appendices/debugger.xml
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<sect1 xml:id="debugger-about">
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<title>About debugging in PHP</title>
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<simpara>
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PHP 5.6 is shipped with the <link linkend="migration56.new-features.phpdbg">phpdbg interactive debugger</link>.
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PHP versions below 5.6 do not have an internal debugging facility though.
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You can use one of the external debuggers though. The
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<link xlink:href="&url.zend.ide;">Zend IDE</link> includes
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a debugger, and there are also some free debugger extensions
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like DBG at <link xlink:href="&url.dbg;">&url.dbg;</link>, the
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<link xlink:href="&url.apd;">Advanced PHP Debugger</link> (APD) or
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<link xlink:href="&url.xdebug;">Xdebug</link>.
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PHP is shipped with a basic command line interactive debugger,
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<link linkend="migration56.new-features.phpdbg">phpdbg</link>.
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</simpara>
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<simpara>
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Most IDEs have support for <link xlink:href="&url.xdebug;">Xdebug</link>,
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a free debug tool, which allows for single step debugging your PHP
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applications.
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</simpara>
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</sect1>
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