10个超实用的PHP代码片段

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在正确的时间拥有正确的代码片段,绝对是是Web开发人员的救星。今天,为大家已经收集了10个很棒的PHP代码片段,希望对您的开发有所帮助。

Super simple page caching

当你的项目没有基于CMS框架搭建时,利用下面这段代码就能够在你的页面上实现一个简单的缓存系统。非常适合于小型网站。

<?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 output
    ob_end_flush();
?>

Calculate distances in PHP

这里是一个非常方便的功能,使用经度和纬度来计算从A点到B点的距离。该函数可以返回英里,公里,海里的距离。

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;
      }
}

Usage:

echo distance(32.9697, -96.80322, 29.46786, -98.53506, "k")." kilometers";

Convert seconds to time (years, months, days, hours…)

这个方法用于将秒数转换成年,月,周,日等。

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;
  }
}

Force file download

有一些文件,比较mp3,通常会直接在客户端浏览器中播放。假如你希望强制下载这些文件,没有问题,下面这些代码将能够帮助你实现这个功能。

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();
}

Get current weather using Google API

你是否想知道今天的天气?利用下面这段代码,只有3行代码能够实现。将第一段代码中的ADDRESS替换成想知道的地方。

$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();

Basic PHP whois

利用下面这段代码可以取得一个域名的注册基本信息包括:所有者、创建时间,注册情况等信息。但需要在你的服务器上安装whois unix command,这段代码才能起作用。

$domains = array('home.pl', 'w3c.org');

function creation_date($domain) {
    $lines = explode("\n", `whois $domain`);
    foreach($lines as $line) {
        if(strpos(strtolower($line), 'created') !== false) {
            return $line;
        }
    }

    return false;
}

foreach($domains as $d) {
    echo creation_date($d) . "\n";
}

Get latitude and longitude from an adress

利用下面这段代码可以从Google Maps API取得一个地方的经度和纬度。

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;
}

Get domain favicon using PHP and Google

最近,有许多网站或Web应用使用Google提供的服务来获取网站的favicons图标。下面这段代码,可以帮助您实现这个功能。

function get_favicon($url){
  $url = str_replace("http://",'',$url);
  return "http://www.google.com/s2/favicons?domain=".$url;
}

Calculate Paypal fees

Ah, Paypal fees. Every person who ever used the popular online payment service had to pay their fees. So what about a PHP function to easily calculate the fee for a specific amount?

function paypalFees($sub_total, $round_fee) {

	// Set Fee Rate Variables
	$fee_percent = '3.4'; // Paypal's percentage rate per transaction (3.4% in UK)
	$fee_cash    = '0.20'; // Paypal's set cash amount per transaction (£0.20 in UK)

	// Calculate Fees
	$paypal_fee = ((($sub_total / 100) * $fee_percent) + $fee_cash);

	if ($round_fee == true) {
		$paypal_fee = ceil($paypal_fee);
	}

	// Calculate Grand Total
	$grand_total = ($sub_total + $paypal_fee);

	// Tidy Up Numbers
	$sub_total   = number_format($sub_total, 2, '.', ',');
	$paypal_fee  = number_format($paypal_fee, 2, '.', ',');
	$grand_total = number_format($grand_total, 2, '.', ',');

	// Return Array
	return array('grand_total'=>$grand_total, 'paypal_fee'=>$paypal_fee, 'sub_total'=>$sub_total);
}

原文:http://css.dzone.com/news/10-super-useful-php-snippets

请尽量让自己的答案能够对别人有帮助

10个答案

默认排序 按投票排序
0

这个很赞啊

0

真不错

0

+++

0

果号

0
赞啊,不错
0
赞啊,不错
0

0
谢谢!第一个实现简单的缓存代码确实不错。
0