PHP encodes string in UTF-8. This code converts it to Unicode, and then represent it as hexadecimal.

Change Character Encoding And Represent In Hexadecimal

<?php
function strToHex($string){
    $hex = '';
    for ($i=0; $i<strlen($string); $i++){
        $ord = ord($string[$i]);
        $hexCode = dechex($ord);
        $hex .= substr('0'.$hexCode, -2);
    }
    return $hex;
}

$s = '深圳市南山区南海大道1079号 http://www.gps.com/map.aspx?lat=23.123&lng=113.123';
$s = mb_convert_encoding($s, 'Unicode', 'UTF-8');

echo strToHex($s);