PHP SQL判断字符串是否存在

想写一个PHP的用户系统作为软件后台, 注册时怎么判断帐号是否已经存在? 用的mysql_num_rows 但是只能判断纯英文或纯数字。 求答案

$search = "SELECT * FROM 表名 WHERE user = {$user}";
$res = mysql_query($search);
if($res && mysql_num_rows($res)>0){
die("该帐号已被他人注册");
}else{
//注册
}

php

2个回答

不是太明白你的意思,你的意思是用户名里面除了英文和数字还有其他的东西是吗?正常英文数字你这样判断基本上没毛病

'SELECT * FROM 表名 WHERE user = "{$user}"'

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