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<?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;

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