How to disable XDebug

Question 1

I think that my server became slow since I installed XDebug. So, in order to test my hypothesis I want to disable XDebug completely. I've been searching for tutorials on how to do this but I can't find such information.

Question 2

Find your php.ini and look for XDebug.

Set xdebug autostart to false

xdebug.remote_autostart=0  
xdebug.remote_enable=0

Disable your profiler

xdebug.profiler_enable=0

Note that there can be a performance loss even with xdebug disabled but loaded. To disable loading of the extension itself, you need to comment it in your php.ini. Find an entry looking like this:

zend_extension = "/path/to/php_xdebug.dll"

and put a ; to comment it, e.g. ;zend_extension = ….

Check out this post XDebug, how to disable remote debugging for single .php file?

Question 3

The fast copy-paste way

sudo sh -c 'echo zend_extension=$(find /usr/lib/php/extensions -name "xdebug.so") >> $(php -qr "echo php_ini_loaded_file();") && apachectl restart'

This command do the following :

Finds the native Xdebug extension that comes with Xcode
Asks php which config file is loaded
Adds the Xdebug extension path in the config file
Restarts apache.

Compatible with Sierra, El Capitan & Yosemite with the bundeled apache, but untested with MAMP & XAMPP.

Before launching the command, make sure Xcode command line tools are installed : xcode-select --install

Question 4

I found the answer by specifying a custom php.ini file for apache, and left the original php.ini file for cli.

in your apache configuration file. Just write the following bit of code.

<IfModule php5_module>
    PHPINIDir "C:/PATH/TO/CUSTOM/INI"
</IfModule>

Question 5

Zend OPCache included in PHP 5.5

On the 21st March 2013, the PHP 5.5 beta 1 was released including "Zend OPCache" - It looks firmly like this will be the replacement for APC going forward as it is included in the PHP core, and will have to be maintained for each new release.

I would personally advise those who depend on APC for it's opcode caching to test their code with the upcoming built-in opcode cache, and feed back any issues encountered to ensure a stable final release.

I do not know what this means for the future of APC.

APC FOR PHP 5.4+ IS STILL FLAGGED AS BETA

This means the developers do not consider it completely stable. While many people are experiencing no problems at all with the current SVN releases, there is still the odd report of edge cases from people under certain configurations, or under heavy load.

As with everything you would want to use in a production environment, make sure you thoroughly test any release (beta or stable) in development or pre-production environments first. This includes load testing!

As of the 3.1.13 release, commits to the SVN repository have slowed down somewhat and the bug list doesn't have that many recent additions. Make of that what you will.

On 10 December 2012 21:05, Rasmus Lerdorf wrote:

APC is at the point now for 5.4 where I don't think there are any more edge cases than we have in 5.3. Neither is perfect, but it is close enough for the majority of sites.

Anyone with C / gdb skills and some free time is urged to gloss over the bug list and see if they can fix anything, or improve this free open source product that we all rely on.

Alternative solutions exist, Wikipedia provides a list of PHP accelerators.

On the 13th of February 2013, Zeev Suraski announced the availability of the Zend Optimizer+ source code.

There has been quite a lengthy discussion about integrating Zend Optimizer+ into the PHP core in the next major version (the version after 5.5). People may wish to familiarise themselves with Zend Optimizer+ in advance, should this be the case.

Do not use APC 3.1.14

APC 3.1.14 has been removed from PECL downloads due to some serious memory issues that have been discovered but have not yet been tracked down.

If you're already using 3.1.14, you may wish to downgrade until 3.1.15 is released. Remember, this is still beta. If you are using it at all, you are using it at your own risk.

2013-01-02:
~~APC 3.1.14 is available~~, adding PHP 5.5 compatibility, in addition to resolving a fair number of other bugs.

Still beta

2012-09-03:
APC 3.1.13 is available, fixing a number of segfaults.

^{2012-08-16:

An APC 3.1.12 tag has been created, but is still marked as beta, its available on the APC PECL page, as well as the changelog.}
^{Lots of bin_dump related bugs fixed this time around.}

^{2012-07-19:

An APC 3.1.11 tag has been created, but is still marked as beta, its available on the APC PECL page, as well as the changelog. I've been following the relevant mailing lists, and they are still actively working on fixing APC bugs however it is a complex module and not many people seem to be up to the task. This release fixes the nasty stat=0 bugs when including files.}

^{2012-04-11:

An APC 3.1.10 tag was created today, and a beta release of 3.1.10 was placed on the APC PECL page}
^{The changelog states:}

Add PHP 5.4 support (Dmitry, Anatoliy, Pierre)
^{_{Fixed bug #22679: Fix apc_bin_dump for constants. Use IS_CONSTANT_TYPE_MASK to handle all the constants, including the unqalified ones (instead of ~IS_CONSTANT_INDEX check)}}
^{_{Fixed bug #23822, php crashes on apache restart}}

Question 6

As I've investigated I should set xdebug.remote_autostart=0 See documentation: http://xdebug.org/docs/remote

Important! You should change this value through php.ini. Using function ini_set('xdebug.remote_autostart', 0) won't work because sesion has already started and you'll be still getting xdebug information to your remote host.

How to disable XDebug

Answers

Zend OPCache included in PHP 5.5

APC FOR PHP 5.4+ IS STILL FLAGGED AS BETA

Do not use APC 3.1.14

php,xdebug,apc