必须收藏的php实用代码片段

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://koonk.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(!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

<?php
$file = "http://koonk.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($date)
{
  if(empty($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：

<?php
$date = "2015-07-05 03:45";
$result = nicetime($date); // 2 days ago
?>

以上就是本文的全部内容，希望对大家的学习有所帮助。