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148.96 ms | 1398 KiB | 7 Q<?php
$str = '回';echo urlencode($str);
echo $bin = pack("C3", ord($str{0}), ord($str{1}), ord($str{2}));//回
$hex = strtoupper(bin2hex($bin));
echo "UTF-8编码: " . $hex . "\n";
$byte1 = ord($str{0});
$byte2 = ord($str{1});
$byte3 = ord($str{2});
$c1 = (($byte1 & 0x0F) << 4) | (($byte2 & 0x3F) >> 2);
$c2 = (($byte2 & 0x03) << 6) | ($byte3 & 0x3F);
$dec = (($c1 & 0x00FF) << 8) | $c2;
echo "Unicode编码: " . $dec . "\n";