10 code sample _php examples commonly used in PHP development

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; 
} 

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);

Four, 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)" > (. +?) </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 '); 

V. 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; 
}

VI, using email to display the user's gravator avatar

$gravatar _link = ' http://www.gravatar.com/avatar/'. MD5 ($comment _author_email). ' S=32 '; 

Seven, use curl to get the number of RSS subscriptions

$ch = Curl_init (); 
curl_setopt ($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); 

Viii. Time Difference Calculation

Function ago ($time) 
{ 
$periods = Array ("Second", "Minute", "Hour", "Day", "Week", "Month", "year", "decade"); 
    $lengths = Array ("A", "" "," "," 7 "," 4.35 "," a "," ten "); 
$now = time (); 
$difference = $now-$time; 
$tense = "Ago"; 
for ($j = 0; $difference >= $lengths [$j] && $j < count ($lengths)-1; $j + +) { 
$difference/= $lengths [$j];< c9/>} 
$difference = round ($difference); 
if ($difference!= 1) { 
$periods [$j].= "S"; 
} 
Return "$difference $periods [$j] ' ago '"; 
}

Ix. 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); 

Ten, check whether the website 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 

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