1.查找Longitudes与Latitudes之间的距离

functiongetDistanceBetweenPointsNew($latitude1, $longitude1, $latitude2, $longitude2) {‍
$theta = $longitude1 - $longitude2;
$miles = (sin(deg2rad($latitude1)) * sin(deg2rad($latitude2))) + (cos(deg2rad($latitude1)) * cos(deg2rad($latitude2)) * cos(deg2rad($theta)));
$miles = acos($miles);
$miles = rad2deg($miles);
$miles = $miles * 60 * 1.1515;
$feet = $miles * 5280;
$yards = $feet / 3;
$kilometers = $miles * 1.609344;
$meters = $kilometers * 1000;
returncompact('miles','feet','yards','kilometers','meters');
}
$point1 = array('lat'=> 40.770623,'long'=> -73.964367);
$point2 = array('lat'=> 40.758224,'long'=> -73.917404);
$distance = getDistanceBetweenPointsNew($point1['lat'], $point1['long'], $point2['lat'], $point2['long']);
foreach ($distance as $unit => $value) {
echo $unit.': '.number_format($value,4).'
';
}
The example returns the following:
miles: 2.6025
feet: 13,741.4350
yards: 4,580.4783
kilometers: 4.1884
meters: 4,188.3894
2.完善cURL功能
 

function xcurl($url,$ref=null,$post=array(),$ua="Mozilla/5.0 (X11; Linux x86_64; rv:2.2a1pre) Gecko/20110324 Firefox/4.2a1pre",$print=false) {
$ch = curl_init();
curl_setopt($ch, CURLOPT_AUTOREFERER, true);
if(!empty($ref)) {
curl_setopt($ch, CURLOPT_REFERER, $ref);
}
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
if(!empty($ua)) {
curl_setopt($ch, CURLOPT_USERAGENT, $ua);
}
if(count($post) > 0){
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $post);
}
$output = curl_exec($ch);
curl_close($ch);
if($print) {
print($output);
} else {
return $output;
}
}
3.清理用户输入
]*?>.*?@si', // Strip out javascript
'@<[\/\!]*?[^<>]*?>@si', // Strip out HTML tags
'@]*?>.*?@siU', // Strip style tags properly
'@@' // Strip multi-line comments
);
$output = preg_replace($search, '', $input);
return $output;
}
?>
$val) {
$output[$var] = sanitize($val);
}
}
else {
if (get_magic_quotes_gpc()) {
$input = stripslashes($input);
}
$input = cleanInput($input);
$output = mysql_real_escape_string($input);
}
return $output;
}
?>
4.通过IP（城市、国家）检测地理位置
function detect_city($ip) {

$default = ‘Hollywood, CA’;

if (!is_string($ip) || strlen($ip) < 1 || $ip == ’127.0.0.1′ || $ip == ‘localhost’)

$ip = ’8.8.8.8′;

$curlopt_useragent = ‘Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2) Gecko/20100115 Firefox/3.6 (.NET CLR 3.5.30729)’;

$url = ‘http://ipinfodb.com/ip_locator.php?ip=’ . urlencode($ip);

$ch = curl_init();

$curl_opt = array(

CURLOPT_FOLLOWLOCATION => 1,

CURLOPT_HEADER => 0,

CURLOPT_RETURNTRANSFER => 1,

CURLOPT_USERAGENT => $curlopt_useragent,

CURLOPT_URL => $url,

CURLOPT_TIMEOUT => 1,

CURLOPT_REFERER => ‘http://’ . $_SERVER['HTTP_HOST'],

);

curl_setopt_array($ch, $curl_opt);

$content = curl_exec($ch);

if (!is_null($curl_info)) {

$curl_info = curl_getinfo($ch);

}

curl_close($ch);

if ( preg_match(‘{<li>City : ([^<]*)</li>}i’, $content, $regs) ) {

$city = $regs[1];

}

if ( preg_match(‘{<li>State/Province : ([^<]*)</li>}i’, $content, $regs) ) {

$state = $regs[1];

}

if( $city!=” && $state!=” ){

$location = $city . ‘, ‘ . $state;

return $location;

}else{

return $default;

}

}