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<?php
require ("config.php")//你的配置文件,主要是定义数据库名字、用户名、密码等
$qid = mysql_query("select count(*) as total from tab ");
$res = mysql_fetch_array($qid);
$count = $res['total'];
if ($count=0)
echo "用户名不存在";
else
echo "用户名存在"
mysql_close();
<?php
require ("config.php")//你的配置文件,主要是定义数据库名字、用户名、密码等
$qid = mysql_query("select count(*) as total from tab ");
$res = mysql_fetch_array($qid);
$count = $res['total'];
if ($count=0)
echo "用户名不存在";
else
echo "用户名存在"
mysql_close();