php动态生成 复杂、纯英文、纯数字密码
function randpw($len=8,$format='ALL'){
$is_abc = $is_numer = 0;
$password = $tmp ='';
switch($format){
case 'ALL':
$chars='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
break;
case 'CHAR':
$chars='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
break;
case 'NUMBER':
$chars='0123456789';
break;
default :
$chars='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
break;
}
mt_srand((double)microtime()*1000000*getmypid());
//组合字符串
while(strlen($password)<$len){
//随机字符或数字
$tmp =substr($chars,(mt_rand()%strlen($chars)),1);
//判断是否出现数字了
if(($is_numer <> 1 && is_numeric($tmp) && $tmp > 0 )|| $format == 'CHAR'){
$is_numer = 1;
}
//判断是否出现字符了
if(($is_abc <> 1 && preg_match('/[a-zA-Z]/',$tmp)) || $format == 'NUMBER'){
$is_abc = 1;
}
//连接
$password.= $tmp;
}
//判断条件是否符合，或者重新生成
if($is_numer <> 1 || $is_abc <> 1 || empty($password) ){
$password = randpw($len,$format);
}
return $password;
}
for($i = 0 ; $i < 10; $i++){
echo randpw(8,'NUMBER');
echo "
";
}
