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<h2 class="title">About debugging in PHP</h2>
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PHP does not have an internal debugging facility.
You can use one of the external debuggers though. The
<a href="http://www.zend.com/en/products/studio/" class="link external">» Zend IDE</a> includes
a debugger, and there are also some free debugger extensions
like DBG at <a href="http://www.php-debugger.com/dbg/" class="link external">» http://www.php-debugger.com/dbg/</a>, the
<a href="http://pecl.php.net/apd" class="link external">» Advanced PHP Debugger</a> (APD) or
<a href="http://xdebug.org/" class="link external">» Xdebug</a>.
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