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<?php $str = '\xE2\x80\x99'; var_dump(\preg_replace_callback('#\\\\(?:\\\\|x([0-9a-f]{2}))#i', function($m) { return isset($m[1]) ? \chr(\hexdec($m[1])) : '\\'; }, $str));
Output for 5.6.38, 7.0.33, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
string(3) "’"
preferences:
84.2 ms | 1468 KiB | 4 Q