46 Very Useful PHP Code Snippets (3)-PHP Tutorial-php.cn

31. 删除文件夹内容

[代码]php代码：

function Delete($path)
{
    if (is_dir($path) === true)
    {
        $files = array_diff(scandir($path), array(&#39;.&#39;, &#39;..&#39;));
        foreach ($files as $file)
        {
            Delete(realpath($path) . &#39;/&#39; . $file);
        }
        return rmdir($path);
    }
    else if (is_file($path) === true)
    {
        return unlink($path);
    }
    return false;
}

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语法：

$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

[代码]php代码：

function highlighter_text($text, $words)
{
    $split_words = explode( " " , $words );
    foreach($split_words as $word)
    {
        $color = "#4285F4";
        $text = preg_replace("|($word)|Ui" ,
            "<b>$1</b>" , $text );
    }
    return $text;
}

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语法：

$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

[代码]php代码：

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",&#39;w&#39;);
fwrite($fp, $rawdata); 
fclose($fp);
}

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语法：

$url = "http://koonk.com/images/logo.png";

$rename = "koonk.png";

imagefromURL($url,$rename);

35. 检测 URL 是否有效

[代码]php代码：

function isvalidURL($url)
{
$check = 0;
if (filter_var($url, FILTER_VALIDATE_URL) !== false) {
  $check = 1;
}
return $check;
}

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语法：

$url = "http://koonk.com";

$check = checkvalidURL($url);

echo $check; //if returns 1 then URL is valid.

36. 生成二维码

[代码]php代码：

function qr_code($data, $type = "TXT", $size =&#39;150&#39;, $ec=&#39;L&#39;, $margin=&#39;0&#39;)  
{
     $types = array("URL" =--> "http://", "TEL" => "TEL:", "TXT"=>"", "EMAIL" => "MAILTO:");
    if(!in_array($type,array("URL", "TEL", "TXT", "EMAIL")))
    {
        $type = "TXT";
    }
    if (!preg_match(&#39;/^&#39;.$types[$type].&#39;/&#39;, $data))
    {
        $data = str_replace("\\", "", $types[$type]).$data;
    }
    $ch = curl_init();
    $data = urlencode($data);
    curl_setopt($ch, CURLOPT_URL, &#39;http://chart.apis.google.com/chart&#39;);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, &#39;chs=&#39;.$size.&#39;x&#39;.$size.&#39;&cht=qr&chld=&#39;.$ec.&#39;|&#39;.$margin.&#39;&chl=&#39;.$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;
}

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语法：

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

[代码]php代码：

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(&#39;miles&#39;,&#39;feet&#39;,&#39;yards&#39;,&#39;kilometers&#39;,&#39;meters&#39;); 
}

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语法：

$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

[代码]php代码：

function getTweets($hash_tag) {
    $url = &#39;http://search.twitter.com/search.atom?q=&#39;.urlencode($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 ($ch);
    //If you want to see the response from Twitter, uncomment this next part out:
    //echo "<p>Response:</p>";
    //echo "<pre class="brush:php;toolbar:false">".htmlspecialchars($xml)."

"; $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 ; }

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39. 添加 th,st,nd 或者 rd 作为数字的后缀

Friday the 13th

[代码]php代码：

function ordinal($cdnl){ 
    $test_c = abs($cdnl) % 10; 
    $ext = ((abs($cdnl) %100 < 21 && abs($cdnl) %100 > 4) ? &#39;th&#39;
            : (($test_c < 4) ? ($test_c < 3) ? ($test_c < 2) ? ($test_c < 1) 
            ? &#39;th&#39; : &#39;st&#39; : &#39;nd&#39; : &#39;rd&#39; : &#39;th&#39;)); 
    return $cdnl.$ext; 
}

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语法：

$number = 10;

echo ordinal($number); //output is 10th

40. 限制文件下载的速度

[代码]php代码：

<!--?php
// local file that should be send to the client
$local_file = &#39;test-file.zip&#39;;
// filename that the user gets as default
$download_file = &#39;your-download-name.zip&#39;;
  
// set the download rate limit (=--> 20,5 kb/s)
$download_rate = 20.5; 
if(file_exists($local_file) && is_file($local_file)) {
    // send headers
    header(&#39;Cache-control: private&#39;);
    header(&#39;Content-Type: application/octet-stream&#39;); 
    header(&#39;Content-Length: &#39;.filesize($local_file));
    header(&#39;Content-Disposition: filename=&#39;.$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($file);}
else {
    die(&#39;Error: The file &#39;.$local_file.&#39; does not exist!&#39;);
}
?>

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41. 把文本转换成图片

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

[代码]php代码：

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))
    {
        $headers = array(&#39;Authorization: Basic &#39; .  <a href="http://www.php-z.com/" target="_blank" class="relatedlink">Base</a>64_encode("$user:$pw"));
        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
    }
    $ok = curl_exec($ch);
    curl_close($ch);
    $head = ob_get_contents();
    ob_end_clean();
    $regex = &#39;/Content-Length:\s([0-9].+?)\s/&#39;;
    $count = preg_match($regex, $head, $matches);
    return isset($matches[1]) ? $matches[1] : "unknown";
}

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语法：

$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

$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

[代码]php代码：

function get_tiny_url($url)  
{  
    $ch = curl_init();  
    $timeout = 5;  
    curl_setopt($ch,CURLOPT_URL,&#39;http://tinyurl.com/api-create.php?url=&#39;.$url);  
    curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);  
    curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,$timeout);  
    $data = curl_exec($ch);  
    curl_close($ch);  
    return $data;  
}

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语法：

$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

[代码]php代码：

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[&#39;youtube&#39;];
    $youtube_page = file_get_contents($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><br><br>\n";
}

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46. Facebook 样式的时间戳

Facebook (x mins age, y hours ago etc)

[代码]php代码：

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}";
}

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语法：

$date = "2015-07-05 03:45";

$result = nicetime($date); // 2 days ago

以上就是46 个非常有用的 PHP 代码片段（三）的内容，更多相关内容请关注PHP中文网（m.sbmmt.com）！