Use get_error_handler() when you need to returns the currently registered user error handler, if supported by the PHP version in a PHP application. The examples below show the actual operation and its limitations.
What Is get_error_handler() in PHP?
Returns the currently registered user error handler, if supported by the PHP version. The exact signature supported by your installation depends on its PHP version and enabled extensions.
Its syntax is:
get_error_handler( /* parameters depend on the required extension and PHP version */ )Availability: This function is not available in every PHP build. Install or enable the required extension or check the PHP version before using it.
Example 1: Basic Usage
<?php
if (function_exists("get_error_handler")) var_dump(get_error_handler() === null); else echo "Unsupported PHP version";Result: Run the example in an environment that supports the function. Any values depending on operating-system state, installed extensions, process configuration, or network access must be checked on the target server.
Example 2: Different Input or Behavior
<?php
if (function_exists("get_error_handler")) echo is_callable(get_error_handler()) ? "Custom handler" : "Default handler";Result: Run the example in an environment that supports the function. Any values depending on operating-system state, installed extensions, process configuration, or network access must be checked on the target server.
Practical Example: Applying the Function
<?php
$handlerState = function_exists("get_error_handler") ? get_error_handler() : null; echo $handlerState === null ? "No custom handler" : "Custom handler installed";Result: Run the example in an environment that supports the function. Any values depending on operating-system state, installed extensions, process configuration, or network access must be checked on the target server.
Important Behavior and Edge Cases
Check PHP-version availability; callbacks can be closures or method references.
Comparison With Related Functions
| Approach | Difference |
|---|---|
get_error_handler() | Returns the currently registered user error handler, if supported by the PHP version. |
| Related operation | set_error_handler() installs a handler; get_error_handler() reads the current one. |
Common Beginner Mistakes
| Mistake | Correct Approach |
|---|---|
| Ignoring the function-specific limitation | Check PHP-version availability; callbacks can be closures or method references. |
| Confusing this function with a related operation | set_error_handler() installs a handler; get_error_handler() reads the current one. |
Key Takeaways
- Returns the currently registered user error handler, if supported by the PHP version.
- Check PHP-version availability; callbacks can be closures or method references.
- set_error_handler() installs a handler; get_error_handler() reads the current one.
Use get_error_handler() for the specific operation demonstrated above. Check its prerequisites and handle failure conditions before using it with production data.