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46个非常有用的PHP代码片段（二）

时间：2021-07-01 10:21:17 帮助过：3人阅读

16. 解压文件[代码]php代码：

  1. function unzip($location,$newLocation)
  2. {
  3.         if(exec("unzip $location",$arr)){
  4.             mkdir($newLocation);
  5.             for($i = 1;$i< count($arr);$i++){
  6.                 $file = trim(preg_replace("~inflating: ~","",$arr[$i]));
  7.                 copy($location.'/'.$file,$newLocation.'/'.$file);
  8.                 unlink($location.'/'.$file);
  9.             }
  10.             return TRUE;
  11.         }else{
  12.             return FALSE;
  13.         }
  14. }

语法：

<?php

unzip('test.zip','unziped/test'); //File would be unzipped in unziped/test folder

?>

17. 缩放图片

[代码]php代码：

  1. function resize_image($filename, $tmpname, $xmax, $ymax)  
  2. {  
  3.     $ext = explode(".", $filename);  
  4.     $ext = $ext[count($ext)-1];  
  5.    
  6.     if($ext == "jpg" || $ext == "jpeg")  
  7.         $im = imagecreatefromjpeg($tmpname);  
  8.     elseif($ext == "png")  
  9.         $im = imagecreatefrompng($tmpname);  
  10.     elseif($ext == "gif")  
  11.         $im = imagecreatefromgif($tmpname);  
  12.        
  13.     $x = imagesx($im);  
  14.     $y = imagesy($im);  
  15.        
  16.     if($x <= $xmax && $y <= $ymax)  
  17.         return $im;  
  18.    
  19.     if($x >= $y) {  
  20.         $newx = $xmax;  
  21.         $newy = $newx * $y / $x;  
  22.     }  
  23.     else {  
  24.         $newy = $ymax;  
  25.         $newx = $x / $y * $newy;  
  26.     }  
  27.        
  28.     $im2 = imagecreatetruecolor($newx, $newy);  
  29.     imagecopyresized($im2, $im, 0, 0, 0, 0, floor($newx), floor($newy), $x, $y);  
  30.     return $im2;   
  31. }

18. 使用 mail() 发送邮件

之前我们提供了如何使用 Mandrill 发送邮件的 PHP 代码片段，但是如果你不想使用第三方服务，那么可以使用下面的 PHP 代码片段。

[代码]php代码：

  1. function send_mail($to,$subject,$body)
  2. {
  3. $headers = "From: KOONK\r\n";
  4. $headers .= "Reply-To: blog@koonk.com\r\n";
  5. $headers .= "Return-Path: blog@koonk.com\r\n";
  6. $headers .= "X-Mailer: PHP5\n";
  7. $headers .= 'MIME-Version: 1.0' . "\n";
  8. $headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";
  9. mail($to,$subject,$body,$headers);
  10. }

语法：

<?php

$to = "admin@koonk.com";

$subject = "This is a test mail";

$body = "Hello World!";

send_mail($to,$subject,$body);

?>

19. 把秒转换成天数，小时数和分钟

[代码]php代码：

  1. function secsToStr($secs) {
  2.     if($secs>=86400){$days=floor($secs/86400);$secs=$secs%86400;$r=$days.' day';if($days<>1){$r.='s';}if($secs>0){$r.=', ';}}
  3.     if($secs>=3600){$hours=floor($secs/3600);$secs=$secs%3600;$r.=$hours.' hour';if($hours<>1){$r.='s';}if($secs>0){$r.=', ';}}
  4.     if($secs>=60){$minutes=floor($secs/60);$secs=$secs%60;$r.=$minutes.' minute';if($minutes<>1){$r.='s';}if($secs>0){$r.=', ';}}
  5.     $r.=$secs.' second';if($secs<>1){$r.='s';}
  6.     return $r;
  7. }

语法：

<?php

$seconds = "56789";

$output = secsToStr($seconds);

echo $output;

?>

20. 数据库连接

  1. <?php
  2. $DBNAME = 'koonk';
  3. $HOST = 'localhost';
  4. $DBUSER = 'root';
  5. $DBPASS = 'koonk';
  6. $CONNECT = mysql_connect($HOST,$DBUSER,$DBPASS);
  7. if(!$CONNECT)
  8. {
  9.     echo 'MySQL Error: '.mysql_error();
  10. }
  11. $SELECT = mysql_select_db($DBNAME);
  12. if(!$SELECT)
  13. {
  14.     echo 'MySQL Error: '.mysql_error();
  15. }
  16. ?>

21. 目录清单

使用下面的 PHP 代码片段可以在一个目录中列出所有文件和文件夹

[代码]php代码：

  1. function list_files($dir)
  2. {
  3.     if(is_dir($dir))
  4.     {
  5.         if($handle = opendir($dir))
  6.         {
  7.             while(($file = readdir($handle)) !== false)
  8.             {
  9.                 if($file != "." && $file != ".." && $file != "Thumbs.db"/*pesky windows, images..*/)
  10.                 {
  11.                     echo '<a target="_blank" href="'.$dir.$file.'">'.$file.'</a><br>'."\n";
  12.                 }
  13.             }
  14.             closedir($handle);
  15.         }
  16.     }
  17. }

语法：

<?php

list_files("images/"); //This will list all files of images folder

?>

22. 检测用户语言

使用下面的 PHP 代码片段可以检测用户浏览器所使用的语言

[代码]php代码：

  1. function get_client_language($availableLanguages, $default='en'){
  2.     if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
  3.         $langs=explode(',',$_SERVER['HTTP_ACCEPT_LANGUAGE']);
  4.         foreach ($langs as $value){
  5.             $choice=substr($value,0,2);
  6.             if(in_array($choice, $availableLanguages)){
  7.                 return $choice;
  8.             }
  9.         }
  10.     } 
  11.     return $default;
  12. }

23. 查看 CSV 文件

[代码]php代码：

  1. function readCSV($csvFile){
  2.     $file_handle = fopen($csvFile, 'r');
  3.     while (!feof($file_handle) ) {
  4.         $line_of_text[] = fgetcsv($file_handle, 1024);
  5.     }
  6.     fclose($file_handle);
  7.     return $line_of_text;
  8. }

语法：

<?php

$csvFile = "test.csv";

$csv = readCSV($csvFile);

$a = csv[0][0]; // This will get value of Column 1 & Row 1

?>

24. 从 PHP 数据创建 CSV 文件

[代码]php代码：

  1. function generateCsv($data, $delimiter = ',', $enclosure = '"') {
  2.    $handle = fopen('php://temp', 'r+');
  3.    foreach ($data as $line) {
  4.            fputcsv($handle, $line, $delimiter, $enclosure);
  5.    }
  6.    rewind($handle);
  7.    while (!feof($handle)) {
  8.            $contents .= fread($handle, 8192);
  9.    }
  10.    fclose($handle);
  11.    return $contents;
  12. }

语法：

<?php

$data[0] = "apple";

$data[1] = "oranges";

generateCsv($data, $delimiter = ',', $enclosure = '"');

?>

25. 解析 XML 数据

[代码]php代码：

  1. $xml_string="<!--?xml version='1.0'?-->
  2. <moleculedb>
  3.     <molecule name="Benzine">
  4.         <symbol>ben</symbol>
  5.         <code>A</code>
  6.     </molecule>
  7.     <molecule name="Water">
  8.         <symbol>h2o</symbol>
  9.         <code>K</code>
  10.     </molecule>
  11. </moleculedb>";
  12.   
  13. //load the xml string using <a href="http://www.php-z.com/" target="_blank" class="relatedlink">Simple</a>xml function
  14. $xml = simplexml_load_string($xml_string);
  15.   
  16. //loop through the each node of molecule
  17. foreach ($xml->molecule as $record)
  18. {
  19.    //attribute are accessted by
  20.    echo $record['name'], '  ';
  21.    //node are accessted by -> operator
  22.    echo $record->symbol, '  ';
  23.    echo $record->code, '<br>';
  24. }

26. 解析 JSON 数据

[代码]php代码：

  1. $json_string='{"id":1,"name":"rolf","country":"russia","office":["google","oracle"]} ';
  2. $obj=json_decode($json_string);
  3. //print the parsed data
  4. echo $obj->name; //displays rolf
  5. echo $obj->office[0]; //displays google

27. 获取当前页面 URL

这个 PHP 片段可以帮助你让用户登录后直接跳转到之前浏览的页面

[代码]php代码：

  1. function current_url()
  2. {
  3. $url = "http://" . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
  4. $validURL = str_replace("&", "&", $url);
  5. return validURL;
  6. }

语法：

<?php

echo "Currently you are on: ".current_url();

?>

28. 从任意的 Twitter 账号获取最新的 Tweet

[代码]php代码：

  1. function my_twitter($username) 
  2. {
  3.      $no_of_tweets = 1;
  4.      $feed = "http://search.twitter.com/search.atom?q=from:" . $username . "&rpp=" . $no_of_tweets;
  5.      $xml = simplexml_load_file($feed);
  6.     foreach($xml->children() as $child) {
  7.         foreach ($child as $value) {
  8.             if($value->getName() == "link") $link = $value['href'];
  9.             if($value->getName() == "content") {
  10.                 $content = $value . "";
  11.         echo '<p class="twit">'.$content.' <a class="twt" href="'.$link.'" title="">  </a></p>';
  12.             }    
  13.         }
  14.     }    
  15. }

语法：

<?php

$handle = "koonktech";

my_twitter($handle);

?>

29. 转发数量

使用这个 PHP 片段可以检测你的页面 URL 有多少转发数量

[代码]php代码：

  1. function tweetCount($url) {
  2.     $content = file_get_contents("http://api.tweetmeme.com/url_info?url=".$url);
  3.     $element = new SimpleXmlElement($content);
  4.     $retweets = $element->story->url_count;
  5.     if($retweets){
  6.         return $retweets;
  7.     } else {
  8.         return 0;
  9.     }
  10. }

语法：

<?php

$url = "http://blog.koonk.com";

$count = tweetCount($url);

return $count;

?>

30. 计算两个日期的差

[代码]php代码：

  1. <!--?php
  2. $date1 = date( 'Y-m-d' );
  3. $date2 = "2015-12-04";
  4. $diff = abs(strtotime($date2) - strtotime($date1));
  5. $years = floor($diff / (365*60*60*24));
  6. $months = floor(($diff - $years * 365*60*60*24) / (30*60*60*24));
  7. $days = floor(($diff - $years * 365*60*60*24 - $months*30*60*60*24)/ (60*60*24));
  8. printf("%d years, %d months, %d days\n", $years, $months, $days);
  9. -------------------------------------------------------- OR
  10. $date1 = new DateTime("2007-03-24");
  11. $date2 = new DateTime("2009-06-26");
  12. $interval = $date1--->diff($date2);
  13. echo "difference " . $interval->y . " years, " . $interval->m." months, ".$interval->d." days "; 
  14. // shows the total amount of days (not divided into years, months and days like above)
  15. echo "difference " . $interval->days . " days ";
  16. -------------------------------------------------------- OR
  17.      
  18.      
  19. /**
  20.  * Calculate differences between two dates with precise semantics. <a href="http://www.php-z.com/" target="_blank" class="relatedlink">Base</a>d on PHPs DateTime::diff()
  21.  * implementation by Derick Rethans. Ported to PHP by Emil H, 2011-05-02. No rights reserved.
  22.  * 
  23.  * See here for original code:
  24.  * http://svn.php.com/viewvc/php/php-src/trunk/ext/date/lib/tm2unixtime.c?revision=302890&view=markup
  25.  * http://svn.php.com/viewvc/php/php-src/trunk/ext/date/lib/interval.c?revision=298973&view=markup
  26.  */
  27. function _date_range_limit($start, $end, $adj, $a, $b, $result)
  28. {
  29.     if ($result[$a] < $start) {
  30.         $result[$b] -= intval(($start - $result[$a] - 1) / $adj) + 1;
  31.         $result[$a] += $adj * intval(($start - $result[$a] - 1) / $adj + 1);
  32.     }
  33.     if ($result[$a] >= $end) {
  34.         $result[$b] += intval($result[$a] / $adj);
  35.         $result[$a] -= $adj * intval($result[$a] / $adj);
  36.     }
  37.     return $result;
  38. }
  39. function _date_range_limit_days($base, $result)
  40. {
  41.     $days_in_month_leap = array(31, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
  42.     $days_in_month = array(31, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
  43.     _date_range_limit(1, 13, 12, "m", "y", &$base);
  44.     $year = $base["y"];
  45.     $month = $base["m"];
  46.     if (!$result["invert"]) {
  47.         while ($result["d"] < 0) {
  48.             $month--;
  49.             if ($month < 1) {
  50.                 $month += 12;
  51.                 $year--;
  52.             }
  53.             $leapyear = $year % 400 == 0 || ($year % 100 != 0 && $year % 4 == 0);
  54.             $days = $leapyear ? $days_in_month_leap[$month] : $days_in_month[$month];
  55.             $result["d"] += $days;
  56.             $result["m"]--;
  57.         }
  58.     } else {
  59.         while ($result["d"] < 0) {
  60.             $leapyear = $year % 400 == 0 || ($year % 100 != 0 && $year % 4 == 0);
  61.             $days = $leapyear ? $days_in_month_leap[$month] : $days_in_month[$month];
  62.             $result["d"] += $days;
  63.             $result["m"]--;
  64.             $month++;
  65.             if ($month > 12) {
  66.                 $month -= 12;
  67.                 $year++;
  68.             }
  69.         }
  70.     }
  71.     return $result;
  72. }
  73. function _date_normalize($base, $result)
  74. {
  75.     $result = _date_range_limit(0, 60, 60, "s", "i", $result);
  76.     $result = _date_range_limit(0, 60, 60, "i", "h", $result);
  77.     $result = _date_range_limit(0, 24, 24, "h", "d", $result);
  78.     $result = _date_range_limit(0, 12, 12, "m", "y", $result);
  79.     $result = _date_range_limit_days(&$base, &$result);
  80.     $result = _date_range_limit(0, 12, 12, "m", "y", $result);
  81.     return $result;
  82. }
  83. /**
  84.  * Accepts two unix timestamps.
  85.  */
  86. function _date_diff($one, $two)
  87. {
  88.     $invert = false;
  89.     if ($one > $two) {
  90.         list($one, $two) = array($two, $one);
  91.         $invert = true;
  92.     }
  93.     $key = array("y", "m", "d", "h", "i", "s");
  94.     $a = array_combine($key, array_map("intval", explode(" ", date("Y m d H i s", $one))));
  95.     $b = array_combine($key, array_map("intval", explode(" ", date("Y m d H i s", $two))));
  96.     $result = array();
  97.     $result["y"] = $b["y"] - $a["y"];
  98.     $result["m"] = $b["m"] - $a["m"];
  99.     $result["d"] = $b["d"] - $a["d"];
  100.     $result["h"] = $b["h"] - $a["h"];
  101.     $result["i"] = $b["i"] - $a["i"];
  102.     $result["s"] = $b["s"] - $a["s"];
  103.     $result["invert"] = $invert ? 1 : 0;
  104.     $result["days"] = intval(abs(($one - $two)/86400));
  105.     if ($invert) {
  106.         _date_normalize(&$a, &$result);
  107.     } else {
  108.         _date_normalize(&$b, &$result);
  109.     }
  110.     return $result;
  111. }
  112. $date = "2014-12-04 19:37:22";
  113. echo '<pre>';
  114. print_r( _date_diff( strtotime($date), time() ) );
  115. echo '</pre>'; 
  116. ?>

以上就是46 个非常有用的 PHP 代码片段（二）的内容，更多相关内容请关注PHP中文网（www.gxlcms.com）！

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