Prints the current PHP call stack directly to output; it does not return the stack array.
What It Does
debug_backtrace() returns frames as data Use DEBUG_BACKTRACE_IGNORE_ARGS when sensitive values could occur in arguments.
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 outer(): void { inner(); }
function inner(): void { debug_print_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 3); }
outer();Example 2: Another Case
Handles an alternative input or use case.
<?php
function processOrder(int $orderId): void { debug_print_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS); }
processOrder(37);Practical Example
Puts the function into a larger practical task.
<?php
ob_start();
function route(): void { debug_print_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 2); }
route();
$trace = ob_get_clean();
error_log($trace);For production, apply the compatibility and edge-case limits described below.
Important Behavior and Edge Cases
Use DEBUG_BACKTRACE_IGNORE_ARGS when sensitive values could occur in arguments.
Comparison with Related Functions and Tools
| Subject | Key difference |
|---|---|
| debug_print_backtrace() | debug_backtrace() returns frames as data |
Common Beginner Mistakes
| Mistake | Correct approach |
|---|---|
| Calling debug_print_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_print_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_backtrace() returns frames as data |
Key Takeaways
- Prints the current PHP call stack directly to output; it does not return the stack array.
- Use DEBUG_BACKTRACE_IGNORE_ARGS when sensitive values could occur in arguments.
- 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.