When working with PHP, you may need to convert a Unicode code point into a character. This guide explains the operation, shows what its arguments mean, and uses three separate examples to make the result easier to understand.
mb_chr: Code points identify Unicode characters; their encoded byte sequences vary with the target encoding.
What Is mb_chr in PHP?
Convert a Unicode code point into a character. Code points identify Unicode characters; their encoded byte sequences vary with the target encoding.
Syntax:
mb_chr(int $codepoint, ?string $encoding = null): string|false
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: The argument must be a supported code point. Always check a false return when using values from external input.
Example 1: Basic Usage
This example introduces the operation with a short and predictable input.
<?php
echo mb_chr(65, "UTF-8");
The code focuses on the main operation. Code points identify Unicode characters; their encoded byte sequences vary with the target encoding.
Example 2: Another Case
Now compare a different input, locale, date, or option to see another part of the behavior.
<?php
echo mb_chr(0x20AC, "UTF-8");
What changes? The argument must be a supported code point. Always check a false return when using values from external input.
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
$codepoints = [0x41, 0x2665, 0x1F30D];
foreach ($codepoints as $codepoint) {
echo mb_chr($codepoint, "UTF-8");
}
The practical example demonstrates how to apply this operation to multiple values, a reusable task, or a validated input. Code points identify Unicode characters; their encoded byte sequences vary with the target encoding.
Important Behavior and Edge Cases
- Core behavior: Code points identify Unicode characters; their encoded byte sequences vary with the target encoding.
- Inputs and results: The argument must be a supported code point. Always check a false return when using values from external input.
- Alternatives: mb_ord() converts an encoded character back into its Unicode code point.
- Compatibility: mbstring is required for mb_* functions.
Comparison With Related Functions
| Function or Approach | When to Use It |
|---|---|
mb_chr | Convert a unicode code point into a character. |
| Related PHP approach | mb_ord() converts an encoded character back into its Unicode code point. |
Common Beginner Mistakes
| Mistake | Correct Approach |
|---|---|
| Using an incorrect input or option | The argument must be a supported code point. Always check a false return when using values from external input. |
| Confusing this API with a related operation | mb_ord() converts an encoded character back into its Unicode code point. |
| Assuming output is identical across environments | Check return values and required extensions or versions. mbstring is required for mb_* functions. |
Key Takeaways
- mb_chr helps you convert a Unicode code point into a character.
- Code points identify Unicode characters; their encoded byte sequences vary with the target encoding.
- The argument must be a supported code point. Always check a false return when using values from external input.
Use mb_chr when you need to convert a Unicode code point into a character. 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.