欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  IT编程

PHP开发中常用的十个代码样例

程序员文章站 2024-04-01 11:09:34
一、黑名单过滤 function is_spam($text, $file, $split = ‘:‘, $regex = false){ $handle =...

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、从网上下载文件

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、用email显示用户的gravator头像

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

七、用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

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、截取图片

$filename= "test.jpg"; 
list($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"; 

以上内容针对php开发中常用的十个代码样例做了总结,希望对大家有所帮助。