ImageMagickCommandLineProcessor for processing uploaded image files

ImageMagickCommandLineProcessor.php

<?php
/**
 * ImagickProcessor
 *
 * @author Frank Liepert <contact@frank-liepert.de>
 */
class ImageMagickCommandLineProcessor
{
    /** @type string $error */
    protected $error;

    /** @type string $resize */
    protected $resize;

    /**
     * @api
     *
     * @param string $resize
     *
     * @return $this Provides a fluent interface.
     */
    public function setResize($resize)
    {
        $this->resize = trim($resize);
        return $this;
    }

    /**
     * @api
     *
     * @param string $src
     * @param string $dest
     *
     * @return string|false
     */
    public function process($src, $dest)
    {
        $src = realpath($src);
        
        if ($src === false) {
            return false;
        }
        
        $command = $this->createCommand(array('identify', $src));
        exec($command, $output, $returnVar);

        if ($returnVar !== 0) {
            $this->error = 'IDENTIFY_ERROR';
            return false;
        }

        $command = $this->createCommand(array('convert', $src, $this->resize, $dest));
        exec($command, $output, $returnVar);

        if ($returnVar !== 0) {
            $this->error = 'CONVERT_ERROR';
            return false;
        }

        return $dest;
    }

    /**
     * @api
     *
     * @return string
     */
    public function getError()
    {
        return $this->error;
    }

    /**
     * @internal
     *
     * @param array $commands
     *
     * @return string
     */
    protected function createCommand(array $commands)
    {
        return implode(' ', array_filter($commands));
    }
}