必须收藏的php实用代码片段

前端技术 2023/09/09 PHP

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。

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