special = true) {
  $chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
  $special_chars = '!@#$%^&*()';
  $extra_special_chars = '-_[]{}<>~`+=,.;:/\?|';
  //$extra_special_chars = '-_ []{}<>~`+=,.;:/?|';
  if ($special) {
    $chars .= $special_chars;
  }
  if ($extra_special) {
    $chars .= $extra_special_chars;
  }

  while (true) {
    $password = '';
    for ($i = 1; $i <= $length; $i++) {
      $password .= substr($chars, random_int(0, strlen($chars) - 1), 1);
    }
    if (($special && ! isEveryCharInString($password, $special_chars)) || ($extra_special && ! isEveryCharInString($password, $extra_special_chars))) {
      continue;
    }
    return $password;
  }
}

$length = 14;
echo readable_random_string($length).PHP_EOL;
echo generate_password($length, false, false).PHP_EOL;
echo generate_password($length, true, false).PHP_EOL;
echo generate_password($length).PHP_EOL;

UTF-8：

<?php
   function genstr($num)
   {
      for($i=0;$i<=$num;$i++)
      {
         $str .= '&#'.rand(19968, 40869).';';
      }

      return mb_convert_encoding($str, "UTF-8", "HTML-ENTITIES");
   }
   echo genstr(mt_rand(1,8));
?>

GBK：

<?php
   function genstr($num)
   {
      for($i=0;$i<=$num;$i++)
      {
         $str .= chr(rand(0xB0,0xF7)).chr(rand(0xA1,0xFE));
      }

      return $str;
   }
   echo genstr(mt_rand(1,8));
?>

#!/usr/bin/python
# -*- coding: utf-8 -*-  
from time import time
start = time()
stop = time()
print("程序执行时间"+str(stop-start) + "秒")

#!/bin/bash
start=`date +%s`
stop=`date +%s`
echo "程序执行时间$[ stop - start ]秒"