Three tips for implementing page jump in PHP

Source: Internet
Author: User
Php uses the header function, Meta tag, and JavaScript to implement page jump. the Function of PHP page jump is to redirect one webpage to another. For friends who have just learned the PHP language, it is a basic method that must be mastered.

PHP is the preferred language for WEB development by many programmers. In actual development, all the functions of the website can be met by compiling in PHP, such as PHP page jump.

In a Web system, redirecting from one Web page to another is one of the most commonly used technologies in LAMP projects. Page jump may be caused by the user clicking a link or button, or automatically generated by the system. This section describes common methods for automatically page redirect in PHP.

PHP page jump 1: header () function

The header () function is a very simple method for page jump in PHP. The main function of the header () function is to output the HTTP 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 header or add a header of the same type. the default parameter is replace.

The second optional parameter http_response_code sets the HTTP code as the specified value. The Location header in the header function is a special header call, which is often used to redirect pages. Note: 1. there cannot be spaces between location and:. otherwise, no jump will be made.

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 the first PHP community download site.

<? Php // redirect the browser header ("Location: # xiazai"); // make sure that the subsequent code will not be executed after the redirection;?>

PHP page jump 2: Meta tag

Meta tag is the tag that provides document Meta information in HTML. you can use this tag in a PHP program to redirect pages. If http-equiv is defined as refresh, the page will be redirected to the corresponding page within a certain period of time based on the value specified by content.

If you set content = "seconds; url = url", it defines how long the page will jump to the specified url. For example, the page automatically jumps to the first PHP community download site after the meta tag is used to implement the vaccine

< meta http-equiv="refresh" content="1;url=#xiazai">

For example, the following meta. php program will automatically jump to the page one second after it stays on the page # xiazai

<? Php $ url = "# xiazai";?> <Html> 

PHP page jump 3: JavaScript

For example, this code can be placed in any legal position in the program.

< ?php  $url = "";  echo "< script language='javascript' type='text/javascript'>";  echo "window.location.href='$url'";  echo "< /script>";  ?>

Practical example:

// Output the prompt and return to the previous echo "script" alert ('You have no permission! '); Location. href =' ". $ _ SERVER [" HTTP_REFERER "]." '; script ";

The above are the three PHP page jump implementation methods we will introduce to you.

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