10个实用的PHP代码片段
发布时间：2020-05-25 06:37:11 所属栏目：PHP 来源：互联网
导读：10个实用的PHP代码片段
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下面是脚本之家 jb51.cc 通过网络收集整理的代码片段。 脚本之家小编现在分享给大家，也给大家做个参考。
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,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($handle);
四、Alexa/Google Page Rankfunction page_rank($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($ch,'https://feedburner.google.com/api/awareness/1.0/GetFeedData?id=7qkrmib4r9rscbplq5qgadiiq4');
curl_setopt($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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