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[] as $match){
if(!in_array($match, $temp)){
$temp[$match] = $temp[$match] + ;
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:
dog:
cat:
monkey:
二、随机颜色生成器 function randomColor() {
$str = '#';
for($i = ; $i < ; $i++) {
$randNum = rand( , );
switch ($randNum) {
case : $randNum = 'A'; break;
case : $randNum = 'B'; break;
case : $randNum = 'C'; break;
case : $randNum = 'D'; break;
case : $randNum = 'E'; break;
case : $randNum = 'F'; break;
}
$str .= $randNum;
}
return $str;
}
$color = randomColor();
三、从网上下载文件 set_time_limit();
// 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、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) > ){
$row = mysql_fetch_array($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();
}else{
header("Location: /");
exit;
}
五、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, , , );
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($dst_im);
六、检查网站是否宕机 function Visit($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, );
curl_setopt ($ch,CURLOPT_VERBOSE,false);
curl_setopt($ch, CURLOPT_TIMEOUT, );
curl_setopt($ch,CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch,CURLOPT_SSLVERSION,);
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>= && $httpcode<) return true;
else return false;
}
if (Visit("http://www.google.com"))
echo "Website OK"."n";
else
echo "Website DOWN";
这篇文章主要介绍了10个超实用的PHP代码样例:黑名单过滤、随机颜色生成器、从网上下载文件、强制下载文件、截取图片、检查网站是否宕机,需要的朋友可以参考下
一、黑名单过滤
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
|
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
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
|
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
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
|
set_time_limit(0); // Supports all file types // URL Here: $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、强制下载文件
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
|
$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 ;
} |
五、截取图片
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
|
$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 );
|
六、检查网站是否宕机
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
|
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;
} echo "Website OK" . "n" ;
else echo "Website DOWN" ;
|
以上就是6个超实用的PHP代码样例,希望对大家学习PHP编程有所帮助,果断收藏吧