Gets or sets the comma-separated file suffixes used by the default SPL autoloader.
What It Does
Composer PSR-4 autoloading supplies a project-level class map It does not configure Composer and has no effect on custom PSR-4 loaders.
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
echo spl_autoload_extensions(), "\n";Example 2: Another Case
Handles an alternative input or use case.
<?php
$old = spl_autoload_extensions();
spl_autoload_extensions('.class.php,.php');
echo spl_autoload_extensions(), "\n";
spl_autoload_extensions($old);Practical Example
Puts the function into a larger practical task.
<?php
$suffixes = explode(',', spl_autoload_extensions());
foreach ($suffixes as $suffix) echo trim($suffix), "\n";For production, apply the compatibility and edge-case limits described below.
Important Behavior and Edge Cases
It does not configure Composer and has no effect on custom PSR-4 loaders.
Comparison with Related Functions and Tools
| Subject | Key difference |
|---|---|
| spl_autoload_extensions() | Composer PSR-4 autoloading supplies a project-level class map |
Common Beginner Mistakes
| Mistake | Correct approach |
|---|---|
| Calling spl_autoload_extensions() without its required input or supported extension | Check the extension, supply valid arguments, and handle false or exceptions according to the function. |
| Assuming spl_autoload_extensions() guarantees a valid or safe image | Inspect the return and avoid exposing debug output to website visitors. |
| Confusing the operation with a related API | Composer PSR-4 autoloading supplies a project-level class map |
Key Takeaways
- Gets or sets the comma-separated file suffixes used by the default SPL autoloader.
- It does not configure Composer and has no effect on custom PSR-4 loaders.
- 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.