46 个非常有用的 PHP 代码片段(4)


17. 缩放图片

function resize_image($filename, $tmpname, $xmax, $ymax) { $ext = explode(".", $filename); $ext = $ext[count($ext)-1]; if($ext == "jpg" || $ext == "jpeg") $im = imagecreatefromjpeg($tmpname); elseif($ext == "png") $im = imagecreatefrompng($tmpname); elseif($ext == "gif") $im = imagecreatefromgif($tmpname); $x = imagesx($im); $y = imagesy($im); if($x <= $xmax && $y <= $ymax) return $im; if($x >= $y) { $newx = $xmax; $newy = $newx * $y / $x; } else { $newy = $ymax; $newx = $x / $y * $newy; } $im2 = imagecreatetruecolor($newx, $newy); imagecopyresized($im2, $im, 0, 0, 0, 0, floor($newx), floor($newy), $x, $y); return $im2; }


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。

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

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

语法:

<?php $seconds = "56789"; $output = secsToStr($seconds); echo $output; ?>

20. 数据库连接
连接 MySQL 数据库

<?php $DBNAME = 'koonk'; $HOST = 'localhost'; $DBUSER = 'root'; $DBPASS = 'koonk'; $CONNECT = mysql_connect($HOST,$DBUSER,$DBPASS); if(!$CONNECT) { echo 'MySQL Error: '.mysql_error(); } $SELECT = mysql_select_db($DBNAME); if(!$SELECT) { echo 'MySQL Error: '.mysql_error(); } ?>

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

function list_files($dir) { if(is_dir($dir)) { if($handle = opendir($dir)) { while(($file = readdir($handle)) !== false) { if($file != "." && $file != ".." && $file != "Thumbs.db"/*pesky windows, images..*/) { echo '<a target="_blank" href="'https://www.jb51.net/article/.$dir.$file.'">'.$file.'</a>'."\n"; } } closedir($handle); } } }


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

function get_client_language($availableLanguages, $default='en'){ if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) { $langs=explode(',',$_SERVER['HTTP_ACCEPT_LANGUAGE']); foreach ($langs as $value){ $choice=substr($value,0,2); if(in_array($choice, $availableLanguages)){ return $choice; } } } return $default; }


23. 查看 CSV 文件

function readCSV($csvFile){ $file_handle = fopen($csvFile, 'r'); while (!feof($file_handle) ) { $line_of_text[] = fgetcsv($file_handle, 1024); } fclose($file_handle); return $line_of_text; } 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

function generateCsv($data, $delimiter = ',', $enclosure = '"') { $handle = fopen('php://temp', 'r+'); foreach ($data as $line) { fputcsv($handle, $line, $delimiter, $enclosure); } rewind($handle); while (!feof($handle)) { $contents .= fread($handle, 8192); } fclose($handle); return $contents; } 语法: <?php $data[0] = "apple"; $data[1] = "oranges"; generateCsv($data, $delimiter = ',', $enclosure = '"'); ?>

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