10个超级有用、必须收藏的PHP代码样例

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。虽然很多内容还不是太理解，不过先收集整理出来。

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 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-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] && $j < count($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, 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";