10个超级有用的PHP代码样例，猿们，赶紧收藏吧~

作为一个正常的程序员，会好几种语言是十分正常的，相信大部分程序员也都会编写几句PHP程序；如果你是WEB程序员，那么PHP是必备的一门语言，即使你没用它开发过大型软件项目，也一定多少了解它的语法。

尽管PHP经常被人诟病，被人贬低，被人当玩笑开，事实证明，PHP是全世界网站开发中使用率最高的编程语言。

PHP最大的缺点是太简单，语法不严谨，框架体系很弱，但这也是它最大的优点，一个有点编程背景的普通人，只需要学习PHP半天时间，就可以上手开始开发web应用了。

网上有人总结几种编程语言的特点，我觉得也挺有道理的：

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

在PHP的流行普及中，网上总结出了很多实用的PHP代码片段，这些代码片段在当你遇到类似的问题时，粘贴过去就可以使用，非常的高效，非常的省时省力。将这些程序员前辈总结出的优秀代码放到自己的知识库中，是一个善于学习的程序员的好习惯。

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; 
        elsearr[preg_quote(word)] =count; 
    } 
    preg_match_all("~".implode('|', array_keys(arr))."~",text, matches);temp = array(); 
    foreach(matches[0] asmatch){ 
        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';

输出：

ab:3
dog:3
cat:2
monkey:2

二、随机颜色生成器

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 resourcech = 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, true); 
curl_setopt(ch, CURLOPT_FOLLOWLOCATION, true); 
curl_setopt(ch, CURLOPT_RETURNTRANSFER, true); 

// grab URL and pass it to the browseropt = 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)){ 
                returnmatches[2]; 
            }else{ 
            return FALSE; 
            } 
            break; 
        case 'google': 
            rank = explode(':',content); 
            if(rank[2] != '') 
                returnrank[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订阅数

$ch = curl_init();
curl_setopt($ch,CURLOPT_URL,'https://feedburner.google.com/api/awareness/1.0/GetFeedData?id=7qkrmib4r9rscbplq5qgadiiq4');
curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
curl_setopt($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] && jlengths)-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, 255);
imagefill($dst_im, 0, 0, $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, CURLOPT_URL,url );
    curl_setopt(ch, CURLOPT_USERAGENT, agent);
    curl_setopt (ch, CURLOPT_RETURNTRANSFER, 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";

via: techug