關鍵的時候能拿得出關鍵代碼才是好的程序員。這篇文章里芒果小站收集了一些諸如此類的關鍵代碼,有用于編程。
如果你的工程項目不是基于 CMS 系統或框架,打造一個簡單的緩存系統將會非常實在。下面的代碼很簡單,但是對小網站而言能切切實實解決問題。
<?php// define the path and name of cached file$cachefile = 'cached-files/'.date('M-d-Y').'.php';// define how long we want to keep the file in seconds. I set mine to 5 hours.$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($fp);// finally send browser outputob_end_flush();?>
點擊這里查看詳細情況:http://wesbos.com/simple-php-page-caching-technique/
這是一個非常有用的距離計算函數,利用緯度和經度計算從 A 地點到 B 地點的距離。該函數可以返回英里,公里,海里三種單位類型的距離。
function distance($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 $miles;}}
使用方法:
echo distance(32.9697, -96.80322, 29.46786, -98.53506, "k")." kilometers";
點擊這里查看詳細情況:http://www.phpsnippets.info/calculate-distances-in-php
這個有用的函數能將秒數表示的事件轉換為年、月、日、小時等時間格式。
function Sec2Time($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) $value;}else{return (bool) FALSE;}}
點擊這里查看詳細情況:http://ckorp.net/sec2time.php
一些諸如 mp3 類型的文件,通常會在客戶端瀏覽器中直接被播放或使用。如果你希望它們強制被下載,也沒問題。可以使用以下代碼:
function downloadFile($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();}
點擊這里查看詳細情況:Credit: Alessio Delmonti
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。
$xml = simplexml_load_file('http://www.google.com/ig/api?weather=ADDRESS');$information = $xml->xpath("/xml_api_reply/weather/current_conditions/condition");echo $information[0]->attributes();
點擊這里查看詳細情況:http://ortanotes.tumblr.com/post/200469319/current-weather-in-3-lines-of-php
隨著 Google Maps API 的普及,開發人員常常需要獲得某一特定地點的經度和緯度。這個非常有用的函數以某一地址作為參數,返回一個數組,包含經度和緯度數據。
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點擊這里查看詳細情況:http://snipplr.com/view.php?codeview&id=47806
有些網站或 Web 應用程序需要使用來自其他網站的 favicon 圖標。利用 Google 和 PHP 很容易就能搞定,不過前提是 Google 不會連接被重置哦!
function get_favicon($url){$url = str_replace("http://",'',$url);return "http://www.google.com/s2/favicons?domain=".$url;}
點擊這里查看詳細情況:http://snipplr.com/view.php?codeview&id=45928
參考資料:10 super useful PHP snippets