Intro to Xdebug - Speaker Deck

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A minimalists intro to XDEBUG Claudio Mettler, CtrlM Singapore August 2015 1

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xdebug... • ...provides new functions useful for debugging, logging and testing • ...changes the behaviour of some core PHP functionality • ...does proﬁling • ...implements a remote debugging protocol 2

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A word of caution • do not run on live servers (for performance and security reasons) • may cause extreme twitchiness when watching people debug without a debugger 3

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new functions • code coverage analysis • xdebug_call_class(), xdebug_call_ﬁle(), xdebug_call_function(), xdebug_get_headers() • etc. 4

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Modified behaviour • includes a stack trace in error messages • var_dump can do colors now • function nesting limit of 100! • etc. 5

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profiling • creates CacheGrind ﬁles • topic for another talk 8

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remote debugging: Installation • pecl install xdebug • apt-get install php5-xdebug • edit conﬁg:    xdebug.remote_connect_back=1  xdebug.remote_enable=1  9

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remote debugging: IDE SETUP • accept incoming connections • path mapping 10

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remote debugging • set breakpoints • enable listener • start session in browser 11

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live demo 12

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check out the competition • phpdbg: part of PHP now • zend debugger 13

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A little bedtime story 14

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https://speakerdeck.com/claudiomettler/intro-to-xd 18