PHP page value transfer

PHP Page transfer value

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1.Form Form transfer value

Front page ：

<form action="login.php" method="post">
    <label><input class="text" type="text" placeholder=" user name " name="username"/></label><br>
    <label><input class="text" type="password" placeholder=" password " name="password"/></label><br>
    <label><select size="1" class="text" style="width:95px;height:25px;" name="identity">
        <option> Student </option>
        <option> Administrators </option>
    </select></label><br>
    <label><input class="submit" type="submit" name="submit" value=" Sign in "/></label>
</form>

Back end page login.php

Through the front end input Data selected in the input box , From the back end through the selected method Method

 $username = $_POST['username'];
 $password = $_POST['password'];
 $identity = $_POST['identity'];
// If you choose get The way 
 $username = $_GET['username'];
 $password = $_GET['password'];
 $identity = $_GET['identity'];

2.< a > Link transfer value

In all the similar href Links can be transferred and adjusted in the following form .

front end ： You can use string functions to splice calls and pass values .

<a href="test.php?haha=3&ha=4"> test </a>

Back end fetch value ： The URL during transmission is as follows , You can see many corresponding passes GET Method retrieval .

//http://localhost:63342/upload_multi.php/test.php?haha=3&ha=4
$user=$_GET['haha'];
$name=$_GET['ha'];
echo $user,$name;

3.Cookie and Session

Cookie Is equivalent to automatically generating a cookie Files are used to store data , When the file expires, it will be automatically deleted .

session Be similar to cookie Will generate a random id As session The name of the file , Stored in the memory of the server , When closing the page ,id It will log out automatically .

Set up cookie as well as session

setcookie('username', $userName, time() + 18000);
setcookie('identity', $identity, time() + 3600);// Set an hour 

session_start();
$_SESSION['username'] = $userName;

call cookie and session

$username=$_COOKIE['username'];
$identity=$_COOKIE['identity'];

session_start();
$username=$_SESSION['username']

4.AJAX Pass value （ Advanced processing ）

front end ：

<form action="" method="post" οnsubmit=>
    <label><input class="text" type="text" placeholder=" user name " name="username"/></label><br>
    <label><input class="text" type="password" placeholder=" password " name="password"/></label><br>
    <label><select size="1" class="text" style="width:95px;height:25px;" name="identity">
        <option> Student </option>
        <option> Administrators </option>
    </select></label><br>
    <label><input class="submit" type="submit" name="submit" value=" Sign in "/></label>
</form>
<script> function _(el) {
       return document.getElementById(el); } function uploadFile() {
       let content = _('text').value; const formdata = new FormData();// Generate formdata For data transfer  let i, temp; time = getCurrentDate(); unique_arr.push(temp); formdata.append('content', content); formdata.append('username', username); for (i = 0; i < unique_arr.length; i++) {
       formdata.append('unique[]', unique_arr[i]); } t2 = window.setInterval("clock()", 1500) var ajax = new XMLHttpRequest(); ajax.open("POST", "test.php"); ajax.send(formdata); } </script>

Back end ：

ajax.open("POST", "test.php"); According to the selected method and page , You can choose the page through POST Method to call the value