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<?php $str = 'Test emoji \U0001F607 \U0001F63C'; echo preg_replace_callback( '/\\\U([A-F0-9]+)/', function ($matches) { return mb_convert_encoding(hex2bin($matches[1]), 'UTF-8', 'UTF-32'); }, $str );
Output for git.master, git.master_jit, rfc.property-hooks
Test emoji 😇 😼

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