What are the ways to pass values ​​in php?

There are 4 ways to pass values ​​in PHP, which are: 1. Using the cookie of the client browser; 2. Using the server-side session; 3. Using the form to pass; 4. Using hyperlinks to pass parameters.

There are four ways to pass values ​​in php

We define page01.php and page02.php PHP file, find a way to transfer the content in page01 to page02, and then let us continue to use it.

The first type:

Use the cookie of the client browser. 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.

The code is as follows:

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

We have defined a variable mycookie, whose value is the string 'self-spirit'.

We can name cookie variables whatever we want and define multiple cookie variables.

Accept cookies on page02.

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 have completed using cookies to transfer parameters from page to page.

Second:

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.

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.

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 array The subscript 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:

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 which page the content of this form 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:

The code is as follows:

<?php 
     $wu = $_POST[&#39;wuziling&#39;];
     echo $wu;
?>

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'];

Fourth method:

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:

The code is as follows:

<?php 
$var = &#39;I love you !&#39;;
?>
<a href="<?php echo "page02.php?new=".$var ?>">get</a>

Define a variable $var and specify in the href attribute of hyperlink a that you want to 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:

The code is as follows:

<?php
     echo   $_GET[&#39;new&#39;];
?>

Use $_GET[] to get the value of new, and then you can output or use it for other purposes. You can directly see the new variable and its value in the address bar of the browser. .

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