PHP method to convert Chinese to unicode

Related function description:

iconv command is used to convert the encoding of the file. For example, it can convert UTF8 encoding to GB18030 encoding, and vice versa.

str_split() Function splits a string into an array.

bin2hex() Function converts a string of ASCII characters to a hexadecimal value. Strings can be converted back using the pack() function.

hexdec() Function converts a hexadecimal number into a decimal number.

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Examples are as follows:

/**
 * $str 原始中文字符串
 * $encoding 原始字符串的编码，默认GBK
 * $prefix 编码后的前缀，默认"&#"
 * $postfix 编码后的后缀，默认";"
 */
function unicode_encode($str, $encoding = 'GBK', $prefix = '&#', $postfix = ';') {
    $str = iconv($encoding, 'UCS-2', $str);
    $arrstr = str_split($str, 2);
    $unistr = '';
    for($i = 0, $len = count($arrstr); $i < $len; $i++) {
        $dec = hexdec(bin2hex($arrstr[$i]));
        $unistr .= $prefix . $dec . $postfix;
    }
    return $unistr;
}

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