有哪些 不錯的PHP代碼樣例可以參考？

WEB程序員，PHP一定是必備的，即使你沒用它開發過大型軟體項目，也一定多少了解它的語法。

儘管PHP經常被人詬病，被人貶低，被人當玩笑開，事實證明，PHP是全世界網站開發中使用率最高的編程語言。PHP最大的缺點是太簡單，語法不嚴謹，框架體系很弱，但這也是它最大的優點，一個有點編程背景的普通人，只需要學習PHP半天時間，就可以上手開始開發web應用了。

網上有人總結幾種編程語言的特點，我覺得也挺有道理的：

PHP 就是： Quick and Dirty

Java 就是： Beauty and Slowly

Ruby 就是： Quick andBeauty

Python 就是：Quick and Simple

在PHP的流行普及中，網上總結出了很多實用的PHP代碼片段，這些代碼片段在當你遇到類似的問題時，粘貼過去就可以使用，非常的高效，非常的省時省力。將這些程序員前輩總結出的優秀代碼放到自己的知識庫中，是一個善於學習的程序員的好習慣。

有哪些好的PHP代碼樣例值得收藏起來呢？

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Zend Framework, 不二之選。

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第一次嘗試知乎的自問自答。希望可以拋磚引玉~

一、黑名單過濾

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、隨機顏色生成器

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、從網路下載文件

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, true);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, 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-autoch=6-1484155081features=Rankq=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("~&&(.+?) &~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、強制下載文件

$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、通過Email顯示用戶的Gravatar頭像

$gravatar_link = "http://www.gravatar.com/avatar/" . md5($comment_author_email) . "?s=32";
echo "&";


七、通過cURL獲取RSS訂閱數

$ch = curl_init();
curl_setopt($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、時間差異計算函數

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、裁剪圖片

$filename= "test.jpg";
list($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、檢查網站是否宕機

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";

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優秀代碼話，推薦你去看看別人寫的一些框架，因為接觸，會使用的框架不多，但是現在特別喜歡一個款國人開發的thinkphp框架，非常不錯，推薦你去看看

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可以研讀類似yii2、laravel框架的源碼，如果讀通一個，個人認為會有質的變化。

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