Four methods for passing parameters between PHP pages

This article is a detailed analysis and introduction of the four methods of parameter transfer between PHP pages. Friends in need can refer to it

We define two php files, page01.php and page02.php, and Find a way to pass the content in page01 to page02, and then let us continue to use it.
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The first:
Use client browser cookies. A cookie is easy to understand. It is a temporary file. You can think of it as a storage room. The browser records some information during the browsing process and temporarily stores it here.
Set a cookie in page01.

Copy code The code is as follows:

<?php 
       setcookie(&#39;mycookie&#39;,&#39;自灵&#39;);
?>

It’s that simple, we have created the cookie.
We defined a variable mycookie, whose value is the string 'self-spirit'.
We can name the cookie variable whatever we want and define multiple cookie variables.
Accept cookies on page02.

Copy code The code is as follows:

<?php
     $wuziling = $_COOKIE[&#39;mycookie&#39;];
     echo $wuziling;
?>

We use $_COOKIE[] to extract the variable mycookie in the cookie and pay its value to $wuziling. Then simply output.
Okay, here we are done using cookies to pass parameters from page to page.
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Second type:
Use server-side session. Understanding session is very easy. The difference from a cookie is that it is a temporary storage on the server side. Session is often called a session.
Set a session in page01.

Copy code The code is as follows:

<?php 
session_start();
$_SESSION["temp"]=array(&#39;123&#39;,&#39;456&#39;,&#39;789&#39;);
?>

To use session, session must be started. session_start(); is the method to start the session. Generally it should be written first.
In the second statement, I defined a $_SESSION["temp"] array. The name of the array is $_SESSION["temp"], which stores 3 strings.
Accept session on page02.

Copy code The code is as follows:

<?php 
     session_start();
     for($i=0;$i<3;$i++)
     {
             echo $_SESSION[&#39;temp&#39;][$i].&#39;<br />&#39;;
     }
?>

First start the session. After startup, the variables we defined in page01 are already available and do not require any other acquisition operations. This is different from cookies.
Below we use a for loop to output its content.
[Don’t think that $_SESSION['temp'][$i] is a two-dimensional array. It is a one-dimensional array. The name of the array is $_SESSION["temp"]. Although this name is more complicated, the bottom of the array The mark is 'temp']
[When we write $_SESSION["temp"], temp plus double quotes or single quotes are equivalent. 】
【Here we define an array when defining session variables, or we can define ordinary variables, just like what is mentioned in cookies】
----------------- -------------------------------------------------- -------------
Third option:
Use a form to pass.
page01.php is written like this:

Copy code The code is as follows:

<form action="page02.php" method="post">
     <input type="text" name="wuziling" />
     <input type="submit" name="submit" value="提交" />
</form>

The attribute action in the form directly specifies this Which page the form content is passed to. method specifies the method of transfer. post stands for using messaging, just like how we send text messages.
page02.php is written like this:

Copy code The code is as follows:

<br/>

Use $_POST[] to get the passed variable value. This variable name wuziling is defined in the name attribute of the form's input tag.
Then pass it to another variable $wu. So we can output. Direct output is also possible, echo $_POST['wuziling'];
[If you don’t understand something, please refer to another post in this section that details form submission]
[The value of method can also be get]
-------------------------------------------------- ----------------------------------
Fourth type:
Use hyperlinks to pass parameters. Many of our online operations involve clicking on hyperlinks to jump between web pages. Parameters can also be passed while clicking.
page01.php is written like this:

Copy code The code is as follows:

57b5e52c8142dd843b737f07a0ed1dd7
93636ebe447af5b66703e7ae831f768a">get16ef26f8b7ea0fc89bdf90e275a93e5d

Define a variable $var.
The href attribute of hyperlink a states that it will jump to the page02 page. Add a question mark after it, and a self-defined variable new [this name will be used on the page02 page]. The value of new is the $var we want to pass.
page02.php is written like this:

Copy code The code is as follows:

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##Use $_GET[ ] to get new The value can then be output or used for other purposes. At this time, the new variable and its value can be directly seen in the browser address bar.

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