Maison >développement back-end >tutoriel php >46 个非常有用的 PHP 代码片段(二)
16. 解压文件[代码]php代码:
function unzip($location,$newLocation) { if(exec("unzip $location",$arr)){ mkdir($newLocation); for($i = 1;$i< count($arr);$i++){ $file = trim(preg_replace("~inflating: ~","",$arr[$i])); copy($location.'/'.$file,$newLocation.'/'.$file); unlink($location.'/'.$file); } return TRUE; }else{ return FALSE; } }
语法:
9e9f8817f91a2c1a4358e386f3add7b9
17. 缩放图片
[代码]php代码:
function resize_image($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 $im2; }
18. 使用 mail() 发送邮件
之前我们提供了如何使用 Mandrill 发送邮件的 PHP 代码片段,但是如果你不想使用第三方服务,那么可以使用下面的 PHP 代码片段。
[代码]php代码:
function send_mail($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,$headers); }
语法:
eae4bd087f5ad93df459ff2359b0edfd
19. 把秒转换成天数,小时数和分钟
[代码]php代码:
function secsToStr($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:
4227a6e5c8579fa1152dfa5c031267eb
20. 数据库连接
<?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(!$SELECT) { echo 'MySQL Error: '.mysql_error(); } ?>
21. 目录清单
使用下面的 PHP 代码片段可以在一个目录中列出所有文件和文件夹
[代码]php代码:
function list_files($dir) { if(is_dir($dir)) { if($handle = opendir($dir)) { while(($file = readdir($handle)) !== false) { if($file != "." && $file != ".." && $file != "Thumbs.db"/*pesky windows, images..*/) { echo '<a target="_blank" href="'.$dir.$file.'">'.$file.'</a><br>'."\n"; } } closedir($handle); } } }
语法:
a420b8039c47fa564c2fe32fb869e7cf
22. 检测用户语言
使用下面的 PHP 代码片段可以检测用户浏览器所使用的语言
[代码]php代码:
function get_client_language($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 $default; }
23. 查看 CSV 文件
[代码]php代码:
function readCSV($csvFile){ $file_handle = fopen($csvFile, 'r'); while (!feof($file_handle) ) { $line_of_text[] = fgetcsv($file_handle, 1024); } fclose($file_handle); return $line_of_text; }
语法:
73d0c509a9266938a19aba929b770cc1
24. 从 PHP 数据创建 CSV 文件
[代码]php代码:
function generateCsv($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:
17c966e502b7590bf802cca5d29fa4d3
25. 解析 XML 数据
[代码]php代码:
$xml_string="<!--?xml version='1.0'?--> <moleculedb> <molecule name="Benzine"> <symbol>ben</symbol> <code>A</code> </molecule> <molecule name="Water"> <symbol>h2o</symbol> <code>K</code> </molecule> </moleculedb>"; //load the xml string using <a href="http://www.php-z.com/" target="_blank" class="relatedlink">Simple</a>xml function $xml = simplexml_load_string($xml_string); //loop through the each node of molecule foreach ($xml->molecule as $record) { //attribute are accessted by echo $record['name'], ' '; //node are accessted by -> operator echo $record->symbol, ' '; echo $record->code, '<br>'; }
26. 解析 JSON 数据
[代码]php代码:
$json_string='{"id":1,"name":"rolf","country":"russia","office":["google","oracle"]} '; $obj=json_decode($json_string); //print the parsed data echo $obj->name; //displays rolf 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:
function current_url() { $url = "http://" . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI']; $validURL = str_replace("&", "&", $url); return validURL; }
语法:
55bff9c5d4f944512e4d2f8a2ad0e9e3
28. 从任意的 Twitter 账号获取最新的 Tweet
[代码]php代码:
function my_twitter($username) { $no_of_tweets = 1; $feed = "http://search.twitter.com/search.atom?q=from:" . $username . "&rpp=" . $no_of_tweets; $xml = simplexml_load_file($feed); foreach($xml->children() as $child) { foreach ($child as $value) { if($value->getName() == "link") $link = $value['href']; if($value->getName() == "content") { $content = $value . ""; echo '<p class="twit">'.$content.' <a class="twt" href="'.$link.'" title=""> </a></p>'; } } } }
语法:
fb556a5f87b8650a5cdf7d920612a81c
29. 转发数量
使用这个 PHP 片段可以检测你的页面 URL 有多少转发数量
[代码]php代码:
function tweetCount($url) { $content = file_get_contents("http://api.tweetmeme.com/url_info?url=".$url); $element = new SimpleXmlElement($content); $retweets = $element->story->url_count; if($retweets){ return $retweets; } else { return 0; } }
语法:
d697ebd129cfc844e5ee9848e6ac19af
30. 计算两个日期的差
[代码]php代码:
<!--?php $date1 = date( 'Y-m-d' ); $date2 = "2015-12-04"; $diff = abs(strtotime($date2) - strtotime($date1)); $years = floor($diff / (365*60*60*24)); $months = floor(($diff - $years * 365*60*60*24) / (30*60*60*24)); $days = floor(($diff - $years * 365*60*60*24 - $months*30*60*60*24)/ (60*60*24)); printf("%d years, %d months, %d days\n", $years, $months, $days); -------------------------------------------------------- OR $date1 = new DateTime("2007-03-24"); $date2 = new DateTime("2009-06-26"); $interval = $date1--->diff($date2); echo "difference " . $interval->y . " years, " . $interval->m." months, ".$interval->d." days "; // shows the total amount of days (not divided into years, months and days like above) echo "difference " . $interval->days . " days "; -------------------------------------------------------- OR /** * Calculate differences between two dates with precise semantics. <a href="http://www.php-z.com/" target="_blank" class="relatedlink">Base</a>d on PHPs DateTime::diff() * implementation by Derick Rethans. Ported to PHP by Emil H, 2011-05-02. No rights reserved. * * See here for original code: * http://svn.php.net/viewvc/php/php-src/trunk/ext/date/lib/tm2unixtime.c?revision=302890&view=markup * http://svn.php.net/viewvc/php/php-src/trunk/ext/date/lib/interval.c?revision=298973&view=markup */ function _date_range_limit($start, $end, $adj, $a, $b, $result) { if ($result[$a] < $start) { $result[$b] -= intval(($start - $result[$a] - 1) / $adj) + 1; $result[$a] += $adj * intval(($start - $result[$a] - 1) / $adj + 1); } if ($result[$a] >= $end) { $result[$b] += intval($result[$a] / $adj); $result[$a] -= $adj * intval($result[$a] / $adj); } return $result; } function _date_range_limit_days($base, $result) { $days_in_month_leap = array(31, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31); $days_in_month = array(31, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31); _date_range_limit(1, 13, 12, "m", "y", &$base); $year = $base["y"]; $month = $base["m"]; if (!$result["invert"]) { while ($result["d"] < 0) { $month--; if ($month < 1) { $month += 12; $year--; } $leapyear = $year % 400 == 0 || ($year % 100 != 0 && $year % 4 == 0); $days = $leapyear ? $days_in_month_leap[$month] : $days_in_month[$month]; $result["d"] += $days; $result["m"]--; } } else { while ($result["d"] < 0) { $leapyear = $year % 400 == 0 || ($year % 100 != 0 && $year % 4 == 0); $days = $leapyear ? $days_in_month_leap[$month] : $days_in_month[$month]; $result["d"] += $days; $result["m"]--; $month++; if ($month > 12) { $month -= 12; $year++; } } } return $result; } function _date_normalize($base, $result) { $result = _date_range_limit(0, 60, 60, "s", "i", $result); $result = _date_range_limit(0, 60, 60, "i", "h", $result); $result = _date_range_limit(0, 24, 24, "h", "d", $result); $result = _date_range_limit(0, 12, 12, "m", "y", $result); $result = _date_range_limit_days(&$base, &$result); $result = _date_range_limit(0, 12, 12, "m", "y", $result); return $result; } /** * Accepts two unix timestamps. */ function _date_diff($one, $two) { $invert = false; if ($one > $two) { list($one, $two) = array($two, $one); $invert = true; } $key = array("y", "m", "d", "h", "i", "s"); $a = array_combine($key, array_map("intval", explode(" ", date("Y m d H i s", $one)))); $b = array_combine($key, array_map("intval", explode(" ", date("Y m d H i s", $two)))); $result = array(); $result["y"] = $b["y"] - $a["y"]; $result["m"] = $b["m"] - $a["m"]; $result["d"] = $b["d"] - $a["d"]; $result["h"] = $b["h"] - $a["h"]; $result["i"] = $b["i"] - $a["i"]; $result["s"] = $b["s"] - $a["s"]; $result["invert"] = $invert ? 1 : 0; $result["days"] = intval(abs(($one - $two)/86400)); if ($invert) { _date_normalize(&$a, &$result); } else { _date_normalize(&$b, &$result); } return $result; } $date = "2014-12-04 19:37:22"; echo '<pre class="brush:php;toolbar:false">'; print_r( _date_diff( strtotime($date), time() ) ); echo ''; ?>
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.php.cn)!