You have a block of code and you want to profile it to see how long each function takes to execute.
Use Xdebug function tracing:
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xdebug_start_trace('/tmp/factorial-trace'); function factorial($x) { return ($x == 1) ? 1 : $x * factorial($x - 1); } print factorial(10); xdebug_stop_trace(); |
The Xdebug extension provides a wide range of helpful debugging and profiling features.
It’s available via PECL or as a prebuilt Windows binary.
Its function-tracing feature provides insight into what functions are called from where, optionally including the arguments passed and returned.
It also records the time and memory taken for each call.
For the factorial example, it generates results such as:
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TRACE START [2015-01-05 06:32:11] 0.0005 240136 -> factorial($x = 10) /factorial.php:9 0.0005 240184 -> factorial($x = 9) /factorial.php:6 0.0005 240256 -> factorial($x = 8) /factorial.php:6 0.0006 240304 -> factorial($x = 7) /factorial.php:6 0.0006 240352 -> factorial($x = 6) /factorial.php:6 0.0006 240400 -> factorial($x = 5) /factorial.php:6 0.0007 240448 -> factorial($x = 4) /factorial.php:6 0.0007 240496 -> factorial($x = 3) /factorial.php:6 0.0007 240544 -> factorial($x = 2) /factorial.php:6 0.0008 240592 -> factorial($x = 1) /factorial.php:6 >=> 1 >=> 2 >=> 6 >=> 24 >=> 120 >=> 720 >=> 5040 >=> 40320 >=> 362880 >=> 3628800 0.0010 240136 -> xdebug_stop_trace() /factorial.php:12 0.0010 240176 TRACE END [2015-01-05 06:32:11] |
The first column lists the start time in seconds. The next column has the memory usage.
Then you see the function called, along with the argument passed. Finally, it lists the filename and line number.
As the functions execute, you see the data returned from each one.
Xdebug allows you to format these results in a number of ways. This specific output format uses the following configuration parameters:
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xdebug.trace_format=0 ; human readable plain text xdebug.collect_params=4 ; full variable contents and variable name. xdebug.collect_return=1 ; show return values |
Xdebug’s function profiling provides an easy way to get a detailed overview of everything going on in a section of code.
However, there are times when this may be more granular than you need.
