必须收藏的php实用代码片段

2016-02-03 09:48作者：fang

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'?>

</molecule>

</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 ''.$content.' <a class="twt" href="'.$link.'" title=""> </a>';

}

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 daysn", $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" ,

"$1" , $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 .= "rn";

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 "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 "<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 "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 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 "ttDownload (right-click > save as):ntt";

echo "<a href="$flv_link">FLV</a>ntt";

echo "<a href="$hq_flv_link">HQ FLV (if available)</a>ntt";

echo "<a href="$mp4_link">MP4</a>ntt";

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。