Year: 2010

PHP

Power of PHP: Resizing Images on Command Line

Post author By masnun
Post date April 3, 2010
2 Comments on Power of PHP: Resizing Images on Command Line

I’m too busy to explain the script now. In short, it scans the current directory for all the JPG images and converts them into smaller image files hardly compromising the quality. I managed to convert a 211 MB album into a 5.8 MB collection with this script. Modify the $dir varible which holds the location of target directory. Make sure the target directory already exists. Also change the $percent inside the resize function to control the output quality.

Thanks to PHP for such powerful image processing. I just ran the following command on my Ubuntu terminal:

cd /var/www/photos
php img.php

1 2	cd /var/www/photos php img.php

I was done! Here’s the source code:

<?php
$dir = "/home/masnun/Desktop/photos/";

$files = glob("*.JPG");
echo count($files). " to process \n";
foreach( $files as $file ) {
        echo "Processing: {$file} ....";
        resize($file, $dir);
        echo " -- done \n";

        }

function resize($img, $dir) {
$new_loc = $dir.basename($img);
$percent = 30;
$constrain = "";
$w = "" ;
$h = "";

// get image size of img
$x = @getimagesize($img);
// image width
$sw = $x[0];
// image height
$sh = $x[1];

if ($percent > 0) {
	// calculate resized height and width if percent is defined
	$percent = $percent * 0.01;
	$w = $sw * $percent;
	$h = $sh * $percent;
} else {
	if (isset ($w) AND !isset ($h)) {
		// autocompute height if only width is set
		$h = (100 / ($sw / $w)) * .01;
		$h = @round ($sh * $h);
	} elseif (isset ($h) AND !isset ($w)) {
		// autocompute width if only height is set
		$w = (100 / ($sh / $h)) * .01;
		$w = @round ($sw * $w);
	} elseif (isset ($h) AND isset ($w) AND isset ($constrain)) {
		// get the smaller resulting image dimension if both height
		// and width are set and $constrain is also set
		$hx = (100 / ($sw / $w)) * .01;
		$hx = @round ($sh * $hx);

		$wx = (100 / ($sh / $h)) * .01;
		$wx = @round ($sw * $wx);

		if ($hx < $h) {
			$h = (100 / ($sw / $w)) * .01;
			$h = @round ($sh * $h);
		} else {
			$w = (100 / ($sh / $h)) * .01;
			$w = @round ($sw * $w);
		}
	}
}

$im = @ImageCreateFromJPEG ($img) or // Read JPEG Image
$im = @ImageCreateFromPNG ($img) or // or PNG Image
$im = @ImageCreateFromGIF ($img) or // or GIF Image
$im = false; // If image is not JPEG, PNG, or GIF

if (!$im) {
	// We get errors from PHP's ImageCreate functions...
	// So let's echo back the contents of the actual image.
	readfile ($img);
} else {
	// Create the resized image destination
	$thumb = @ImageCreateTrueColor ($w, $h);
	// Copy from image source, resize it, and paste to image destination
	@ImageCopyResampled ($thumb, $im, 0, 0, 0, 0, $w, $h, $sw, $sh);
	// Output resized image
	@ImageJPEG ($thumb, $new_loc);
}
}
?>

<?php

$dir = "/home/masnun/Desktop/photos/";

$files = glob("*.JPG");

echo count($files). " to process \n";

foreach( $files as $file ) {

echo "Processing: {$file} ....";

resize($file, $dir);

echo " -- done \n";

}

function resize($img, $dir) {

$new_loc = $dir.basename($img);

$percent = 30;

$constrain = "";

$w = "" ;

$h = "";

// get image size of img

$x = @getimagesize($img);

// image width

$sw = $x[0];

// image height

$sh = $x[1];

if ($percent > 0) {

// calculate resized height and width if percent is defined

$percent = $percent * 0.01;

$w = $sw * $percent;

$h = $sh * $percent;

} else {

if (isset ($w) AND !isset ($h)) {

// autocompute height if only width is set

$h = (100 / ($sw / $w)) * .01;

$h = @round ($sh * $h);

} elseif (isset ($h) AND !isset ($w)) {

// autocompute width if only height is set

$w = (100 / ($sh / $h)) * .01;

$w = @round ($sw * $w);

} elseif (isset ($h) AND isset ($w) AND isset ($constrain)) {

// get the smaller resulting image dimension if both height

// and width are set and $constrain is also set

$hx = (100 / ($sw / $w)) * .01;

$hx = @round ($sh * $hx);

$wx = (100 / ($sh / $h)) * .01;

$wx = @round ($sw * $wx);

if ($hx < $h) {

$h = (100 / ($sw / $w)) * .01;

$h = @round ($sh * $h);

} else {

$w = (100 / ($sh / $h)) * .01;

$w = @round ($sw * $w);

}

$im = @ImageCreateFromJPEG ($img) or // Read JPEG Image

$im = @ImageCreateFromPNG ($img) or // or PNG Image

$im = @ImageCreateFromGIF ($img) or // or GIF Image

$im = false; // If image is not JPEG, PNG, or GIF

if (!$im) {

// We get errors from PHP's ImageCreate functions...

// So let's echo back the contents of the actual image.

readfile ($img);

} else {

// Create the resized image destination

$thumb = @ImageCreateTrueColor ($w, $h);

// Copy from image source, resize it, and paste to image destination

@ImageCopyResampled ($thumb, $im, 0, 0, 0, 0, $w, $h, $sw, $sh);

// Output resized image

@ImageJPEG ($thumb, $new_loc);

}

Python

Building A Proxy Scraper with 15 lines of Python

Post author By masnun
Post date March 18, 2010
2 Comments on Building A Proxy Scraper with 15 lines of Python

Yes, Python is great! It’s beautiful and so on…. I have described the power of Python many times. For now, just the codes 🙂 Here’s a proxy scraper I built a few moments ago. It scrapes the web page at proxy-hunter.blogspot.com and lists the available open proxies.

#!/usr/bin/env python

from BeautifulSoup import BeautifulSoup as Soup
import re, urllib

url = 'http://proxy-hunter.blogspot.com/2010/03/18-03-10-speed-l1-hunter-proxies-310.html'
document = urllib.urlopen(url)
tree = Soup(document.read())
regex  = re.compile(r'^(\d{3}).(\d{1,3}).(\d{1,3}).(\d{1,3}):(\d{2,4})')
proxylist = tree.findAll(attrs = {"class":"Apple-style-span", "style": "color: black;"}, text = regex)
data = proxylist[0]
for x in data.split('\n'):
        print x

#!/usr/bin/env python

from BeautifulSoup import BeautifulSoup as Soup

import re, urllib

url = 'http://proxy-hunter.blogspot.com/2010/03/18-03-10-speed-l1-hunter-proxies-310.html'

document = urllib.urlopen(url)

tree = Soup(document.read())

regex = re.compile(r'^(\d{3}).(\d{1,3}).(\d{1,3}).(\d{1,3}):(\d{2,4})')

proxylist = tree.findAll(attrs = {"class":"Apple-style-span", "style": "color: black;"}, text = regex)

data = proxylist[0]

for x in data.split('\n'):

print x

It uses the BeautifulSoup package for parsing HTML. On ubuntu install it with this command:

sudo apt-get install python-beautifulsoup

1	sudo apt-get install python-beautifulsoup

On other platforms, grab the package from its homepage. Google is there to find the URL for you 😉

Python

Using Python on Hostmonster, Umbrahosting And Other General Shared Hosting

Post author By masnun
Post date March 11, 2010
1 Comment on Using Python on Hostmonster, Umbrahosting And Other General Shared Hosting

I’ve a hostmonster and umbrahosting shared hosting where my sites are running smoothly in PHP. I’m perfectly happy with both UmbraHosting and HostMonster. Additionally both the hosting providers have Python support. Being a Python enthusiast, I decided to check out.

On both Hostmonster and Umbrahosting, you can execute Python scripts as CGI scripts. But you must take care of these points:

— They must be placed inside the cgi-bin directory.
— Permission should be 755. (777 triggered server error for me)

I didn’t find the latest version of Python anywhere on these two hosts. Let alone Python 2.5, they have Python 2.4. 🙁 But still I’m happy that I can run Python. The only thing that I didn’t like was the obligation to put my scripts in the cgi-bin directory. So, I couldn’t have URLs like https://masnun.com/hello.py 🙁

Later today afternoon, an idea clicke in my mind. Can’t I target a subdomain to the cgi-bin directory? The answer is: YES! Just use a .htaccess file to map certain urls to your cgi-bin directory.

<ifModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule (.*) cgi-bin/$1 [L]
</ifModule>

RewriteEngine On

RewriteCond %{REQUEST_FILENAME} !-f

RewriteCond %{REQUEST_FILENAME} !-d

RewriteRule (.*) cgi-bin/$1 [L]

</ifModule>

Putting the .htaccess in your domain’s root directory will allow you to put a python file inside your cgi-bin directory and visit it from http://example.com/example.py 😀

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