In PHP, locale_accept_from_http() helps with runtime and application data. Uses the intl extension to negotiate a locale from an HTTP Accept-Language header.
What Is locale_accept_from_http() in PHP?
The function or method has a specific purpose: Uses the intl extension to negotiate a locale from an HTTP Accept-Language header. The following examples show the main call, one additional situation, and an application-style use.
Syntax:
<?php
locale_accept_from_http(...)
Parameters and Return Value
Availability: This API requires its PHP extension or supported runtime version. The syntax in the examples uses the documented PHP API; check the extension installed in your deployment.
Example 1: Basic Usage
Uses the intl extension to negotiate a locale from an HTTP Accept-Language header.
<?php
$localeChoice = locale_accept_from_http("en-US,en;q=0.8,fr;q=0.5");
var_dump($localeChoice);
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
$preferred = locale_accept_from_http("fr-CA,fr;q=0.9,en;q=0.7");
echo $preferred === false ? "Unknown" : $preferred;
The second example focuses on a different input or failure condition, so the behavior can be distinguished from the basic case.
Practical Example
<?php
$headerValue = $_SERVER["HTTP_ACCEPT_LANGUAGE"] ?? "en";
$selected = locale_accept_from_http(substr($headerValue, 0, 255));
echo $selected === false ? "en" : $selected;
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
- Uses the intl extension to negotiate a locale from an HTTP Accept-Language header.
- 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 |
|---|---|
| locale_accept_from_http | Uses the intl extension to negotiate a locale from an HTTP Accept-Language header. |
| function_exists | Checks that a PHP function name is available; does not perform this operation. |
Common Beginner Mistakes
| Mistake | Correct Approach |
|---|---|
| Ignoring errors from locale_accept_from_http | 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
- Uses the intl extension to negotiate a locale from an HTTP Accept-Language header.
- 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.
Uses the intl extension to negotiate a locale from an HTTP Accept-Language header. Use this approach when its capabilities and constraints match the application. Handle invalid data, failure conditions and resource cleanup explicitly.