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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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Simplest way to profile a PHP script

What's the easiest way to profile a PHP script? 13 Answers 13 ...
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PHP Function Comments

Just a quick question: I've seen that some PHP functions are commented at the top, using a format that is unknown to me: 4 ...
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PHP: How to send HTTP response code?

I have a PHP script that needs to make responses with HTTP response codes (status-codes), like HTTP 200 OK, or some 4XX or 5XX code. ...
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PHP script - detect whether running under linux or Windows?

I have a PHP script that may be placed on a windows system or a linux system. I need to run different commands in either case. ...
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PHP function to build query string from array

I'm looking for the name of the PHP function to build a query string from an array of key value pairs. Please note, I am looking for the built in PHP function to do this, not a homebrew one (that's all a google search seems to return). There is one, I just can't remember its name or find it on php...
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How to get name of calling function/method in PHP? [duplicate]

...ow users like You :} stackoverflow.com/questions/190421/caller-function-in-php-5/… Now seriously, thanks! – Dawid Ohia Jan 21 '10 at 18:44 ...
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PHPphp://input” vs $_POST

I have been directed to use the method php://input instead of $_POST when interacting with Ajax requests from JQuery. What I do not understand is the benefits of using this vs the global method of $_POST or $_GET . ...
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What are the differences in die() and exit() in PHP?

What are the differences between die() and exit() functions in PHP? 16 Answers 16 ...
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How to remove “index.php” in codeigniter's path

How do I remove the "index.php" sticking out in every path in codeigniter somewhere in the center? I want clean non index.php-fied URLs ? ...