Question

我在页面上有一个按钮，它是一个简单的输入提交按钮，它将页面ID发送到另一页面上的表单，以将其保存在PHP会话中。

我想知道如果该项目已经在您的会话中，我将如何显示删除按钮？

这是表单发送到

的代码

<?php
session_start();
if(!in_array($_POST['event_id'], $_SESSION['event_orders'])) {
    $_SESSION['event_orders'][] = $_POST['event_id'];
}
?>

带有按钮的页面实际上没有任何会话代码，但我想它会是类似的IF类型的语句，但我不确定我应该使用的确切语法？如何将ID从会话中移除？

编辑：

这样的事情会起作用吗？放置表单按钮。

<? if(isset($_SESSION['event_orders']))
{
    echo "<a href='".$_SERVER['PHP_SELF']."?delete'>delete</a>";
}
else if(!in_array($_POST['event_id'], $_SESSION['event_orders'])) {
    // echo the submit button;
} ?>

Answer 1

您可以使用未设置的功能。参考：http://php.net/manual/en/function.unset.php

Answer 2

<?php
session_start();
//if request parameter delete is present then unset the array
if(isset($_REQUEST['delete']))
{
    unset($_SESSION['event_orders']);
}   
else if(isset($_SESSION['event_orders']))
{
    //displays delete link which redirects to same page with an additional request parameter as url?delete
    echo "<a href='".$_SERVER['PHP_SELF']."?delete'>delete</a>";
}
else if(!in_array($_POST['event_id'], $_SESSION['event_orders'])) {
    $_SESSION['event_orders'][] = $_POST['event_id'];
}
?>

修改我们只需删除特定的数组项而不是完全取消数组。

<?php session_start(); //if request parameter delete is present then unset the array if(isset($_REQUEST['delete'])) { unset($_SESSION['event_orders'][$_REQUEST['delete']]); var_dump($_SESSION['event_orders']); } else if(in_array($_POST['event_id'], $_SESSION['event_orders'])) { //displays delete link which redirects to same page with an additional request parameter as url?delete $key = array_search($_POST['event_id'], $_SESSION['event_orders']); var_dump($_SESSION['event_orders']); echo "<a href='".$_SERVER['PHP_SELF']."?delete=".$key."'>delete</a>"; } else { $_SESSION['event_orders'][] = $_POST['event_id']; var_dump($_SESSION['event_orders']); } ?>

从会话中删除项目（显示删除按钮）

2 个答案: