How to implement header jump in php and precautions:
The header() function is a very useful method for page jump in PHP. simple way. The main function of the header() function is to output the HTTP protocol header (header) to the browser.
The header() function is defined as follows:
void header (string string [,bool replace [,int http_response_code]])
The optional parameter replace indicates whether to replace the previous similar header or add one of the same type (www.php.cn) Header, default to replace.
The second optional parameter http_response_code forces the HTTP corresponding code to the specified value. The Location type header in the header function is a special header call, often used to implement page jumps. Note: There cannot be a space between
1.location and the ":" sign, otherwise it will not jump.
2. There cannot be any output before using the header.
3.The PHP code after the header will also be executed. For example, redirect the browser to php.cn
<?php //重定向浏览器 header("Location: https://www.php.cn"); //确保重定向后,后续代码不会被执行 exit; ?>
1. PHP jump code in one sentence:
<?php $url = $_GET['url']; Header("Location:$url"); ?>
2. PHP jump code if judgment:
Copy the code as follows:
if($_COOKIE["u_type"]){ header('location:register.php'); } else{ setcookie('u_type','1','86400*360');//设置cookie长期有效 header('location:zc.html');
Note: Save it as zc.php. When the user visits zc.php, determine whether a cookie exists. If it exists (www.php .cn) will jump to register.php. If it does not exist, create a cookie and jump to zc.html.
URL redirection function
function redirect($url, $time=0, $msg=”) { //多行URL地址支持 $url = str_replace(array(“n”, “r”), ”, $url); if ( empty($msg) ) $msg = “系统将在{$time}秒之后自动跳转到{$url}!”; if (!headers_sent()) { // redirect if (0 === $time) { header(‘Location: ‘ . $url); } else { header(“refresh:{$time};url={$url}”); echo($msg); } exit(); } else { $str = “<meta http-equiv='Refresh' content='{$time};URL={$url}'>”; if ($time != 0) $str .= $msg; exit($str); } }
The above cannot return the 404 status. If the 404 status code is returned after the page jumps, we can do the following
function getref() { $url = @$_SERVER['HTTP_REFERER']; if( !empty( $url ) ) { if( !strstr($url ,'jb51.net' ) && !strstr($url,'jb51.net')) { @header("http/1.1 404 not found"); @header("status: 404 not found"); include("404.html");//跳转到某一个页面,推荐使用这种方法 exit(); } } else { @header("http/1.1 404 not found"); @header("status: 404 not found"); include("404.html");//跳转到某一个页面,推荐使用这种方法 exit(); } }
If you want to do 301, it is almost the same
<?php $the_host = $_SERVER['HTTP_HOST']; $request_uri = isset($_SERVER['REQUEST_URI']) ? $_SERVER['REQUEST_URI'] : ''; if($the_host !== 'www.jb51.net') { //echo $_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF']; header('HTTP/1.1 301 Moved Permanently'); header('Location: https://www.jb51.net' . $_SERVER['PHP_SELF'] . $request_uri); } ?>
Related recommendations: php中文网
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实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。


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