我希望能够回显数组中的所有元素？

Question

I pretty newbie to php and javascript but more i am curious about PHP. I want to add elements into a empty array every time i add a new element trough a input form, and after that i want those elements to be displayed in to the browser .The code i use is this

  <form action="index.php" method="POST">
    <input type="text" name="name" placeholder="name"><br><br>
    <input type="submit" name="submit" value="enter"><br><br>
</form>

<?php

if (isset($_POST['submit'])) {
    $_SESSION['names']=array();
    $names=$_SESSION['names'];
    $name=$_POST['name'];


    array_push($names,$name);

    for($i=0;$i<count($names);$i++){
        echo $names[$i];
    }


};

How could i achieve to display every element inside the array that i add trough the input field in php?

Answer 1

You overwrite the value every time because you wipe out the array on every page load: $_SESSION['names']=array();. Instead check to see if that session variable exists (and is an array) first and, if it doesn't, then create it. Otherwise just append to that array.

<form action="index.php" method="POST">
    <input type="text" name="name" placeholder="name"><br><br>
    <input type="submit" name="submit" value="enter"><br><br>
</form>


<?php
session_start();    

if (isset($_POST['submit'])) {
    if (!isset($_SESSION['names']) || !is_array($_SESSION['names'])) {
        $_SESSION['names'] = array();
    }
    $name = $_POST['name'];
    $_SESSION['names'][] = $name;

    $num_names = count($_SESSION['names']);
    for($i=0;$i<$num_names;$i++){
        echo $_SESSION['names'][$i];
    }
};