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2010-04-11T05:27:11.607
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2017-05-23T11:48:44.743
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text
Body
<ol> <li>You want to get your hands on a debug build of <code>mod_php</code> (with symbols) or <a href="http://www.crucialp.com/resources/tutorials/server-administration/apache-2-php-4-5-mod_php-linux-redhat-freebsd-apache2-php4-php5.php" rel="nofollow noreferrer">build your own</a> (<code>configure --enable-debug</code>)</li> <li>You should configure your Apache to always keep exactly one worker process instance up (which will be the instance you debug), that is, set <a href="http://httpd.apache.org/docs/2.0/mod/prefork.html#minspareservers" rel="nofollow noreferrer"><code>MinSpareServers</code></a>, <a href="http://httpd.apache.org/docs/2.0/mod/prefork.html#maxspareservers" rel="nofollow noreferrer"><code>MaxSpareServers</code></a> and <a href="http://httpd.apache.org/docs/2.0/mod/mpm_common.html#startservers" rel="nofollow noreferrer"><code>StartServers</code></a> all to 1. Also make sure any timeout parameters are generously set</li> <li><a href="http://www-inst.eecs.berkeley.edu/~cs61c/resources/gdb5-refcard.pdf" rel="nofollow noreferrer">Use <code>gdb</code></a> or <a href="https://stackoverflow.com/questions/79023/c-gdb-gui">any graphical interface to <code>gdb</code></a> (such as <a href="http://www.gnu.org/software/ddd/" rel="nofollow noreferrer"><code>ddd</code></a> or <a href="http://www.eclipse.org/cdt/" rel="nofollow noreferrer">Eclipse CDT</a>) to attach to the one and only Apache worker process. Stick a breakpoint in one of the PHP sources etc. and continue.</li> <li>Point your browser to your webserver and access a PHP page. Your breakpoint will trigger. If you want to wake the debugger at a particular point in your PHP script execution, generate a <code>SIGTRAP</code> from PHP and <code>gdb</code> will normally oblige you.</li> </ol> <p>Have fun!</p>
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