How to pass value in php page

When we create dynamic websites, we often use the method of passing values ​​to the page to transfer information. Below we will introduce to you how to pass values ​​on pages in PHP.

Recommended tutorial: PHP video tutorial

##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 2: Carrying parameters and passing 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 3: 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 webpage or before the SESSION cycle. POST and GET will be available as long as PHP is executed. Will be released immediately)

<?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 a global variable), and the 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 the database and then retrieve it

The advantage is: it can be stored for a long time.

The disadvantage is that 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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