Summary of some of the functions commonly used in PHP (induction)

This article introduces to you about some of the common functions of PHP Summary (induction), there is a certain reference value, the need for friends can refer to, I hope to help you.

1. Get the Web site http or https?

$http _type = ((Isset ($_server[' https ") && $_server[' https '] = = ' on ') | | (Isset ($_server[' Http_x_forwarded_proto ') && $_server[' http_x_forwarded_proto '] = = ' https ')) ? ' https://': '/HTTP ';

2. Delete empty data from the array

function Where_data ($data) {    foreach ($data as $k = = $v) {        if (empty ($v) && $v! = ' 0 ') {            unset ($data [ $k]);        }    }    return $data;}

3. Capturing part of the rich text

/** * Capture text in Rich text as part of * @param $content * @return string */function html_substr_content ($content, $length =100) {    $ Content = Htmlspecialchars_decode ($content);      Convert some of the predefined HTML entities to characters    $content = Str_replace ("", "", $content);     Replace the space with an empty    $content = Strip_tags ($content);                 The function strips HTML, XML, and PHP tags from the string to get plain text content    $con = mb_substr ($content, 0, $length, "Utf-8");   Returns the character of the first 100 string length in the string return    $con;}

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); $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 '; $str = ' This string have cat, dog word '; if (Is_spam ($str, $file)) echo ' This is spam '; Elseecho ' This is no T spam '; ab:3dog:3cat:2monkey:2

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;  }  return $STR;} $color = Randomcolor ();

Third, download the file from the Internet

Set_time_limit (0);//Supports all file types//urls here: $url = ' http://php.cn/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 Optionscurl_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 resourcescurl_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. Mandatory download of files

$filename = $_get[' file ']; Get the Fileid from the url//Query the file Id$query = sprintf ("select * from tableName WHERE ID = '%s '", Mysql_real_esc Ape_string ($filename)); $sql = mysql_query ($query), if (Mysql_num_rows ($sql) > 0) {$row = Mysql_fetch_array ($sql);// Set some headersheader ("Pragma:public"); Header ("expires:0"); Header ("Cache-control:must-revalidate, post-check=0, Pre-check=0 "); Header (" Content-type:application/force-download "); Header (" Content-type:application/octet-stream ") ); Header ("Content-type:application/download"); header ("Content-disposition:attachment; Filename= ". basename ($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 = ' 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);

Vi. checking the website for downtime

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 "; Elseecho" Website down ";

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