二十一段救命的PHP代码

　1. PHP可阅读随机字符串

　　此代码将创建一个可阅读的字符串，使其更接近词典中的单词，实用且具有密码验证功能。

/************** 
*@length - length of random string (must be a multiple of 2)

 **************/ 

function readable_random_string($length = 6){     
$conso=array("b","c","d","f","g","h","j","k","l",     "m","n","p","r","s","t","v","w","x","y","z");     
$vocal=array("a","e","i","o","u");     
   $password="";    
    srand ((double)microtime()*1000000);    
    $max = $length/2;     
for($i=1; $i<=$max; $i++)     {     
    $password.=$conso[rand(0,19)];     
    $password.=$vocal[rand(0,4)];     
}     
    return $password; 
}  

　　2. PHP生成一个随机字符串

　　如果不需要可阅读的字符串，使用此函数替代，即可创建一个随机字符串，作为用户的随机密码等。

/************* *
@l - length of random string */ 
function generate_rand($l){      $c= "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";  
 srand((double)microtime()*1000000);  
 for($i=0; $i<$l; $i++) {      
 $rand.= $c[rand()%strlen($c)];   
}  
 return $rand;
 }