分享php实用代码片段编写方法

本篇内容主要讲解"分享php实用代码片段编写方法"，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习"分享php实用代码片段编写方法"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：

25. 解析 XML 数据

$xml_string="      ben    A        h3o    K  ";   //load the xml string using simplexml function$xml = simplexml_load_string($xml_string);   //loop through the each node of moleculeforeach ($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 dataecho $obj->name; //displays rolfecho $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：

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 = $value . "";    echo '
'.$content.'  
';      }      }  }  }

语法：

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：

30. 计算两个日期的差

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 '
';print_r( _date_diff( strtotime($date), time() ) );echo '
';?>

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：

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" ,      "$1" , $text );  }  return $text;}

语法：

33. 写入文件

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：

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：

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：

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：

 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 "
Connecting to $url ...
";  $ch = curl_init($url);  curl_setopt ($ch, CURLOPT_RETURNTRANSFER, TRUE);  $xml = curl_exec ($ch);  curl_close ($ch);  //If you want to see the response from Twitter, uncomment this next part out:  //echo "
Response:
";  //echo "
".htmlspecialchars($xml)."
";  $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 = $entry->id;    echo "
Tweet from ".$author.": ".$text." Posted ".date('n/j/y g:i a',$time)."
";  }  return true ;}

39. 添加 th,st,nd 或者 rd 作为数字的后缀

Friday the 13thfunction ordinal($cdnl){  $test_c = abs($cdnl) % 10;  $ext = ((abs($cdnl) 0 < 21 && abs($cdnl) 0 > 4) ? 'th'      : (($test_c < 4) ? ($test_c < 3) ? ($test_c < 2) ? ($test_c < 1)      ? 'th' : 'st' : 'nd' : 'rd' : 'th'));  return $cdnl.$ext;}

语法：

40. 限制文件下载的速度

 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

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(!empty($user) && !empty($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

43. 使用 imagebrick 进行 pdf 到图像的转换

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：

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 "FLV\n\t\t";  echo "HQ FLV (if available)\n\t\t";  echo "MP4\n\t\t";  echo "3GP\n";}

46. Facebook 样式的时间戳

Facebook (x mins age, y hours ago etc)function nicetime($date){  if(empty($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(empty($unix_date)) {      return "Bad date";  }  // is it future date or past date  if($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：

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