10个超级有用的PHP代码片段果断收藏

本文小编将为你奉上10个超级有用的PHP代码片段。

1.查找Longitudes与Latitudes之间的距离

function getDistanceBetweenPointsNew($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;  return compact('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('{   City : ([^<]*) }i', $content, $regs) ) { $city = $regs[1]; } if ( preg_match('{  State/Province : ([^<]*)  }i', $content, $regs) ) { $state = $regs[1]; } if( $city!='' && $state!='' ){ $location = $city . ', ' . $state; return $location; }else{ return $default; } }