This shows free, used and total memory. This like the other one, is somewhat complex and uses a mix of shell commands and PHP.
// displays total and free memory
// total memory
$total = popen("/usr/bin/free | grep \"Mem:\" | awk -F\" \" '{print $2}'", "r");
$read = fread($total, 2096);
$totalram = round($read / 1000, 2);
pclose($total);
// used memory
$used = popen("/usr/bin/free | grep \"Mem:\" | awk -F\" \" '{print $3}'", "r");
$read = fread($used, 2096);
$usedram = round($read / 1000, 2);
pclose($used);
// free memory
$freeram = $totalram - $usedram;
Posted at 2:49 on 4 th June 2009
This somewhat complex bit of code shows the used and free disk space on a specified volume. Uses a mix of shell commands and PHP here.
// displays disk space for the "/dev/xvda1" volume
// used space
$used = popen("/bin/df -k | grep \"xvda1\" | awk -F\" \" '{print $3}'", "r");
$read = fread($used, 2096);
$systemused = round($read / 1000000, 2);
pclose($used);
// free space
$free = popen("/bin/df -k | grep \"xvda1\" | awk -F\" \" '{print $2}'", "r");
$read = fread($free, 2096);
$systemcap = round($read / 1000000, 2);
pclose($free);
Posted at 2:47 on 4 th June 2009
Prints the current Kernel Version, eg “2.6.18-xenU”
function kernel() {
$la = popen("uname -r", "r");
$read = fread($la, 2096);
echo $read;
}
Posted at 2:44 on 4 th June 2009
This shows the Debian version number, eg “4.0”.
function debianversion() {
// naturally only works on Debian.
$la = popen("cat /etc/debian_version", "r");
$read = fread($la, 2096);
echo $read;
}
Posted at 2:43 on 4 th June 2009
This prints the machines uptime, but only in days.
function uptime() {
$la = popen("/usr/bin/uptime", "r");
$read = fread($la, 2096);
$value = substr($read, 13, 7);
echo $value;
}
Note: This should be improved to show a much more complex date/time. Not showing the time is, annoying.
Posted at 2:42 on 4 th June 2009
This example prints the load average of the machine.
function loadaverage() {
$la = popen("/usr/bin/uptime", "r");
$read = fread($la, 2096);
$value = substr($read, -17);
echo $value;
}
Printed like: “0.02, 0.01, 0.07”.
Posted at 2:40 on 4 th June 2009
The first example converts kB (kilobyte) to MB (megabyte) and the second from kB to GB (gigbyte) and rounds it to a nice 2 decimal places.
round($read / 1000, 2)
round($read / 1000000, 2)
Posted at 10:38 on 3 rd June 2009
This example uses Apache’s mod_rewrite to convert a url like http://url/img.php?img=5 to http://url/5.
RewriteEngine On
RewriteRule ^([a-zA-Z0-9_-]+)$ img.php?img=$1
RewriteRule ^([a-zA-Z0-9_-]+)/$ img.php?img=$1
Posted at 1:29 on 4 th May 2009
In this example, the size of a given directory is output. Note: This will only work on Linux.
$f = "./files";
$io = popen ("/usr/bin/du -sk " . $f, "r");
$size = fgets ($io, 4096);
$value = substr($size, 0, -8);
pclose ($io);
echo $value;
The directory name is held in $f, the “-8” value would need to be changed to remove the correct number of characters, or replaced with another function which would calculate the length of $f. Not used here to keep it simple.
Posted at 12:16 on 4 th May 2009
This example provides a function which when passed a variable, will output the file of that variable. This makes the assumption that the file is located in “files/thenameofthefile.ext”.
function pushimage($file) {
$file = "files/" . $file;
if (file_exists($file)) {
header('Content-Type: image/jpeg');
header('Expires: 0');
header('Content-Length: ' . filesize($file));
ob_clean();
flush();
readfile($file);
exit;
}
}
Note: At the time of posting, this does not check to ensure the file extension being returned is correct.
Posted at 9:07 on 3 th May 2009
