PHP mb_language() Function: Usage and Examples

When working with PHP, you may need to read or change the mbstring language setting. This guide explains the operation, shows what its arguments mean, and uses three separate examples to make the result easier to understand.

mb_language: This language setting influences selected mail and encoding behaviors; it does not translate arbitrary text.

What Is mb_language in PHP?

Read or change the mbstring language setting. This language setting influences selected mail and encoding behaviors; it does not translate arbitrary text.

Syntax:

mb_language(?string $language = null): string|bool

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: Do not confuse the mbstring language setting with an ICU locale or the visitor interface language.

Example 1: Basic Usage

This example introduces the operation with a short and predictable input.

<?php

echo mb_language();

The code focuses on the main operation. This language setting influences selected mail and encoding behaviors; it does not translate arbitrary text.

Example 2: Another Case

Now compare a different input, locale, date, or option to see another part of the behavior.

<?php

$previous = mb_language();
mb_language("English");
echo mb_language();
mb_language($previous);

What changes? Do not confuse the mbstring language setting with an ICU locale or the visitor interface language.

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

$previousLanguage = mb_language();
try {
    mb_language("English");
    echo "Mail language mode: " . mb_language();
} finally {
    mb_language($previousLanguage);
}

The practical example demonstrates how to apply this operation to multiple values, a reusable task, or a validated input. This language setting influences selected mail and encoding behaviors; it does not translate arbitrary text.

Important Behavior and Edge Cases

• Core behavior: This language setting influences selected mail and encoding behaviors; it does not translate arbitrary text.
• Inputs and results: Do not confuse the mbstring language setting with an ICU locale or the visitor interface language.
• Alternatives: Locale::setDefault() configures ICU locale behavior rather than mbstring mail language.
• Compatibility: mbstring is required for mb_* functions.

Comparison With Related Functions

Common Beginner Mistakes

Key Takeaways

• mb_language helps you read or change the mbstring language setting.
• This language setting influences selected mail and encoding behaviors; it does not translate arbitrary text.
• Do not confuse the mbstring language setting with an ICU locale or the visitor interface language.

Use mb_language when you need to read or change the mbstring language setting. 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.