Returns the active call stack as an array of frames with function, file, line and optionally arguments.
What It Does
debug_print_backtrace() returns no array and prints directly Avoid exposing stack traces and arguments to web users; DEBUG_BACKTRACE_IGNORE_ARGS omits argument values.
Requirements and Compatibility
Available in the PHP runtime; use PHP 8 or later for the shown typed, modern examples.
Syntax, Inputs and Results
The arguments shown below are concrete values for this function; their types and ranges matter. The example checks return data rather than assuming that every operation succeeds.
Example 1: Basic Use
Demonstrates the primary behavior.
<?php
function controller(): array { return debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 4); }
print_r(controller());Example 2: Another Case
Handles an alternative input or use case.
<?php
function entry(): void { helper(); }
function helper(): void {
foreach (debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 3) as $frame) {
echo $frame['function'] ?? '{main}', "\n";
}
}
entry();Practical Example
Puts the function into a larger practical task.
<?php
function callerName(): string {
$frames = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 2);
return $frames[1]['function'] ?? 'global';
}
function buildReport(): void { echo callerName(), "\n"; }
buildReport();For production, apply the compatibility and edge-case limits described below.
Important Behavior and Edge Cases
Avoid exposing stack traces and arguments to web users; DEBUG_BACKTRACE_IGNORE_ARGS omits argument values.
Comparison with Related Functions and Tools
| Subject | Key difference |
|---|---|
| debug_backtrace() | debug_print_backtrace() returns no array and prints directly |
Common Beginner Mistakes
| Mistake | Correct approach |
|---|---|
| Calling debug_backtrace() without its required input or supported extension | Check the extension, supply valid arguments, and handle false or exceptions according to the function. |
| Assuming debug_backtrace() guarantees a valid or safe image | Inspect the return and avoid exposing debug output to website visitors. |
| Confusing the operation with a related API | debug_print_backtrace() returns no array and prints directly |
Key Takeaways
- Returns the active call stack as an array of frames with function, file, line and optionally arguments.
- Avoid exposing stack traces and arguments to web users; DEBUG_BACKTRACE_IGNORE_ARGS omits argument values.
- Choose the companion API described in the comparison table when the job differs.
Use these examples as a starting point, then validate the result with the actual PHP build, dependencies and inputs used by your application.