October 14th, 2009
PHP – Simple caching
What should be on the main page?? Correctly, there should be ponemnozhku from each unit of a site. And certainly your page is under construction automatically, proceeding from contents of forums, news lines and other sections of a site.
What should be on the main page?? Correctly, there should be ponemnozhku from each unit of a site. And certainly your page is under construction automatically, proceeding from contents of forums, news lines and other sections of a site.
How much SQL searches it is carried out at loading the main page?? How much blocks are pumped up from other sites??
Now we shall consider a simple and effective way of caching of such data.
As an example we shall consider a case of import of news from the external server: http://news.novgorod.ru/ultramode.txt
Our problem{task} to receive this file, to process it{him} and to deduce{remove} to his{its} user. The program doing{making} it, looks as follows:
<?
$d = file (” http: // news.novgorod.ru/ultramode.txt “);
for ($i=0; $i <11; $i ++) {
$msg = $ d [2 + $ i*8];
$url = $ d [3 + $ i*8];
$date = $ d [4 + $ i*8];
print ” <a href =’http: // news.novgorod.ru ” .trim ($url). ” ‘> “;
print trim ($msg.) ” </a> (“. $date. “)”;
}
?>
At each loading our page there is a reference{manipulation} to the external server news.novgorod.ru, therefrom under report HTTP the file ultramode.txt is downloaded. And now we shall present a situation, that the server is on the other end of a planet and connection and furthermore the file transfer borrows{occupies} enough more time. Or moreover, the server can be temporarily inaccessible.
Conclusion. What for each time podgruzhat` a file ultamode.txt if news are updated not more often than an once at two – three o’clock?? Correctly. It is necessary kehshirovat`.
And we shall do{make} it very simply. As you could notice, the comment is stored{kept} in the first line of a file. The comment is not necessary for us and on his{its} place it is possible to place date of last updating of a file wonderfully.
Algorithm of job the following:
1. We read – out kehshirovannuju the version
2. If kehshirovannaja the version is obsolete, on its{her} place we read – out a file http://news.novgorod.ru/ultramode.txt, we replace the first line with current time and is saved in a cache.
3. We make out and is deduced{removed} given to the user.
The code making all this is below resulted:
<?
// We read – out a file from a cache
$d = file (“/tmp/news.cache”);
$fs=trim ($d [1]);
// If the file was not updated 3600 seconds (1 hour) or the file is empty,
// That we update it{him}
if (intval ($d [0]) <time ()-600 || empty ($fs)) {
$d = file (” http: // news.novgorod.ru/ultramode.txt “);
$fs=trim ($d [1]);
// We save new versju in a cache
if (! empty ($fs)) {
$fw=fopen (“/tmp/news.cache”, “wt”);
flock ($fw, LOCK_EX);
// In the first line we shall write down current time
fputs ($fw, time (). “n”);
// We shall save other lines
for ($i=1; $i <count ($d); $i ++) fputs ($fw, trim ($d [$i]). “n”);
fclose ($fw);
}
// If, for some reason, the file has not been downloaded,
// That we shall use kehshirovannoj the version
else $d = file (“/tmp/news.cache”);
}
// A conclusion of the data
for ($i=0; $i <11; $i ++) {
$msg = $ d [2 + $ i*8];
$url = $ d [3 + $ i*8];
$date = $ d [4 + $ i*8];
print ” <a href =’http: // news.novgorod.ru ” .trim ($url). ” ‘> “;
print trim ($msg.) ” </a> (“. $date. “)”;
}
That’s all. In the same way it is possible kehshirovat` and SQL searches. Using this mechanism I managed to reduce time of creation of the main page with 1.5 sek till 0.05 sek
How to send letters PHP attachami
How to send the letter in HTML a kind? Attach to the letter attach with the name message.html and the letter to turn to the HTML-letter!
<?
// Functions. It is possible to bear{take out} in dpugoj a file.
class html_mime_mail {
var $headers;
var $multipart;
var $mime;
var $html;
var $parts = array ();
function html_mime_mail ($headers = “”) {
$this-> headers = $ headers;
}
function add_html ($html = “”) {
$this-> html. = $ html;
}
function build_html ($orig_boundary, $kod) {
$this-> multipart. = ” – $orig_boundaryn “;
if ($kod == ‘w’ || $kod == ‘win’ || $kod == ‘windows-1251′) $kod =’windows-1251 ‘;
else $kod =’koi8-r ‘;
$this-> multipart. = ” Content-Type: text/html; charset = $ kodn “;
$this-> multipart. = ” BCC: del@ipo.spb.run “;
$this-> multipart. = ” Content-Transfer-Encoding: Quot-Printednn “;
$this-> multipart. = ” $ this-> htmlnn “;
}
function add_attachment ($path = “”, $name = ” “, $c_type = “application/octet-stream”) {
if (! file_exists ($path. $ name)) {
print ” File $path. $ name dosn’t exist. “;
return;
}
$fp=fopen ($path. $ name, “r”);
if (! $fp) {
print ” File $path. $ name coudn’t be read. “;
return;
}
$file=fread ($fp, filesize ($path. $ name));
fclose ($fp);
$this-> parts [] =array (“body” => $file, “name” => $name, “c_type” => $c_type);
}
function build_part ($i) {
$message_part = “”;
$message_part. = ” Content-Type: “. $this-> parts [$i] ["c_type"];
if ($this-> parts [$i] ["name"]! = ” “)
$message_part. = “; name = ” “. $this-> parts [$i] ["name."] ” “n”;
else
$message_part. = “n”;
$message_part. = ” Content-Transfer-Encoding: base64n “;
$message_part. = ” Content-Disposition: attachment; filename = ” “.
$this-> parts [$i] ["name."] ” “nn”;
$message_part. = chunk_split (base64_encode ($this-> parts [$i] ["body"])). “n”;
return $message_part;
}
function build_message ($kod) {
$boundary = ” = _ “.md5 (uniqid (time));
$this-> headers. = ” MIME-Version: 1.0n “;
$this-> headers. = ” Content-Type: multipart/mixed; boundary = ” $ boundary “n”;
$this-> multipart = “”;
$this-> multipart. = ” This is a MIME encoded message.nn “;
$this-> build_html ($boundary, $kod);
for ($i = (count ($this-> parts)-1); $i> =0; $i-)
$this-> multipart. = ” – $boundaryn “. $this-> build_part ($i);
$this-> mime = ” $this-> multipart – $boundary – n “;
}
function send ($server, $to, $from, $subject = “”, $headers = “”) {
$headers = ” To: $tonFrom: $fromnSubject: $subjectnX-Mailer: The Mouse! n$headers “;
$fp = fsockopen ($server, 25, both $errno, and $errstr, 30);
if (! $fp)
die (” Server $server. Connection failed: $errno, $errstr “);
fputs ($fp, ” HELO $servern “);
fputs ($fp, ” MAIL FROM: $fromn “);
fputs ($fp, ” RCPT TO: $ton “);
fputs ($fp, “DATAn”);
fputs ($fp, $this-> headers);
if (strlen ($headers))
fputs ($fp, “$headersn”);
fputs ($fp, $this-> mime);
fputs ($fp, “n.nQUITn”);
while (! feof ($fp))
$resp. = fgets ($fp, 1024);
fclose ($fp);
}
}
// *************************************************************************
//
// In quality attacha ppisoedinjaem the html-letter (opens automatically).
// The second attach – some file from the catalogue.
// So to cause all that is written above:
//
// *************************************************************************
$mail=new html_mime_mail ();
$mail-> add_html (” <html> <body> <center> <h2> Ppivet! <br> <br> “.
” <br> I Send a binary file [/bin/ls...] “.
” </h2> </center> </body> </html> “);
$mail-> add_attachment (“/bin / “, “ls”);
$mail-> build_message (‘ win ‘); // if not “win”, kodipovka koi8
$mail-> send (‘ POCHTOVYJJ_KHOST_VASHEGO_PROVAJJDERA ‘,
‘ TO WHOM _ (E-MAIL) ‘,
‘ OT_KOGO _ (E-MAIL) ‘,
‘ SUBJECT OF THE LETTER ‘);
//
// After arrival of the letter we swing on FTP original/bin/ls and it is compared with
// Imported from the letter:
//
// X:temp> fc/b ls ls2
// Comparison of files ls and LS2
// FC: distinctions are not found
//
//
// Attention! If you do not have file/bin/ls it is simple zakommentirujte a line
// $mail-> add_attachment (“/bin / “, “ls”) that the program did not try to attach
// To the letter necuhhestvujuhhie files.
//
?>
