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10个实用的PHP代码片段

下面是编程之家 jb51.cc 通过网络收集整理的代码片段。

编程之家小编现在分享给大家,也给大家做个参考。

  • PHP就是: Quick and Dirty
  • Java就是: Beauty and Slowly
  • Ruby就是: Quick and Beauty
  • python就是: Quick and Simple

一、黑名单过滤

function is_spam($text,$file,$split = ':',$regex = false){ 
    $handle = fopen($file,'rb'); 
    $contents = fread($handle,filesize($file)); 
    fclose($handle); 
    $lines = explode("n",$contents); 
    $arr = array(); 
    foreach($lines as $line){ 
        list($word,$count) = explode($split,$line); 
        if($regex) 
            $arr[$word] = $count; 
        else 
            $arr[preg_quote($word)] = $count; 
    } 
    preg_match_all("~".implode('|',array_keys($arr))."~",$text,$matches); 
    $temp = array(); 
    foreach($matches[0] as $match){ 
        if(!in_array($match,$temp)){ 
            $temp[$match] = $temp[$match] + 1; 
            if($temp[$match] >= $arr[$word]) 
                return true; 
        } 
    } 
    return false; 
} 

$file = 'spam.txt'; 
$str = 'This string has cat,dog word'; 
if(is_spam($str,$file)) 
    echo 'this is spam'; 
else 
    echo 'this is not spam';
ab:3
dog:3
cat:2
monkey:2

二、随机颜色生成

function randomColor() { 
    $str = '#'; 
    for($i = 0 ; $i < 6 ; $i++) { 
        $randNum = rand(0,15); 
        switch ($randNum) { 
            case 10: $randNum = 'A'; break; 
            case 11: $randNum = 'B'; break; 
            case 12: $randNum = 'C'; break; 
            case 13: $randNum = 'D'; break; 
            case 14: $randNum = 'E'; break; 
            case 15: $randNum = 'F'; break; 
        } 
        $str .= $randNum; 
    } 
    return $str; 
} 
$color = randomColor();

三、从网络下载文件

set_time_limit(0); 
// Supports all file types 
// URL Here: 
$url = 'http://somsite.com/some_video.flv'; 
$pi = pathinfo($url); 
$ext = $pi['extension']; 
$name = $pi['filename']; 

// create a new cURL resource 
$ch = curl_init(); 

// set URL and other appropriate options 
curl_setopt($ch,CURLOPT_URL,$url); 
curl_setopt($ch,CURLOPT_HEADER,false); 
curl_setopt($ch,CURLOPT_BINARYTRANSFER,true); 
curl_setopt($ch,CURLOPT_AUTOREFERER,CURLOPT_FOLLOWLOCATION,CURLOPT_RETURNTRANSFER,true); 

// grab URL and pass it to the browser 
$opt = curl_exec($ch); 

// close cURL resource,and free up system resources 
curl_close($ch); 

$saveFile = $name.'.'.$ext; 
if(preg_match("/[^0-9a-z._-]/i",$saveFile)) 
$saveFile = md5(microtime(true)).'.'.$ext; 

$handle = fopen($saveFile,'wb'); 
fwrite($handle,$opt); 
fclose($handle);

四、Alexa/Google Page Rank

function page_rank($page,$type = 'alexa'){ 
    switch($type){ 
        case 'alexa': 
            $url = 'http://alexa.com/siteinfo/'; 
            $handle = fopen($url.$page,'r'); 
            break; 
        case 'google': 
            $url = 'http://google.com/search?client=navclient-auto&ch=6-1484155081&features=Rank&q=info:';
            $handle = fopen($url.'http://'.$page,'r'); 
            break; 
    } 
    $content = stream_get_contents($handle); 
    fclose($handle); 
    $content = preg_replace("~(n|t|ss+)~",'',$content); 
    switch($type){ 
        case 'alexa': 
            if(preg_match('~<div class="data (down|up)"><img.+?>(.+?) </div>~im',$content,$matches)){ 
                return $matches[2]; 
            }else{ 
            return FALSE; 
            } 
            break; 
        case 'google': 
            $rank = explode(':',$content); 
            if($rank[2] != '') 
                return $rank[2]; 
            else 
                return FALSE; 
            break; 
        default: 
            return FALSE; 
            break; 
    } 
} 
// Alexa Page Rank: 
echo 'Alexa Rank: '.page_rank('techug.com'); 
echo '
'; 
// Google Page Rank 
echo 'Google Rank: '.page_rank('techug.com','google');

五、强制下载文件

$filename = $_GET['file']; //Get the fileid from the URL 
// Query the file ID 
$query = sprintf("SELECT * FROM tableName WHERE id = '%s'",MysqL_real_escape_string($filename)); 
$sql = MysqL_query($query); 
if(MysqL_num_rows($sql) > 0){ 
    $row = MysqL_fetch_array($sql); 
    // Set some headers 
    header("Pragma: public"); 
    header("Expires: 0"); 
    header("Cache-Control: must-revalidate,post-check=0,pre-check=0"); 
    header("Content-Type: application/force-download"); 
    header("Content-Type: application/octet-stream"); 
    header("Content-Type: application/download"); 
    header("Content-disposition: attachment; filename=".basename($row['FileName']).";"); 
    header("Content-transfer-encoding: binary"); 
    header("Content-Length: ".filesize($row['FileName'])); 

    @readfile($row['FileName']); 
    exit(0); 
}else{ 
    header("Location: /"); 
    exit; 
}

六、通过Email显示用户的Gravatar头像

$gravatar_link = 'http://www.gravatar.com/avatar/' . md5($comment_author_email) . '?s=32';
echo '<img src="' . $gravatar_link . '" />';

七、通过cURL获取RSS订阅

$ch = curl_init();
curl_setopt($ch,'https://Feedburner.google.com/api/awareness/1.0/GetFeedData?id=7qkrmib4r9rscbplq5qgadiiq4');
curl_setopt($ch,1);
curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,2);
$content = curl_exec($ch);
$subscribers = get_match('/circulation="(.*)"/isU',$content);
curl_close($ch);

八、时间差异计算函数

function ago($time)
{
    $periods = array("second","minute","hour","day","week","month","year","decade");
    $lengths = array("60","60","24","7","4.35","12","10");
    $Now = time();
    $difference = $Now - $time;
    $tense = "ago";
    for($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] 'ago' ";
}

九、裁剪图片

$filename= "test.jpg";
list($w,$h,$type,$attr) = getimagesize($filename);
$src_im = imagecreatefromjpeg($filename);

$src_x = '0'; // begin x
$src_y = '0'; // begin y
$src_w = '100'; // width
$src_h = '100'; // height
$dst_x = '0'; // destination x
$dst_y = '0'; // destination y

$dst_im = imagecreatetruecolor($src_w,$src_h);
$white = imagecolorallocate($dst_im,255,255);
imagefill($dst_im,$white);

imagecopy($dst_im,$src_im,$dst_x,$dst_y,$src_x,$src_y,$src_w,$src_h);

header("Content-type: image/png");
imagepng($dst_im);
imagedestroy($dst_im);

十、检查网站是否宕机

function Visit($url){
    $agent = "Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)";$ch=curl_init();
    curl_setopt ($ch,$url );
    curl_setopt($ch,CURLOPT_USERAGENT,$agent);
    curl_setopt ($ch,1);
    curl_setopt ($ch,CURLOPT_VERBOSE,false);
    curl_setopt($ch,CURLOPT_TIMEOUT,5);
    curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,FALSE);
    curl_setopt($ch,CURLOPT_SSLVERSION,3);
    curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,FALSE);
    $page=curl_exec($ch);
    //echo curl_error($ch);
    $httpcode = curl_getinfo($ch,CURLINFO_HTTP_CODE);
    curl_close($ch);
    if($httpcode>=200 && $httpcode<300) return true;
    else return false;
}
if (Visit("http://www.google.com"))
    echo "Website OK"."n";
else
    echo "Website DOWN";

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