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Debugging Your PHP Cake Application

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Jose Diaz-Gonzalez
Jose Diaz-Gonzalez

This document provides tips for debugging PHP Cake applications. It discusses using XDebug to trace code, view context and variable contents using debug() and var_dump(), and prevent errors from breaking production. It recommends using DebugKit, monitoring tools like Redis-live and Varnishstat, and notifying on errors. Verbose logging with sgLogMessage and unifying logs with Logstash are also covered. Finally, it discusses aggregating metrics with Graphite and Statsd.

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Debugging your PHP Cake Application
about n? Developer and Operations at seatgeek.com n? Cake Core - Plugins Site and IRC Troll n? Open Source Contributor (github.com/ josegonzalez)
Trace the
Debugging Your PHP Cake Application
Debugging Your PHP Cake Application
Debugging Your PHP Cake Application
DERP
packages/dl/1/
DERP packages/dl/1/
Debugging Your PHP Cake Application
Showing Context
debug($herp) /app/Controller/PackagesController.php (line 107) 'derp'
debug($herp) /app/Controller/PackagesController.php (line 107) 'derp' class name
debug($herp) /app/Controller/PackagesController.php (line 107) 'derp' line number
debug($herp) /app/Controller/PackagesController.php (line 107) 'derp' the good bits
xdebug apt-get install php5-xdebug # php.ini [xdebug] xdebug.cli_color = 1
var_dump()
overrides var_dump() var_dump
var_dump() type
var_dump() contents
var_dump() length
xdebug_debug_zval
xdebug_debug_zval tight loop goodies
Don¨t Break Production
debug(); die;
debug(); die;
diebug()
diebug()
Show Application State
debug_kit git clone git://github.com/cakephp/debug_kit
debug_kit
debug_kit
debug_kit
debug_kit
etc.
the server is part of the application
SO TREAT IT AS SUCH
redis-live
paramedic
varnishstat
statistics are good
visualization are
Notify on Errors
?rst pass
second pass
third pass
fourth pass
?fth pass?
Verbose Logging
printf
printf no timestamp
printf needs newlines
printf SUCKS
sgLogMessage
sgLogMessage categorization
sgLogMessage auto-out with newlines
sgLogMessage standard date
sgLogMessage stored logs!
logs can never be too VERBOSE
Unify Logging
logstash log-aggregator message parser noti?cation system
logstash
logstash
?logstash? n? Searchable logs n? Aggregate all logs in one place n? Alert, Notify, Create metrics from one place n? Empower your developers
Aggregate Metrics
graphite time-series data graph rendering simple graph url-
graphite does not... alert on data collect data export data https://gist.github.com/
sending stats Statsd::increment(｀seatgeek.www.php.e_warning¨); # sends data to statsd # metrics aggregated # view in your graphite backend
interesting n? check mysql replication length n? track conversions in your app n? expense tracking n? alerting systems
earthquake effects
apc con?guration
Questions?

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Debugging Your PHP Cake Application

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