尝试在PHP中基于url显示标题_Php_If Statement

尝试在PHP中基于url显示标题

php if-statement

尝试在PHP中基于url显示标题,php,if-statement,Php,If Statement,所以我准备了一个简单的php页面，它将根据url的位置显示不同的内容。出于某种原因，它似乎什么也不做就完成了整个if语句 <?php if(array_key_exists('offer', $_GET)) { if( $_GET == "ncp" ){ $title = 'Exclusive Offer from NCP'; } elseif($_GET == "rt") { $title = 'Ex

所以我准备了一个简单的php页面，它将根据url的位置显示不同的内容。出于某种原因，它似乎什么也不做就完成了整个if语句

<?php
    if(array_key_exists('offer', $_GET)) {
        if( $_GET == "ncp" ){
            $title = 'Exclusive Offer from NCP';
        } elseif($_GET == "rt") {
            $title = 'Exclusive Offer from RT';
        } elseif($_GET == "oo") {
            $title = 'Exclusive Offer from OO';
        }
    } else {
        $title = 'Check Out These Exclusive Offers!';
    }
    $title = strip_tags($title);
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title><?php echo $title; ?></title>
<link href="style.css" rel="stylesheet" type="text/css" />
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js" ></script>
<script type="text/javascript">

</script>
</head>

您应该使用

$\u GET['offer']==“foo”

而不是

$\u GET==“foo”

更好的方法是，在将来使用严格的比较，以确保比较相同的类型（在本例中为字符串）：

==

。这是因为PHP倾向于强制转换类型，这既有用又烦人（请参阅）：

$\u GET

：

比较运算符：

这是如何在php中使用$\u GET的。试试看

<?php
if(isset($_GET['offer'])){
    if( $_GET['offer'] == "ncp" ){
    $title = 'Exclusive Offer from NCP';
    }
    elseif( $_GET['offer'] == "rt" ){
    $title = 'Exclusive Offer from RT';
    }
    elseif( $_GET['offer'] == "oo" ){
    $title = 'Exclusive Offer from OO';
    }
} 
else {
    $title = 'Check Out These Exclusive Offers!';
}
$title = strip_tags($title);
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title><?php echo $title; ?></title>
<link href="style.css" rel="stylesheet" type="text/css" />
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js" ></script>
<script type="text/javascript">
</script>
</head>

另一种方法试试这个我总是强调清理通过$\u POST、$\u GET或任何外部源传递的任何变量，这就是我使用filter\u var的原因

<?php

    if(isset($_GET['offer'])) {     
      //lets sanitize $_GET['offer'] if it exist since its passed via url
      $offer = filter_var($_GET['offer'], FILTER_SANITIZE_STRING);
    } else {
      $offer = NULL;
    }

    switch ($offer) {
    case 'ncp':
      $title = 'Exclusive Offer from NCP';
    break;
    case 'rt':
      $title = 'Exclusive Offer from RT';
    break;
    case 'oo':
      $title = 'Exclusive Offer from OO';
    break;
    default:
      $title = 'Check Out These Exclusive Offers!';
    break;
    }

?>

阅读手册中的

$\u GET

变量（提示：它是数组）。如果您自己设置

条带标签，为什么要添加它？如果你说的是

语句，那又是什么呢？整体还是另一个？@ElonThan我删除了我的评论（哪里是

报价

数组），所以类似这样的问题，再次。。。“打开另一罐虫子”。实际上我今天应该去钓鱼。

$\u GET

是一个数组。您直接将该数组与字符串进行比较。“这是不可能的。”OneEightLeft：见下面joren的答案。

<?php

    if(isset($_GET['offer'])) {     
      //lets sanitize $_GET['offer'] if it exist since its passed via url
      $offer = filter_var($_GET['offer'], FILTER_SANITIZE_STRING);
    } else {
      $offer = NULL;
    }

    switch ($offer) {
    case 'ncp':
      $title = 'Exclusive Offer from NCP';
    break;
    case 'rt':
      $title = 'Exclusive Offer from RT';
    break;
    case 'oo':
      $title = 'Exclusive Offer from OO';
    break;
    default:
      $title = 'Check Out These Exclusive Offers!';
    break;
    }

?>