When working with PHP, you may need to read the primary language subtag. This guide explains the operation, shows what its arguments mean, and uses three separate examples to make the result easier to understand.
Locale::getPrimaryLanguage: The language subtag names the language independently of region and script subtags.
What Is Locale::getPrimaryLanguage in PHP?
Read the primary language subtag. The language subtag names the language independently of region and script subtags.
Syntax:
Locale::getPrimaryLanguage(string $locale): ?string
Parameters and return value: The signature above identifies the arguments and return type where the API has a single call. For topic guides, follow the sequence of calls in the examples. Always distinguish a returned value from an object or variable modified by reference.
Important: A language subtag is not enough to identify regional formatting conventions.
Example 1: Basic Usage
This example introduces the operation with a short and predictable input.
<?php
echo Locale::getPrimaryLanguage("en_US");
The code focuses on the main operation. The language subtag names the language independently of region and script subtags.
Example 2: Another Case
Now compare a different input, locale, date, or option to see another part of the behavior.
<?php
echo Locale::getPrimaryLanguage("zh_Hant_TW");
What changes? A language subtag is not enough to identify regional formatting conventions.
Practical Example: Applying It in an Application
Use the following separate example as a starting point for a small application task. Check any extension or environment requirements below before running it.
<?php
$localeCodes = ["fr_CA", "fr_FR", "de_DE"];
foreach ($localeCodes as $code) {
echo $code . " => " . Locale::getPrimaryLanguage($code) . PHP_EOL;
}
The practical example demonstrates how to apply this operation to multiple values, a reusable task, or a validated input. The language subtag names the language independently of region and script subtags.
Important Behavior and Edge Cases
- Core behavior: The language subtag names the language independently of region and script subtags.
- Inputs and results: A language subtag is not enough to identify regional formatting conventions.
- Alternatives: Locale::getRegion() reads the region portion and Locale::parseLocale() returns the full component map.
- Compatibility: The intl extension is required.
Comparison With Related Functions
| Function or Approach | When to Use It |
|---|---|
Locale::getPrimaryLanguage | Read the primary language subtag. |
| Related PHP approach | Locale::getRegion() reads the region portion and Locale::parseLocale() returns the full component map. |
Common Beginner Mistakes
| Mistake | Correct Approach |
|---|---|
| Using an incorrect input or option | A language subtag is not enough to identify regional formatting conventions. |
| Confusing this API with a related operation | Locale::getRegion() reads the region portion and Locale::parseLocale() returns the full component map. |
| Assuming output is identical across environments | Check return values and required extensions or versions. The intl extension is required. |
Key Takeaways
- Locale::getPrimaryLanguage helps you read the primary language subtag.
- The language subtag names the language independently of region and script subtags.
- A language subtag is not enough to identify regional formatting conventions.
Use Locale::getPrimaryLanguage when you need to read the primary language subtag. Start with the first example, compare the second, and adapt the practical example to your inputs. Confirm the return value and environment requirements before adding it to production code.