How to Convert Unicode Codepoints to UTF-8 in PHP?

Converting Unicode Codepoints to UTF-8 in PHP

Unicode codepoints represent individual characters as numeric values, often prefixed with "U ". These codepoints need to be converted into the appropriate UTF-8 encoding to display or store the characters correctly.

Problem Statement:

Given a string of Unicode codepoints in the format "U XXXX" (e.g., "U 597D"), the task is to convert them to their corresponding UTF-8 characters.

Solution:

The recommended approach is to use the following PHP code:

$utf8string = html_entity_decode(preg_replace("/U\+([0-9A-F]{4})/", "&#x\1;", $string), ENT_NOQUOTES, 'UTF-8');

Explanation:

• preg_replace: Replaces all occurrences of Unicode codepoints with HTML entity codes.
• html_entity_decode: Decodes the HTML entities, converting them into their UTF-8 character equivalents.
• ENT_NOQUOTES: Specifies that double quotes should not be converted to HTML entities.
• UTF-8: The target character set for the conversion.

This approach effectively converts Unicode codepoints into UTF-8 characters, enabling their correct display or processing in PHP applications.

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