必须收藏的php实用代码片段
发布:smiling 来源: PHP粉丝网 添加日期:2021-07-07 20:04:23 浏览: 评论:0
在编写代码的时候有个神奇的工具总是好的!下面这里收集了 40+ PHP 代码片段,可以帮助你开发PHP 项目。 之前已经为大家分享了《必须收藏的23个php实用代码片段》。
这些PHP 片段对于PHP 初学者也非常有帮助,非常容易学习,让我们开始学习吧~
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 = '"');
- ?>
25. 解析 XML 数据
- $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 simplexml 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, '';
- }
26. 解析 JSON 数据
- $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
- function current_url()
- {
- $url = "http://" . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
- $validURL = str_replace("&", "&", $url);
- return validURL;
- }
语法:
- <?php
- echo "Currently you are on: ".current_url();
- ?>
28. 从任意的 Twitter 账号获取最新的 Tweet
- function my_twitter($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:
- <?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
- 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:
- <?php
- $url = "http://blog.koonk.com";
- $count = tweetCount($url);
- return $count;
- ?>
30. 计算两个日期的差
- <?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 " . $interval->days . " days ";
- -------------------------------------------------------- OR
- /**
- * Calculate differences between two dates with precise semantics. Based on PHPs DateTime::diff()
- * implementation by Derick Rethans. Ported to PHP by Emil H, 2011-05-02. No rights reserved.
- *
- * See here for original code:
- * http://svn.php.net/viewvc/php/php-src/trunk/ext/date/lib/tm2unixtime.c?revision=302890&view=markup
- * http://svn.php.net/viewvc/php/php-src/trunk/ext/date/lib/interval.c?revision=298973&view=markup
- */
- function _date_range_limit($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;
- }
- $date = "2014-12-04 19:37:22";
- echo '<pre>';
- print_r( _date_diff( strtotime($date), time() ) );
- echo '</pre>';
- ?>
31. 删除文件夹内容
- function Delete($path)
- {
- if (is_dir($path) === true)
- {
- $files = array_diff(scandir($path), array('.', '..'));
- foreach ($files as $file)
- {
- Delete(realpath($path) . '/' . $file);
- }
- return rmdir($path);
- }
- else if (is_file($path) === true)
- {
- return unlink($path);
- }
- return false;
- }
语法:
- <?php
- $path = "images/";
- Delete($path); // This will delete images folder along with its contents.
- ?>
32. 搜索和高亮字符串中的关键字
- function highlighter_text($text, $words)
- {
- $split_words = explode( " " , $words );
- foreach($split_words as $word)
- {
- $color = "#4285F4";
- $text = preg_replace("|($word)|Ui" ,
- "<span style=\"color:".$color.";\"><b>$1</b></span>" , $text );
- }
- return $text;
- }
语法:
- <?php
- $string = "I like chocolates and I like apples";
- $words = "apple";
- echo highlighter_text($string ,$words);
- ?>
33. 写入文件
- <?
- $filename = 'blog.csv';
- $fp = fopen($filename, 'w');
- $output = " Hello ";
- $output .= " World! ";
- $output .= "\r\n";
- fputs($fp, $output);
- fclose($fp);
- ?>
34. 根据 URL 下载图片
- function imagefromURL($image,$rename)
- {
- $ch = curl_init($image);
- curl_setopt($ch, CURLOPT_HEADER, 0);
- curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
- curl_setopt($ch, CURLOPT_BINARYTRANSFER,1);
- $rawdata=curl_exec ($ch);
- curl_close ($ch);
- $fp = fopen("$rename",'w');
- fwrite($fp, $rawdata);
- fclose($fp);
- }
语法:
- <?php
- $url = "http://koonk.com/images/logo.png";
- $rename = "koonk.png";
- imagefromURL($url,$rename);
- ?>
35. 检测 URL 是否有效
- function isvalidURL($url)
- {
- $check = 0;
- if (filter_var($url, FILTER_VALIDATE_URL) !== false) {
- $check = 1;
- }
- return $check;
- }
语法:
- <?php
- $url = "http://www.phpfensi.com";
- $check = checkvalidURL($url);
- echo $check; //if returns 1 then URL is valid.
- ?>
36. 生成二维码
- function qr_code($data, $type = "TXT", $size ='150', $ec='L', $margin='0')
- {
- $types = array("URL" =--> "http://", "TEL" => "TEL:", "TXT"=>"", "EMAIL" => "MAILTO:");
- if(!in_array($type,array("URL", "TEL", "TXT", "EMAIL")))
- {
- $type = "TXT";
- }
- if (!preg_match('/^'.$types[$type].'/', $data))
- {
- $data = str_replace("\\", "", $types[$type]).$data;
- }
- $ch = curl_init();
- $data = urlencode($data);
- curl_setopt($ch, CURLOPT_URL, 'http://chart.apis.google.com/chart');
- curl_setopt($ch, CURLOPT_POST, true);
- curl_setopt($ch, CURLOPT_POSTFIELDS, 'chs='.$size.'x'.$size.'&cht=qr&chld='.$ec.'|'.$margin.'&chl='.$data);
- curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
- curl_setopt($ch, CURLOPT_HEADER, false);
- curl_setopt($ch, CURLOPT_TIMEOUT, 30);
- $response = curl_exec($ch);
- curl_close($ch);
- return $response;
- }
语法:
- <?php
- header("Content-type: image/png");
- echo qr_code("http://koonk.com", "URL");
- ?>
37. 计算两个地图坐标之间的距离
- function getDistanceBetweenPointsNew($latitude1, $longitude1, $latitude2, $longitude2) {
- $theta = $longitude1 - $longitude2;
- $miles = (sin(deg2rad($latitude1)) * sin(deg2rad($latitude2))) + (cos(deg2rad($latitude1)) * cos(deg2rad($latitude2)) * cos(deg2rad($theta)));
- $miles = acos($miles);
- $miles = rad2deg($miles);
- $miles = $miles * 60 * 1.1515;
- $feet = $miles * 5280;
- $yards = $feet / 3;
- $kilometers = $miles * 1.609344;
- $meters = $kilometers * 1000;
- return compact('miles','feet','yards','kilometers','meters');
- }
语法:
- <?php
- $point1 = array('lat' => 40.770623, 'long' => -73.964367);
- $point2 = array('lat' => 40.758224, 'long' => -73.917404);
- $distance = getDistanceBetweenPointsNew($point1['lat'], $point1['long'], $point2['lat'], $point2['long']);
- foreach ($distance as $unit => $value) {
- echo $unit.': '.number_format($value,4).'';
- }
- ?>
38. 获取一个特定话题标签的所有 Tweets
- function getTweets($hash_tag) {
- $url = 'http://search.twitter.com/search.atom?q='.urlencode($hash_tag) ;
- echo "<p>Connecting to <strong>$url</strong> ...</p>";
- $ch = curl_init($url);
- curl_setopt ($ch, CURLOPT_RETURNTRANSFER, TRUE);
- $xml = curl_exec ($ch);
- curl_close ($ch);
- //If you want to see the response from Twitter, uncomment this next part out:
- //echo "<p>Response:</p>";
- //echo "<pre>".htmlspecialchars($xml)."</pre>";
- $affected = 0;
- $twelement = new SimpleXMLElement($xml);
- foreach ($twelement->entry as $entry) {
- $text = trim($entry->title);
- $author = trim($entry->author->name);
- $time = strtotime($entry->published);
- $id = $entry->id;
- echo "<p>Tweet from ".$author.": <strong>".$text."</strong> <em>Posted ".date('n/j/y g:i a',$time)."</em></p>";
- }
- return true ;
- }
39. 添加 th,st,nd 或者 rd 作为数字的后缀
- Friday the 13th
- function ordinal($cdnl){
- $test_c = abs($cdnl) % 10;
- $ext = ((abs($cdnl) %100 < 21 && abs($cdnl) %100 > 4) ? 'th'
- : (($test_c < 4) ? ($test_c < 3) ? ($test_c < 2) ? ($test_c < 1)
- ? 'th' : 'st' : 'nd' : 'rd' : 'th'));
- return $cdnl.$ext;
- }
语法:
- <?php
- $number = 10;
- echo ordinal($number); //output is 10th
- ?>
40. 限制文件下载的速度
- <?php
- // local file that should be send to the client
- $local_file = 'test-file.zip';
- // filename that the user gets as default
- $download_file = 'your-download-name.zip';
- // set the download rate limit (=> 20,5 kb/s)
- $download_rate = 20.5;
- if(file_exists($local_file) && is_file($local_file)) {
- // send headers
- header('Cache-control: private');
- header('Content-Type: application/octet-stream');
- header('Content-Length: '.filesize($local_file));
- header('Content-Disposition: filename='.$download_file);
- // flush content
- flush();
- // open file stream
- $file = fopen($local_file, "r");
- while(!feof($file)) {
- // send the current file part to the browser
- print fread($file, round($download_rate * 1024));
- // flush the content to the browser
- flush();
- // sleep one second
- sleep(1);
- }
- // close file stream
- fclose($file);}
- else {
- die('Error: The file '.$local_file.' does not exist!');
- }
- ?>
41. 把文本转换成图片
- <?php
- header("Content-type: image/png");
- $string = $_GET['text'];
- $im = imagecreatefrompng("images/button.png");
- $color = imagecolorallocate($im, 255, 255, 255);
- $px = (imagesx($im) - 7.5 * strlen($string)) / 2;
- $py = 9;
- $fontSize = 1;
- imagestring($im, fontSize, $px, $py, $string, $color);
- imagepng($im);
- imagedestroy($im);
- ?>
42. 获取远程文件的大小
- function remote_filesize($url, $user = "", $pw = "")
- {
- ob_start();
- $ch = curl_init($url);
- curl_setopt($ch, CURLOPT_HEADER, 1);
- curl_setopt($ch, CURLOPT_NOBODY, 1);
- if(!emptyempty($user) && !emptyempty($pw))
- {
- $headers = array('Authorization: Basic ' . base64_encode("$user:$pw"));
- curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
- }
- $ok = curl_exec($ch);
- curl_close($ch);
- $head = ob_get_contents();
- ob_end_clean();
- $regex = '/Content-Length:\s([0-9].+?)\s/';
- $count = preg_match($regex, $head, $matches);
- return isset($matches[1]) ? $matches[1] : "unknown";
- }
语法
- <?php
- $file = "http://www.phpfensi.com/images/logo.png";
- $size = remote_filesize($url);
- echo $size;
- ?>
43. 使用 imagebrick 进行 pdf 到图像的转换
- <?php
- $pdf_file = './pdf/demo.pdf';
- $save_to = './jpg/demo.jpg'; //make sure that apache has permissions to write in this folder! (common problem)
- //execute ImageMagick command 'convert' and convert PDF to JPG with applied settings
- exec('convert "'.$pdf_file.'" -colorspace RGB -resize 800 "'.$save_to.'"', $output, $return_var);
- if($return_var == 0) { //if exec successfuly converted pdf to jpg
- print "Conversion OK";
- }
- else print "Conversion failed.".$output;
- ?>
44. 使用 tinyurl 生成短网址
- function get_tiny_url($url)
- {
- $ch = curl_init();
- $timeout = 5;
- curl_setopt($ch,CURLOPT_URL,'http://tinyurl.com/api-create.php?url='.$url);
- curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
- curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,$timeout);
- $data = curl_exec($ch);
- curl_close($ch);
- return $data;
- }
语法:
- <?php
- $url = "http://blog.koonk.com/2015/07/Hello-World";
- $tinyurl = get_tiny_url($url);
- echo $tinyurl;
- ?>
45. youtube 下载链接生成器
使用下面的 PHP 片段可以让你的用户下载 Youtube 视频
- function str_between($string, $start, $end)
- {
- $string = " ".$string; $ini = strpos($string,$start); if ($ini == 0) return ""; $ini += strlen($start); $len = strpos($string,$end,$ini) - $ini; return substr($string,$ini,$len); }
- function get_youtube_download_link(){
- $youtube_link = $_GET['youtube'];
- $youtube_page = file_get_contents($youtube_link);
- $v_id = str_between($youtube_page, "&video_id=", "&");
- $t_id = str_between($youtube_page, "&t=", "&");
- $flv_link = "http://www.youtube.com/get_video?video_id=$v_id&t=$t_id";
- $hq_flv_link = "http://www.youtube.com/get_video?video_id=$v_id&t=$t_id&fmt=6";
- $mp4_link = "http://www.youtube.com/get_video?video_id=$v_id&t=$t_id&fmt=18";
- $threegp_link = "http://www.youtube.com/get_video?video_id=$v_id&t=$t_id&fmt=17";
- echo "\t\tDownload (right-click > save as):\n\t\t";
- echo "<a href=\"$flv_link\">FLV</a>\n\t\t";
- echo "<a href=\"$hq_flv_link\">HQ FLV (if available)</a>\n\t\t";
- echo "<a href=\"$mp4_link\">MP4</a>\n\t\t";
- echo "<a href=\"$threegp_link\">3GP</a>\n";
- }
46. Facebook 样式的时间戳
- Facebook (x mins age, y hours ago etc)
- function nicetime($date)
- {
- if(emptyempty($date)) {
- return "No date provided";
- }
- $periods = array("second", "minute", "hour", "day", "week", "month", "year", "decade");
- $lengths = array("60","60","24","7","4.35","12","10");
- $now = time();
- $unix_date = strtotime($date);
- // check validity of date
- if(emptyempty($unix_date)) {
- return "Bad date";
- }
- // is it future date or past date
- if($now > $unix_date) {
- $difference = $now - $unix_date;
- $tense = "ago";
- } else {
- $difference = $unix_date - $now;
- $tense = "from now";
- }
- for($j = 0; $difference >= $lengths[$j] && $j < count($lengths)-1; $j++) {
- $difference /= $lengths[$j];
- }
- $difference = round($difference);
- if($difference != 1) {
- $periods[$j].= "s";
- }
- return "$difference $periods[$j] {$tense}";
- }
语法:
- <?php
- $date = "2015-07-05 03:45";
- $result = nicetime($date); // 2 days ago
- ?>
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