Month: May 2007

[problem]

You have a requirement to capture network speed, in microseconds.

The required speed was less than 0.25 of a second (or quarter of second).

[/problem]

[solution]

We use PHP to capture the current time in microseconds. Run a system ping command. Capture the new time and minus one from the other.

[/solution]

[example]

Here’s the PHP code, using the microtime function and a simple ping.

<?php

list($usec, $sec)=
explode(" ",microtime());

$thisDate=sprintf("%f", ($usec+$sec));

$host="$argv[1]";

system("ping -c1 $host > /dev/null 2>&1",$response);

if($response==0) {

list($usec, $sec)=explode(" ",microtime());

$nextDate=sprintf("%f", ($usec+$sec));

printf("%0.4fn",$nextDate-$thisDate);

} else {

print("ping failed to host: $hostn");

}

?>

Here is a run through:

$ php -q pingHost.php bagend
0.0098
$ php -q pingHost.php bagend
0.0066
$ php -q pingHost.php bagend
0.0065
$ php -q pingHost.php bagend
0.0066

[/example]

[reference]

[tags]UNIX, Network testing, ping, PHP, microtime, PHP Coding School[/tags]

• PHP Docs list Function
• PHP Docs sprintf Function
• PHP Docs print Function
• PHP Docs system Function
• PHP Docs explode Function
• PHP Docs microtime Function

[/reference]

[problem]

you want to run queries against a Sybase Database, using the PHP API.

[/problem]

[solution]

A PHP script using sybase API for PHP, connect as given user, with your password on specific host.

[/solution]

[example]

Useful for monitoring sybase dbs, although in this instance it does not actually hit any database tables.

<?php

$user = "your_user";
$passwd = "password";
$host = "your_host";
$sql="select getdate(), @@version ";
$conn=sybase_connect($host,$user,$pass); // connect to db
print("running query host: $hostnuser: $usern");
$result = sybase_query ( $sql ); // Run query and store in array
$i = 0;
while($row = sybase_fetch_array($result)) {
// Loop around the array and print field or column 1 and 2
$i++;
$item1 = $row[0];
$item2 = $row[1];
echo "$i $item1 $item2";
}
sybase_close();
?>


[/example]

[reference]

[tags]Sybase PHP example, PHP Coding School[/tags]

• PHP Docs – sybase functions

[/reference]

[problem]

You want to generate an image, with text over the top.

[/problem]

[solution]

Why of course we use PHP extensive image library routines! 🙂

[/solution]

[example]

<?php

header(“Content-type: image/png”);
$string = $_GET[‘label’];

if(isset($_GET[‘font’])) { $font = $_GET[‘font’]; } else { $font=“2″; }
$len=strlen($string);
$text_width = imagefontwidth($font);
$text_height = imagefontwidth($font);
/* Create a blank image */
$im = imagecreate (($len*$text_width)+10, $text_height+10);
$bgc = imagecolorallocate ($im, 0, 0, 0);
$tc = imagecolorallocate ($im, 255, 255, 255);
imagefilledrectangle ($im, 0, 0, 150, 30, $bgc);
imagestring ($im, $font, 5, 0, “$string”, $tc);
imagepng($im);
imagedestroy($im);

?>

[/example]

[reference]

I’ve now created an online tool, using this code Label Your Images

[tags]Image Creation, Label Image, PHP Coding School[/tags]

• PHP Docs – image functions
• PHP Docs – strlen function
• PHP Docs – header function

[/reference]

[problem]

You want to transform text form ascii to base64, urlencode it, digest it, etc.

Or you want to decode these formats.

[/problem]

[solution]

Just wrote this tool, to allow instant transformation of data into following formats:

base64 encode decode, urlencode decode, md5 and sha1 hashing, addslashes and htmlentities

click here to access the transform tool
Pretty cool to see ‘all’ too – check it out.

[/solution]

[example]

Here is the code:


<?php

if(isset($_GET['mode'])) {

$mode=urlencode($_GET['mode']);

$val=$_GET['val'];

switch($mode) {

case "base64_encode": echo base64_encode($val); break;
case "base64_decode": echo base64_decode($val); break;
case "urldecode": echo urldecode($val); break;
case "urlencode": echo urlencode($val); break;
case "htmlentities": echo htmlentities($val); break;
case "rot13": echo str_rot13($val);break;
case "md5": echo md5($val);break;
case "sha1": echo sha1($val);break;
case "all":

echo "base64_encode: ".base64_encode($val);
echo "base64_decode: ".base64_decode($val);
echo "urldecode: ".urldecode($val);
echo "urlencode: ".urlencode($val);
echo "htmlentities: ".htmlentities($val);
echo "addslashes: ".addslashes($val);
echo "rot13: ".str_rot13($val);
echo "md5: ".md5($val);
echo "sha1: ".sha1($val);
break;

}

exit(0);

}

?>


[/example]

[reference]

[tags]AJAX Tool, PHP AJAX, PHP Coding School[/tags]

• PHP Docs – base64_encode function
• PHP Docs – base64_decode function
• PHP Docs – urlencode function
• PHP Docs – urldecode function
• PHP Docs – htmlentities function
• PHP Docs – addslashes function
• PHP Docs – str_rot13 function
• PHP Docs – md5 function
• PHP Docs – sha1 function

[/reference]

[problem]

You need to make a thumbnail of an image, on the fly.

[/problem]

[solution]

Here is a short PHP script to make a thumbnail out of the image.

It takes two arguments, one for the image’s file name and one for the compression rate.

[/solution]

[example]

displayThumb.php
<?php

$filename = $_GET['filename'];
$compression = $_GET['compression'];

Header("Content-type: image/png");

$im = imagecreatefrompng("$filename");

$currWidth=ImageSX($im);
$currHeight=ImageSY($im);

$newWidth=$currWidth * ($compression / 100);
$newHeight=$currHeight * ($compression / 100);

$im1 = imagecreatetruecolor($newWidth,$newHeight);
$bgc = imagecolorallocate ($im1,255,255,255);
imagefilledrectangle ($im1, 0, 0, $newWidth, $newHeight, $bgc);
imagecopyresampled ($im1, $im, 0, 0, 0, 0,
$newWidth, $newHeight, $currWidth, $currHeight);
imagepng($im1);
imagedestroy($im1);

?>

[/example]

[reference]

[tags]Image manipulation, thumbnail creation on the fly, PHP Coding School[/tags]

[/reference]

[problem]

You need to convert a GIF into a PNG.

[/problem]

[solution]

Another short bit of PHP, which takes a GIF filename as a parameter and a compression tag,
so you can convert to PNG and change size too.

If you don’t want to compress the image, just use a value of 100.

[/solution]

[example]

convertGifPng.php

<?php

$filename = $argv[1];
$compression = $argv[2];

Header("Content-type: image/png");

$im = imagecreatefromgif("$filename");

$currWidth=ImageSX($im);
$currHeight=ImageSY($im);

$newWidth=$currWidth * ($compression / 100);
$newHeight=$currHeight * ($compression / 100);

$im1 = imagecreatetruecolor($newWidth,$newHeight);
$bgc = imagecolorallocate ($im1,255,255,255);
imagefilledrectangle ($im1, 0, 0, $newWidth, $newHeight, $bgc);
imagecopyresampled ($im1, $im, 0, 0, 0, 0,
$newWidth, $newHeight, $currWidth, $currHeight);
imagepng($im1);
imagedestroy($im1);

?>

[/example]

[reference]

[tags]Convert Images GIF PNG, PHP Coding School[/tags]

[/reference]