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（$xml_string）; //loop through the each node of moleculeforeach （$xml->molecule as $record）{//attribute are accessted byecho $record["name"], " ";//node are accessted by -> operatorecho $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：

<?phpecho "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
", $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 .= "
";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：

<?phpheader（"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 13thfunction 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（$local_file）） {// send headersheader（"Cache-control: private"）;header（"Content-Type: application/octet-stream"）;header（"Content-Length: ".filesize（$local_file））;header（"Content-Disposition: filename=".$download_file）;// flush contentflush（）;// open file stream$file = fopen（$local_file, "r"）;while（！feof（$file）） {// send the current file part to the browserprint fread（$file, round（$download_rate * 1024））;// flush the content to the browserflush（）;// sleep one secondsleep（1）;}// close file streamfclose（$file）;}else {die（"Error: The file ".$local_file." does not exist！"）;}?>

41. 把文本转换成图片

<?phpheader（"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 settingsexec（"convert "".$pdf_file."" -colorspace RGB -resize 800 "".$save_to.""", $output, $return_var）;if（$return_var == 0） { //if exec successfuly converted pdf to jpgprint "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=$t_id&fmt=17";echo "		Download （right-click > save as）:
		";echo "<a href="$flv_link">FLV</a>
		";echo "<a href="$hq_flv_link">HQ FLV （if available）</a>
		";echo "<a href="$mp4_link">MP4</a>
		";echo "<a href="$threegp_link">3GP</a>
";}

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（$date）;// check validity of dateif（empty（$unix_date）） {return "Bad date";}// is it future date or past dateif（$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。