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  1. <?php
  2.  
  3. $string = "★ This is some text ★";
  4. $first = preg_replace_callback('/[\x{80}-\x{10FFFF}]/u', function ($m) {
  5.     $char = current($m);
  6.     $utf = iconv('UTF-8', 'UCS-4', $char);
  7.     return sprintf("&#x%s;", ltrim(strtoupper(bin2hex($utf)), "0"));
  8. }, $string);
  9.  
  10. echo $first;
  11.  
Success #stdin #stdout 0.02s 52504KB
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stdin
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Standard input is empty
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&#x2605; This is some text &#x2605;
https://ideone.com/BEAILc
language:
PHP (php 7.3.5)
created:
8 years ago
visibility:
secret

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