To trace the execution sequence of PHP functions: Install and configure the xdebug extension. Append the @ sign to the function you want to trace. View the trace.xdebug file generated in the specified output directory, which contains a detailed report of the function call sequence, parameters, and execution duration.
How to trace the execution sequence of PHP functions
Tracing the execution sequence of PHP functions is useful when debugging and understanding code logic. Because PHP is loosely typed and allows dynamic calls, it is sometimes difficult to manually trace the execution flow.
Using the xdebug extension, we can easily trace the execution order of functions and see the actual parameters passed to them.
Install and configure xdebug
sudo apt install php-xdebug
(Ubuntu) or pecl install xdebug
(Other systems)zend_extension=xdebug.so
xdebug.trace_output_dir = /tmp
Trigger tracing
To trigger tracing, you can append @ to the function to be traced
symbol, as shown below:
function foo() { echo "This is foo\n"; } function bar() { echo "This is bar\n"; } function main() { // 跟踪 foo 和 bar 的执行 @foo(); @bar(); }
View trace
After triggering the trace, you can log in the specified output directory (/tmp
Find a trace.xdebug
file in the example). This file contains a detailed report listing the order of function calls, the actual arguments passed to them, and the execution duration of each function.
Practical Case
Suppose you have a complex code where function A calls function B, which in turn calls function C. You want to see the order in which the functions are executed and the arguments passed to each function.
You can trigger xdebug tracing by adding the @
symbol to a function call. Looking at the trace.xdebug
file, you will see the following output:
[21] -> /path/to/file.php [22] >> function main() { [24] -> /path/to/file.php:25 [25] >> function A() { [...]
The output shows the order in which the functions are executed, starting with main
and ending with A
call. You can also view the parameters passed to each function.
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