PHP实用代码片段(四)

2018-03-01 07:48:53来源:cnblogs.com作者:dreams7433人点击

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1. 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.?>

2. 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);?>

3. 写入文件

<?$filename = 'blog.csv';$fp = fopen($filename, 'w');$output = " Hello ";$output .= " World! ";$output .= "/r/n";fputs($fp, $output);fclose($fp);?>

4. 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);?>

5. 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.?>

6. 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");?>

7. 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).'<br />';}?>

8. 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 ;}

9. 添加 th,st,nd 或者 rd 作为数字的后缀

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?>

10. 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!');}?>

11. 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);?>

12. 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;?>

13. 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 jpg    print "Conversion OK";}else print "Conversion failed.<br />".$output;?>

14. 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;?>

15. youtube 下载链接生成器

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=$t_id&fmt=17";    echo "/t/tDownload (right-click &gt; save as)&#58;/n/t/t";    echo "<a href=/"$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><br><br>/n";}

16. 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?>

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