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Check if PHP session has already started
I have a PHP file that is sometimes called from a page that has started a session and sometimes from a page that doesn't have session started. Therefore when I have session_start() on this script I sometimes get the error message for "session already started". For that I've put these lines:
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What does the variable $this mean in PHP?
I see the variable $this in PHP all the time and I have no idea what it's used for. I've never personally used it.
10 An...
Using $_POST to get select option value from HTML
... Where do I put the $selectOption = $_POST['taskOption']; I put it in the php but it does nothing....
– Yunfei Chen
2 days ago
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how to delete all cookies of my website in php
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PHP setcookie()
Taken from that page, this will unset all of the cookies for your domain:
// unset cookies
if (isset($_SERVER['HTTP_COOKIE'])) {
$cookies = explode(';', $_SERVER['HTTP_COOKIE']);
foreach($cookies as ...
What's wrong with using $_REQUEST[]?
...to the much more sensible GP (no C) order with the request_order config in PHP 5.3. Where this is not possible, I personally would avoid $_REQUEST and, if I needed a combined GET+POST array, create it manually.
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Best way to allow plugins for a PHP application
I am starting a new web application in PHP and this time around I want to create something that people can extend by using a plugin interface.
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App Inventor 2 视频播放器教程 - VideoPlayer组件与WebView嵌入播放 · App Inventor 2 中文网
...冲动画
11.4 WebView 播放器的优势
十二、常见问题与解决方案
Q1：视频文件太大无法打包怎么办？
Q2：视频播放时出现黑屏或无法播放？
Q3：如何实现视频循环播放？
Q4：如何获取视频播放进度？
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Best way to do multiple constructors in PHP
...u can't put two __construct functions with unique argument signatures in a PHP class. I'd like to do this:
21 Answers
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【拍照图片处理】Attempt to invoke virtual method 'boolean android.grap...
在做图片识别App的时候，选择相册图片没有问题，拍照后图片就报错：
Attempt to invoke virtual method 'boolean android.graphics.Bitmap.compress(android.graphics.Bitmap$CompressFormat, int, java.io.OutputStream)' on a null object reference
图片大致的处理流程是...
拍照时报错求助！ - App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
...这回不报错了
那可能是初始化中某个代码块导致的报错问题了{:8_368:}App Inventor 2 发表于 2025-04-30 14:09
那可能是初始化中某个代码块导致的报错问题了
找到问题了，MQTT模块遇到报错时的程序里有个死循环，不过我好奇长...