6 Ultra-Practical PHP code Snippets _php Instances

First, blacklist filter

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 $arr [Preg_qu OTE ($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] >= $a rr[$word]) return true; }} return false; }  $file = ' spam.txt '; $str = ' This string have cat, dog word '; if (Is_spam ($str, $file)) echo ' This is spam '; else echo ' This isn't spam ';  

Second, random color generator

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

Third, download the file 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, and free up system resources curl_close ($ch);  $saveFile = $name. '. '. $ext; if (Preg_match ("/[^0-9a-z._-]/i", $saveFile)) $saveFile = MD5 (Microtime (TRUE)). $ext;  

Iv. Mandatory download of files

$filename = $_get[' file ']; Get the Fileid from the URL//Query of the file id $query = sprintf ("select * from tableName WHERE ID = '%s '", mysql_real_e Scape_string ($filename)); $sql = mysql_query ($query); if (mysql_num_rows ($sql) > 0) {$row = Mysql_fetch_array ($sql);//Set Some headers header ("Pragma:public"); Header ("Exp Ires:0 "); Header ("Cache-control:must-revalidate, Post-check=0, pre-check=0"); Header ("Content-type:application/force-download"); Header ("Content-type:application/octet-stream"); Header ("Content-type:application/download"); Header ("content-disposition:attachment; Filename= ". basename ($row [' FileName '])."; "); Header ("Content-transfer-encoding:binary"); Header ("Content-length:". FileSize ($row [' FileName ']);  

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 = ' 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);  

Vi. checking the website for downtime

function Visit ($url) {     

The above is 6 super-practical PHP code sample, I hope that you learn PHP programming Help, a decisive collection of it

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