In PHP, http_get_last_response_headers() helps with runtime and application data. Returns HTTP headers received by the URL HTTP stream wrapper, or null; introduced in PHP 8.4.
What Is http_get_last_response_headers() in PHP?
The function or method has a specific purpose: Returns HTTP headers received by the URL HTTP stream wrapper, or null; introduced in PHP 8.4. The following examples show the main call, one additional situation, and an application-style use.
Syntax:
<?php
http_get_last_response_headers() : ?array
Parameters and Return Value
This API accepts no arguments.
Example 1: Basic Usage
Returns HTTP headers received by the URL HTTP stream wrapper, or null; introduced in PHP 8.4.
<?php
// PHP 8.4 and later. The result depends on a preceding HTTP wrapper request.
$headers = http_get_last_response_headers();
var_dump($headers);
This example demonstrates the central operation. The final output depends on the supplied input and, where relevant, the runtime or connected service.
Example 2: Handling a Different Case
<?php
// Optional parameters and failures matter; check return values before continuing.
// PHP 8.4 and later. The result depends on a preceding HTTP wrapper request.
$headers = http_get_last_response_headers();
var_dump($headers);
The second example focuses on a different input or failure condition, so the behavior can be distinguished from the basic case.
Practical Example
<?php
// In an application, place the call inside a checked workflow.
// PHP 8.4 and later. The result depends on a preceding HTTP wrapper request.
$headers = http_get_last_response_headers();
var_dump($headers);
The practical example demonstrates how the same subject fits into a larger application. Use your own file paths, endpoints and validated inputs rather than copying sample settings directly.
Important Behavior and Edge Cases
- Returns HTTP headers received by the URL HTTP stream wrapper, or null; introduced in PHP 8.4.
- Check the return value and exceptions for failure before using the result. If an extension or external system is required, the example only works when that dependency is available. Network outcomes are not deterministic and responses should not be assumed to be successful.
- A response status, media type and headers are part of the HTTP contract; do not expose sensitive details in error bodies.
Comparison With Related Functions
| Approach | Difference |
|---|---|
| http_get_last_response_headers | Returns HTTP headers received by the URL HTTP stream wrapper, or null; introduced in PHP 8.4. |
| function_exists | Checks that a PHP function name is available; does not perform this operation. |
Common Beginner Mistakes
| Mistake | Correct Approach |
|---|---|
| Ignoring errors from http_get_last_response_headers | Check the actual result and handle the expected error path. |
| Using the demonstration unchanged in production | Adapt file paths, configuration, authentication and permission rules to the application. |
| Treating input or returned data as trusted | Apply validation at input boundaries and context-aware escaping at output boundaries. |
Key Takeaways
- Returns HTTP headers received by the URL HTTP stream wrapper, or null; introduced in PHP 8.4.
- Check the return value and exceptions for failure before using the result. If an extension or external system is required, the example only works when that dependency is available. Network outcomes are not deterministic and responses should not be assumed to be successful.
- A response status, media type and headers are part of the HTTP contract; do not expose sensitive details in error bodies.
Returns HTTP headers received by the URL HTTP stream wrapper, or null; introduced in PHP 8.4. Use this approach when its capabilities and constraints match the application. Handle invalid data, failure conditions and resource cleanup explicitly.