标签：运算符
运算符5.位运算符 6.其他运算符
<?php
/*
PHP中的运算符类型：
1：算术运算符
2：递增/递减运算符
3：比较运算符
4：逻辑运算符
5：位运算符
6：其它运算符
*/
/*1:算术运算符
$a = 100;
$b = 200;
$c = $a + $b;
$d = $c-300;
$e = $c*2;
$f = $e/3;
$g = 5%3;
echo ‘$c=‘.$c.‘
$d=‘.$d.‘
$e=‘.$e.‘
$f=‘.$f.‘
5/3的余数是:‘.$g;
*/
/*
2：递增/递减运算符
$a = $a+1;
$a+=1;
$a++;
++$a;
--$a;
$a--;
$a = 1;
$c = 10 + $a++;
echo "<h1>\$a = ".$a."</h1>";
echo "<h1>\$c = ".$c."</h1>";
echo "-----------------------------------";
$a = 1;
$c = 10 + ++$a;
echo "<h1>\$a = ".$a."</h1>";
echo "<h1>\$c = ".$c."</h1>";
*/
/*
3：比较运算符
> 大于 <小于 >=大于等于 <=小于等于
<> != 不等于 !==不全等于 ==等于 ===全等于
*/
$a = 2;
$b = ‘2‘;
var_dump($a !== $b);
<?php
$a = 1;
$user_arr= array("admin","tt","houdunwang","bbs");
$upwd_arr = array("admin"=>"123456","tt"=>"555","houdunwang"=>"888","bbs"=>"999");
$uname = isset($_GET[‘uname‘])?$_GET[‘uname‘]:‘‘;
$upwd = isset($_GET[‘upwd‘])?$_GET[‘upwd‘]:‘‘;
if(in_array($uname,$user_arr)){
if($upwd == $upwd_arr[$uname]){
echo "登录成功，可以进行后台操作";
$ok = true;
}else{
echo ("密码错误");
}
}else{
echo ("用户名不存在");
}
?>
<html>
<head>
</head>
<body>
<?php
if($ok){
echo "欢迎来到网站后台";
}else{
?>
<form method="get" action="">
用户名：<input type="text" name="uname"/>
密码:<input type="text" name="upwd"/>
<input type="submit" value="会员登录"/>
</form>
<?php }?>
</body>
</html>标签：运算符
原文地址：http://ssspure.blog.51cto.com/8624394/1563834
