PHP verify mobile phone number (supports location query and encoding as UTF8)_PHP tutorial

//Mobile phone number verification
function checkMobileValidity($mobilephone) {
$exp = "/^13[0-9]{1}[0-9]{8}$|15[012356789]{1}[0-9]{8}$|18[012356789] {1}[0-9]{8}$|14[57]{1}[0-9]$/";
if(preg_match($exp,$mobilephone)){
return true;
}else{
return false;
}
}
//Mobile phone number location (return: such as Guangdong Mobile)
function checkMobilePlace($mobilephone){
$ url = "http://tcc.taobao.com/cc/json/mobile_tel_segment.htm?tel=".$mobilephone."&t=".time();
$content = file_get_contents($url);
$p = substr($content, 56, 4);
$mo = substr($content, 81, 4);
return $str = conv2utf8($p).conv2utf8($mo);
}
// Convert string encoding to UTF8
function conv2utf8($text){
return mb_convert_encoding($text,'UTF-8','ASCII,GB2312,GB18030,GBK,UTF -8');
}