An image resizer tool written in PHP.

resize.php

<?php

class Console
{
	public static function WriteLine($string)
	{
		echo $string . PHP_EOL;
	}

	public static function ReadLine()
	{
		return trim(fgets(STDIN));
	}
}

function FindImages($directory)
{
	$images = array();

	$files = scandir($directory);

	foreach ($files as $file)
	{
		if ($file == '.' || $file == '..')
		{
			continue;
		}

		$file = $directory . DIRECTORY_SEPARATOR . $file;

		if (!is_dir($file))
		{
			if (in_array(strtolower(pathinfo($file, PATHINFO_EXTENSION)), array('jpg', 'png', 'jpeg')))
			{
				$images[] = $file;
			}
		}
		else
		{
			$images = array_merge($images, FindImages($file));
		}
	}

	return $images;
}

if (count($argv) < 3)
{
	Console::WriteLine('Usage: resize.php $searchDirectory $destinationDirectory [-size=300x300]');
	die(1);
}

$searchDirectory = realpath($argv[1]);
$destinationDirectory = realpath(dirname($argv[2])) . DIRECTORY_SEPARATOR . basename($argv[2]);

if (!file_exists($searchDirectory))
{
	Console::WriteLine('Error: Search directory doesn\'t exist.');
	
	die(0);
}

if (file_exists($destinationDirectory))
{
	Console::WriteLine('Warning: Destination directory exists and files might be overwritten.');
	Console::WriteLine('Continue? (yes/no)');

	if (Console::ReadLine() == 'no')
	{
		die(0);
	}
}
else
{
	Console::WriteLine('Creating destination directory: ' . $destinationDirectory);
	mkdir($destinationDirectory);
}

$height = 300;
$width = 300;

foreach ($argv as $argument)
{
	if (substr_compare($argument, '-size=', 0, min(strlen($argument), 6), true) == 0)
	{
		$size = explode('x', substr($argument, strpos($argument, '=') + 1));

		if (count($size) != 2)
		{
			Console::WriteLine('Invalid format for argument: ' . $argument);

			die(1);
		}

		if (is_numeric($size[0]))
		{
			$width = intval($size[0]);
		}

		if (is_numeric($size[1]))
		{
			$height = intval($size[1]);
		}

		break;
	}
}

$images = FindImages($searchDirectory);

if (count($images) == 0)
{
	Console::WriteLine('No images found to resize. Exiting...');

	die(0);
}

foreach ($images as $image)
{
	Console::WriteLine('Processing file "' . $image . '"');

	$folders = dirname(str_replace($searchDirectory, '', $image));

	if (!file_exists($destinationDirectory . $folders))
	{
		mkdir($destinationDirectory . $folders, 0777, true);
	}

	if ($folders == DIRECTORY_SEPARATOR)
	{
		$folders = '';
	}

	$filename = basename($image);

	$destinationFile = $destinationDirectory . $folders . DIRECTORY_SEPARATOR . $filename;

	$destinationImage = imagecreatetruecolor($width, $height);

	$white = imagecolorallocate($destinationImage, 0xFF, 0xFF, 0xFF);

	imagefill($destinationImage, 0, 0, $white);

	switch(strtolower(pathinfo($image, PATHINFO_EXTENSION)))
	{
		case 'jpg':
		case 'jpeg':
			$sourceImage = imagecreatefromjpeg($image);
		break;

		case 'png':
			$sourceImage = imagecreatefrompng($image);
		break;

		default:
			Console::WriteLine('Unrecognized file-extension.');
			continue 2;
		break;
	}

	$imageWidth = imagesx($sourceImage);
	$imageHeight = imagesy($sourceImage);

	if ($imageWidth > $imageHeight)
	{
		$ratio = $imageHeight / $imageWidth;
		$sourceWidth = $width;
		$sourceHeight = $width * $ratio;
		$y = floor(($height - $sourceHeight) / 2);
		$x = 0;
	}
	else if ($imageWidth < $imageHeight)
	{
		$ratio = $imageWidth / $imageHeight;
		$sourceHeight = $height;
		$sourceWidth = $height * $ratio;
		$x = floor(($width - $sourceWidth) / 2);
		$y = 0;
	}
	else
	{
		$ratio = 1;
		$sourceHeight = $height;
		$sourceWidth = $width;
		$x = 0;
		$y = 0;
	}

	imagecopyresampled($destinationImage, $sourceImage, $x, $y, 0, 0, $sourceWidth, $sourceHeight, $imageWidth, $imageHeight);

	switch(strtolower(pathinfo($image, PATHINFO_EXTENSION)))
	{
		case 'jpg':
		case 'jpeg':
			imagejpeg($destinationImage, $destinationFile, 90);
		break;

		case 'png':
			imagepng($destinationImage, $destinationFile, 8);
		break;

		default:
			Console::WriteLine('Unrecognized file-extension.');
		break;
	}

	imagedestroy($sourceImage);
	imagedestroy($destinationImage);
}