How to know the xdebug version i have installed? - xdebug

Question

how to know the xdebug version i have installed?
Regards
Javi

Answer 1

php -v command output includes information about installed XDebug version:
$ php -v
PHP 5.6.13-1+deb.sury.org~trusty+3 (cli)
Copyright (c) 1997-2015 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2015 Zend Technologies
with Zend OPcache v7.0.6-dev, Copyright (c) 1999-2015, by Zend Technologies
with Xdebug v2.3.2, Copyright (c) 2002-2015, by Derick Rethans
or
$ php -v | grep -i "xdebug"

Answer 2

You should be able to do it with a simple test script:
<?php
phpinfo();
?>
And get output like this:

Answer 3

On Debian-based distros such as Ubuntu:
aptitude show php5-xdebug | grep Version
On Redhat-based distros such as CentOS:
yum info php-pecl-xdebug | grep Version

Answer 4

I like using
php -r "var_dump(phpversion('xdebug'));"
from command line

Answer 5

From within PHP, use phpversion:
$version = phpversion('xdebug'); // "2.5.5"
Xdebug uses PHP-standardized version string format, so you can use version_compare on it:
if (version_compare('2.6.0.dev', $version, '<=')) {
echo 'You are running at least the development version 2.6.0 of Xdebug';
}

Answer 6

[F.Y.I.] To detect whether xdebug is v3 or not by mashing up the #daniel and #bishop's answer.
php -r "exit(version_compare('3.0',phpversion('xdebug'),'>=')?1:0);"; echo $?
Useful for shell scripts in Dockerfiles and/or CIs.
#!/bin/sh
# bash compatible
if php -r "exit(version_compare('3.0',phpversion('xdebug'),'>=')?1:0);"; then
echo 'if xdebug3 then rewrite php.ini, downgrade, and etc.'
fi
I needed this since I got the below error while running PHPUnit.
Fatal error: Uncaught RuntimeException: Error #2: Use of undefined constant XDEBUG_CC_UNUSED - assumed 'XDEBUG_CC_UNUSED' (this will throw an Error in a future version of PHP) on line 56 in file /workspaces/Sample/vendor/phpunit/php-code-coverage/src/Driver/Xdebug.php in /workspaces/Sample/tests/TestCase.php on line 9
Ref:
Xdebug 3.0.0 is out! # xdebug.org
Upgrading from Xdebug 2 to 3 # xdebug.org