6 _php instance of PHP code fragment

One, blacklist filtration

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 ' is not spam '; 
 
Ab:3 
dog:3 
cat:2 

Second, random color generator

function Randomcolor () { 
  $str = ' # '; 
  for ($i = 0; $i < 6; $i + +) { 
    $randNum = rand (0); 
    Switch ($randNum) {case 
      : $randNum = ' A '; 
      Case one: $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 (); 

Third, download files from the Internet

Set_time_limit (0); 
Supports all file types 
//URLs 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, with free up system 
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); 

Iv. Force Download files

$filename = $_get[' file ']; Get the Fileid from the URL 
//Query the file id 
$query = sprintf ("SELECT * FROM tablename WHERE ID = '%s '", MYSQ L_real_escape_string ($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; 
} 

V. Interception of pictures

$filename = "Test.jpg"; 
List ($w, $h, $type, $attr) = getimagesize ($filename); 
$src _im = Imagecreatefromjpeg ($filename); 
 
$src _x = ' 0 '; Begin x 
$src _y = ' 0 ';//Begin y 
$src _w = ' m ';//width 
$src _h = ' m ';//height 
$dst _x = ' 0 ';//DE Stination 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); 

Six, check whether the site is down

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"; 

The above is 6 Super practical PHP code sample, I hope to learn more about PHP programming help, Resolute Collection bar