Detailed introduction and examples of several ways to transfer values ​​between PHP pages

Method 1, require_once

//Page a:
    <?php
            $a = "hello";
    ?>
//Page b:
    <?php
        require_once "A.php";
        echo $a." world!";
    ?>

When you access b.php, you will get: hello world!

Method two, carry parameters and pass values ​​when jumping through the page

//Page a:
<?php
    $a = "world";
?>
    <a href="b.php?m=$a">点我跳到b.php</a>
//Page b:
<?php
    echo "hello".$_GET[&#39;m&#39;];
?>

Method three, form submission

<form name="form1" method="post" action="2.php">
  <input type="text" name="val" />
  <input type="submit" name="Submit" value="提交" />
</form>
//2.php：
<?php
    echo $_POST[&#39;val&#39;];
?>

Method 4, SESSION session

(SESSION is a global variable. As long as it is declared, it is available on all pages without closing the web page or until the SESSION cycle. POST and GET will be released immediately as soon as php is executed)

<?php
    session_start();
    $_SESSION[&#39;val&#39;]=&#39;123&#39;;
    echo $_SESSION[&#39;val&#39;];
?>
<?php
    session_start();
    echo $_SESSION[&#39;val&#39;];    //直接输出全局变量val.
?>

Method 5, COOKIE

The cookie is stored on the client (also Global variables), session is stored on the server. This is the only difference between the two.

<?php   
     setcookie("user", "SUVLLIAN", time()+3600);    //创建一个名为user的cookie变量，它的值是Alex Porter。它将在一个小时以后过期，也就是不能访问了
     echo $_COOKIE[&#39;user&#39;];    //还要刷新一下页面才可以生效
?>

Method 6. Store in database

Advantages: Can be stored for a long time.

Disadvantages: Every time you need to use it, you need to query it in the database, which consumes a lot of resources.

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