I'm using PhpStorm version 8.0.4, server is Debian Wheeze with PHP 5.4.4 and Xdebug 2.1.1.
On PhpStorm I have two projects. Debug on project A works fine, the debugger stops at at breakpoint and I'm able to watch variables and step into functions.
On project B, which has the same debugging configuration of project A, the debugger does not stop at breakpoints.
Both project are stored in the same server, with the same Apache, PHP and Xdebug configuration. They only use different virtual hosts. The only differences I have encountered is that on project A PhpStorm sets the cookie XDEBUG_SESSION on the browser with the IDE key, but on project B the cookie is not set.
Next is a sample debug session on project B:
Log opened at 2015-08-25 07:01:36
I: Checking remote connect back address.
I: Remote address found, connecting to <CLIENT IP>:9000.
I: Connected to client. :-)
-> <init xmlns="urn:debugger_protocol_v1" xmlns:xdebug="http://xdebug.org/dbgp/xdebug" fileuri="file:///var/www/projectB/script.php" language="PHP" protocol_version="1.0" appid="3137"><engine version="2.2.1"><![CDATA[Xdebug]]></engine><author><![CDATA[Derick Rethans]]></author><url><![CDATA[http://xdebug.org]]></url><copyright><![CDATA[Copyright (c) 2002-2012 by Derick Rethans]]></copyright></init>
<- feature_set -i 1 -n show_hidden -v 1
-> <response xmlns="urn:debugger_protocol_v1" xmlns:xdebug="http://xdebug.org/dbgp/xdebug" command="feature_set" transaction_id="1" feature="show_hidden" success="1"></response>
<- feature_set -i 2 -n max_depth -v 1
-> <response xmlns="urn:debugger_protocol_v1" xmlns:xdebug="http://xdebug.org/dbgp/xdebug" command="feature_set" transaction_id="2" feature="max_depth" success="1"></response>
<- feature_set -i 3 -n max_children -v 100
-> <response xmlns="urn:debugger_protocol_v1" xmlns:xdebug="http://xdebug.org/dbgp/xdebug" command="feature_set" transaction_id="3" feature="max_children" success="1"></response>
<- status -i 4
-> <response xmlns="urn:debugger_protocol_v1" xmlns:xdebug="http://xdebug.org/dbgp/xdebug" command="status" transaction_id="4" status="starting" reason="ok"></response>
<- step_into -i 5
-> <response xmlns="urn:debugger_protocol_v1" xmlns:xdebug="http://xdebug.org/dbgp/xdebug" command="step_into" transaction_id="5" status="break" reason="ok"><xdebug:message filename="file:///var/www/projectB/script.php" lineno="2"></xdebug:message></response>
<- run -i 6
-> <response xmlns="urn:debugger_protocol_v1" xmlns:xdebug="http://xdebug.org/dbgp/xdebug" command="run" transaction_id="6" status="stopping" reason="ok"></response>
<- stop -i 7
-> <response xmlns="urn:debugger_protocol_v1" xmlns:xdebug="http://xdebug.org/dbgp/xdebug" command="stop" transaction_id="7" status="stopped" reason="ok"></response>
Log closed at 2015-08-25 07:01:36
UPDATE
The server is on a remote machine, i run PHP (and Xdebug) remotely using SSH. Here is a sample script i'm trying to debug:
<?php
$a=1;
$b=2;
$c=$a+$b;
echo "c is: ".$c;
I've a breakpoint on line 2 ($a=1;).
This is the Xdebug log:
Log opened at 2015-08-25 11:06:24
I: Checking remote connect back address.
I: Remote address found, connecting to <CLIENT IP>:9000.
I: Connected to client. :-)
-> <init xmlns="urn:debugger_protocol_v1" xmlns:xdebug="http://xdebug.org/dbgp/xdebug" fileuri="file:///var/www/vhost/test.php" language="PHP" protocol_version="1.0" appid="3602"><engine version="2.2.1"><![CDATA[Xdebug]]></engine><author><![CDATA[Derick Rethans]]></author><url><![CDATA[http://xdebug.org]]></url><copyright><![CDATA[Copyright (c) 2002-2012 by Derick Rethans]]></copyright></init>
<- feature_set -i 1 -n show_hidden -v 1
-> <response xmlns="urn:debugger_protocol_v1" xmlns:xdebug="http://xdebug.org/dbgp/xdebug" command="feature_set" transaction_id="1" feature="show_hidden" success="1"></response>
<- feature_set -i 2 -n max_depth -v 1
-> <response xmlns="urn:debugger_protocol_v1" xmlns:xdebug="http://xdebug.org/dbgp/xdebug" command="feature_set" transaction_id="2" feature="max_depth" success="1"></response>
<- feature_set -i 3 -n max_children -v 100
-> <response xmlns="urn:debugger_protocol_v1" xmlns:xdebug="http://xdebug.org/dbgp/xdebug" command="feature_set" transaction_id="3" feature="max_children" success="1"></response>
<- status -i 4
-> <response xmlns="urn:debugger_protocol_v1" xmlns:xdebug="http://xdebug.org/dbgp/xdebug" command="status" transaction_id="4" status="starting" reason="ok"></response>
<- step_into -i 5
-> <response xmlns="urn:debugger_protocol_v1" xmlns:xdebug="http://xdebug.org/dbgp/xdebug" command="step_into" transaction_id="5" status="break" reason="ok"><xdebug:message filename="file:///var/www/vhost/test.php" lineno="2"></xdebug:message></response>
<- run -i 6
-> <response xmlns="urn:debugger_protocol_v1" xmlns:xdebug="http://xdebug.org/dbgp/xdebug" command="run" transaction_id="6" status="stopping" reason="ok"></response>
<- stop -i 7
-> <response xmlns="urn:debugger_protocol_v1" xmlns:xdebug="http://xdebug.org/dbgp/xdebug" command="stop" transaction_id="7" status="stopped" reason="ok"></response>
Log closed at 2015-08-25 11:06:24
Don't tell me why, but i solved my problem by pressing the "Start listening for PHP Debug Connections" button in the debug menu.