複製代碼代碼如下:
<?php
// define the path and name of cached file
$cachefile = 'cached-files/'.date('Md-Y').'.php';
// define how long we want to keep the file in seconds . I set mine to 5 hours.
$cachetime = 18000;
// Check if the cached file is still fresh. If it is, serve it up and exit.
if (file_exists($cachefile) && time() - $cachetime < filemtime ($cachefile)) {
include($cachefile);
exit;
}
// if there is either no file OR the file to too old, render the page and capture the HTML.
ob_start();
?>
<html>
output all your html here.
</html>
<?php
// We're done! Save the cached content to a file
$fp = fopen($cachefile, 'w');
fwrite($fp, ob_get_contents());
fclose($ fp);
// finally send browser output
ob_end_flush();
?>
點擊這裡查看詳細情況：http://wesbos.com/simple-php-page-caching-technique/ 2、在PHP中計算距離這是 一個非常有用的距離計算函數，利用緯度和經度計算從A地點到B地點的距離。該函數可以返回英里，公里，海里三種單位類型的距離。
複製代碼代碼如下:
function distance($lat1, $lon1, $lat2, $lon2, $unit) { $theta = $lon1 - $lon2; $dist = sin(deg2rad($lat1)) * sin(deg2rad($lat2)) + cos (deg2rad($lat1)) * cos(deg2rad($lat2)) * cos(deg2rad($theta)); $dist = acos($dist); $dist = rad2deg($dist); $miles = $dist * 60 * 1.1515; $unit = strtoupper($unit); if ($unit == "K") { return ($miles * 1.609344); } else if ($unit == "N") { return ($miles * 0.8684); } else { return $miles; } }
使用方法：
複製代碼代碼如下:
echo distance(32.9697, -96.80322, 29.46786, -98.53506, "k")." kilometers";
點擊這裡查看詳細情況：http://www.phpsnippets.info/calculate-distances-in-php 3、將秒數轉換為時間（年、月、日、小時…）這個有用的函數能將秒數表示的事件轉換為年、月、日、小時等時間格式。
複製代碼代碼如下:
function Sec2Time($time){
if(is_numeric($time)){
$value = array(
"years" => 0, "days" => 0, "hours" => 0,
"minutes" => 0, " seconds" => 0,
);
if($time >= 31556926){
$value["years"] = floor($time/31556926);
$time = ($time%31556926);
}
if($time >= 86400){
$value["days"] = floor($time/86400);
$time = ($time%86400);
}
if($time >= 3600){
$value["hours"] = floor($ time/3600);
$time = ($time%3600);
}
if($time >= 60){
$value["minutes"] = floor($time/60);
$time = ($time%60) ;
}
$value["seconds"] = floor($time);
return (array) $value;
}else{
return (bool) FALSE;
}
}
點擊這裡查看詳細情況：http://ckorp.net/sec2time.php 4、強制下載文件一些諸如mp3類型的文件，通常會在客戶端瀏覽器中直接被播放或使用。如果你希望它們強制被下載，也沒問題。可以使用以下代碼：
複製代碼代碼如下:
function downloadFile($file){
$file_name = $file;
$mime = 'application/force-download';
header('Pragma: public'); // required
header('Expires: 0'); // no cache
header ('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Cache-Control: private',false);
header('Content-Type: '.$mime);
header('Content-Disposition: attachment; filename="'.basename($file_name).'"');
header('Content-Transfer-Encoding: binary');
header('Connection: close');
readfile($ file_name); // push it out
exit();
}
點擊這裡查看詳細情況：Credit: Alessio Delmonti 5、使用Google API獲取當前天氣信息想知道今天的天氣？這段代碼會告訴你，只需3行代碼。你只需要把其中的ADDRESS換成你期望的城市。
複製代碼代碼如下:
$xml = simplexml_load_file('http://www.google.com/ig/api?weather=ADDRESS');
$information = $xml->xpath("/xml_api_reply/weather/current_conditions/condition");
echo $information [0]->attributes();
點擊這裡查看詳細情況：http://ortanotes.tumblr.com/post/200469319/current-weather-in-3-lines-of-php 6、獲得某個地址的經緯度隨著Google Maps API的普及，開發人員常常需要獲得某一特定地點的經度和緯度。這個非常有用的函數以某一地址作為參數，返回一個數組，包含經度和緯度數據。
複製代碼代碼如下:
function getLatLong($address){
if (!is_string($address))die("All Addresses must be passed as a string");
$_url = sprintf('http://maps.google.com/maps?output= js&q=%s',rawurlencode($address));
$_result = false;
if($_result = file_get_contents($_url)) {
if(strpos($_result,'errortips') > 1 || strpos($_result, 'Did you mean:') !== false) return false;
preg_match('!center:\s*{lat:\s*(-?\d+\.\d+),lng:\s*(-?\ d+\.\d+)}!U', $_result, $_match);
$_coords['lat'] = $_match[1];
$_coords['long'] = $_match[2];
}
return $_coords ;
}
點擊這裡查看詳細情況：http://snipplr.com/view.php?codeview&id=47806 7、使用PHP和Google獲取域名的favicon圖標有些網站或Web應用程序需要使用來自其他網站的favicon圖標。利用Google和PHP很容易就能搞定，不過前提是Google不會連接被重置哦！
複製代碼代碼如下:
function get_favicon($url){
$url = str_replace("http://",'',$url);
return "http://www.google.com/s2/favicons?domain=".$url;
}
