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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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iOS开发调试技巧总结 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...跑到出现异常的代码中呢？？？异常断点就为我们解决该问题，程序就会在异常出现的那行代码终止。创建异常断点图例如下：
如下所示就创建完成了。如果碰到异常crash时，尝试使用异常断点吧。
【4.符号断点Symbolic Breakp...
Is it possible to create static classes in PHP (like in C#)?
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You can have static classes in PHP but they don't call the constructor automatically (if you try and call self::__construct() you'll get an error).
Therefore you'd have to create an initialize() function and call it in each method:
<?php
class Hello
{
private static...
What's wrong with using $_REQUEST[]?
...a number of posts on here saying not to use the $_REQUEST variable. I usually don't, but sometimes it's convenient. What's wrong with it?
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How to prevent XSS with HTML/PHP?
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Basically you need to use the function htmlspecialchars() whenever you want to output something to the browser that came from the user input.
The correct way to use this function is something like this:
echo htmlspecialchars($st...
Best way to allow plugins for a PHP application
... 5 = 9
4 * 5 = 20
Notes:
For this example source code, you must declare all your plugins before the actual source code that you want to be extendable. I've included an example of how to handle single or multiple values being passed to the plugin. The hardest part of this is writing the actual d...
How do I use PHP namespaces with autoload?
... $class parameter of autoload is the class name as written in constructor call.
– tishma
Feb 6 '13 at 12:29
1
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Get name of caller function in PHP?
Is there a PHP function to find out the name of the caller function in a given function?
12 Answers
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What does the PHP error message “Notice: Use of undefined constant” mean?
...l_escape_string($_POST['message']);
As is, it was looking for constants called department, name, email, message, etc. When it doesn't find such a constant, PHP (bizarrely) interprets it as a string ('department', etc). Obviously, this can easily break if you do defined such a constant later (tho...
Are PHP include paths relative to the file or the calling code?
...e location of A.PHP? That is, does it matter which file the include is called from, or only what the current working directory is- and what determines the current working directory?
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