WordPress MU Plugin: Strip EXIF data from images

remove-exif.php

<?php

/**
 *  Remove EXIF data from .jpg when uploaded.
 */

use Imagick;

/**
 * Strip EXIF using Imagick, fallback to gd
 *
 * @param array $upload
 * @return array
 */
add_action('wp_handle_upload', function ($upload) {
    if (! is_array($upload)) {
        return $upload;
    }

    if ($upload['type'] !== 'image/jpeg' && $upload['type'] !== 'image/jpg') {
        return $upload;
    }

    $filename = $upload['file'];

    // Attempt Imagick first; fallback to gd
    if (class_exists('Imagick')) {
        $im = new Imagick($filename);

        if (! $im->valid()) {
            return $upload;
        }

        try {
            $im->stripImage();
            $im->writeImage($filename);
            $im->clear();
            $im->destroy();
        } catch (\Exception $e) {
            error_log('Unable to strip EXIF data: ' . $filename);
        }
    } elseif (function_exists('imagecreatefromjpeg')) {
        $image = imagecreatefromjpeg($filename);

        if ($image) {
            imagejpeg($image, $filename, '100');
            imagedestroy($image);
        }
    }

    return $upload;
});

What dependency is Imagick used ?

@bdenie I generally prefer Imagick to GD as it tends to create higher-quality images. YMMV though.

reference: https://support.pagely.com/hc/en-us/articles/115000052451-Imagick-vs-GD-in-WordPress