Installing xdebug with PHP 5.5

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I've read quite a lot answers but couldn't figure out why xdebug doesn't work.

php.ini: 

[xdebug]
zend_extension="/usr/lib/php5/20090626/xdebug.so"

php -v:

PHP 5.5.6-1+debphp.org~precise+2 (cli) (built: Nov 21 2013 14:31:41) 
Copyright (c) 1997-2013 The PHP Group
Zend Engine v2.5.0, Copyright (c) 1998-2013 Zend Technologies
    with Zend OPcache v7.0.3-dev, Copyright (c) 1999-2013, by Zend Technologies

/usr/lib/php5/20090626/xdebug.so does exist. No zend optimizer in php.ini.

Also if I try to install xdebug:

pecl/xdebug is already installed and is the same as the released version 2.2.3
install failed

Thanks in advance.

xdebug php
6 Answers

To install a very specific version of Xdebug for a specific version of PHP you can do it by compilation from sources. E.g. if you would like to compile xdebug-2.5.5 for PHP 5.6 run following commands in console (Ubuntu):

sudo apt install php5.6-dev
cd ~/Downloads
wget "https://xdebug.org/files/xdebug-2.5.5.tgz" -O "xdebug-2.5.5.tgz"
tar -xzf xdebug-2.5.5.tgz
cd xdebug-2.5.5/
/usr/bin/phpize5.6
./configure --enable-xdebug --with-php-config=/usr/bin/php-config5.6
make
sudo make install

All available versions of Xdebug can be found here. Xdebug compilation guide is here.

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