php-doc-en/appendices/debugger.xml

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 <appendix xml:id="debugger" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
  <title>Debugging in PHP</title>

  <sect1 xml:id="debugger-about">
   <title>About debugging in PHP</title>
   <simpara>
    PHP is shipped with the <link linkend="migration56.new-features.phpdbg">phpdbg</link> interactive debugger. 
    External debuggers can also be used. The
    <link xlink:href="&url.zend.ide;">Zend IDE</link> includes
    a debugger, and there are also some free debugger extensions
    like DBG at <link xlink:href="&url.dbg;">&url.dbg;</link>, the 
    <link xlink:href="&url.apd;">Advanced PHP Debugger</link> (APD) or
    <link xlink:href="&url.xdebug;">Xdebug</link>.
   </simpara>
  </sect1>

 </appendix>

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