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I use a function in my theme that prevents upload of big size image files (thanks to @fischi), but I want to apply it strictly to .jpg/.jpeg files only, because it prevents to upload .pdf files too. How to adapt this function?

I use a function in my theme that prevents upload of big size image files (thanks to @fischi), but I want to apply it strictly to .jpg/.jpeg files only, because it prevents to upload .pdf files too. How to adapt this function?

add_filter('wp_handle_upload_prefilter', 'f711_image_size_prevent');
function f711_image_size_prevent($file) {

    // get imagetype of upload
    $type = $file['type'];
    $is_image = strpos($type, 'image');

    // set allowed imagetype
    $imagetype = 'image/jpeg';

    if ( $type == $imagetype ) {

        // get filesize of upload
        $size = $file['size'];
        $size = $size / 1024; // Calculate down to KB

        // set sizelimit
        $limit = 700; // Your Filesize in KB

        // set imagelimit
        $imagelimit = 7;

        // query how many images the current user already uploaded
        global $current_user;
        $args = array(
                'orderby'         => 'post_date',
                'order'           => 'DESC',
                'numberposts'     => -1,
                'post_type'       => 'attachment',
                'author'          => $current_user->ID,
        );
        $attachmentsbyuser = get_posts( $args );

        if ( ( $size > $limit ) && ($is_image !== false) ) { // check if the image is small enough
            $file['error'] = 'Image files must be smaller than '.$limit.'KB';
        } elseif ( count( $attachmentsbyuser ) >= $imagelimit ) { // check if the user has exceeded the image limit
            $file['error'] = 'Image limit of ' . $imagelimit . ' is exceeded for this user.';
        }
        return $file;
    } else { return $file; }
 
}

add_filter('wp_handle_upload_prefilter', 'f711_image_size_prevent');
function f711_image_size_prevent($file) {

    // get imagetype of upload
    $type = $file['type'];
    $is_image = strpos($type, 'image');

    // set allowed imagetype
    $imagetype = 'image/jpeg';

    if ( $type == $imagetype ) {

        // get filesize of upload
        $size = $file['size'];
        $size = $size / 1024; // Calculate down to KB

        // set sizelimit
        $limit = 700; // Your Filesize in KB

        // set imagelimit
        $imagelimit = 7;

        // query how many images the current user already uploaded
        global $current_user;
        $args = array(
            'orderby'         => 'post_date',
            'order'           => 'DESC',
            'numberposts'     => -1,
            'post_type'       => 'attachment',
            'author'          => $current_user->ID,
        );
        $attachmentsbyuser = get_posts( $args );

        if ( ( $size > $limit ) && ($is_image !== false) ) { // check if the image is small enough
            $file['error'] = 'Image files must be smaller than '.$limit.'KB';
        } elseif ( count( $attachmentsbyuser ) >= $imagelimit ) { // check if the user has exceeded the image limit
            $file['error'] = 'Image limit of ' . $imagelimit . ' is exceeded for this user.';
        }
        return $file;
    } else { return $file; }
}

I use a function in my theme to reduce .jpg/.jpeg files size when upload (thanks to @fischi), but I want to apply it strictly to .jpg/.jpeg files only, because it tries to reduce .pdf files too. How to adapt this function?

add_filter('wp_handle_upload_prefilter', 'f711_image_size_prevent');
function f711_image_size_prevent($file) {

    // get filesize of upload
    $size = $file['size'];
    $size = $size / 1024; // Calculate down to KB

    // get imagetype of upload
    $type = $file['type'];
    $is_image = strpos($type, 'image');

    // set sizelimit
    $limit = 700; // Your Filesize in KB

    // set imagelimit
    $imagelimit = 7;

    // set allowed imagetype
    $imagetype = 'image/jpeg';

    // query how many images the current user already uploaded
    global $current_user;
    $args = array(
        'orderby'         => 'post_date',
        'order'           => 'DESC',
        'numberposts'     => -1,
        'post_type'       => 'attachment',
        'author'          => $current_user->ID,
    );
    $attachmentsbyuser = get_posts( $args );

    if ( ( $size > $limit ) && ($is_image !== false) ) { // check if the image is small enough
        $file['error'] = 'Image files must be smaller than '.$limit.'KB';
    } elseif ( $type != $imagetype ) { // check if image type is allowed
        $file['error'] = 'Image must be ' . $imagetype . '.';
    } elseif ( count( $attachmentsbyuser ) >= $imagelimit ) { // check if the user has exceeded the image limit
        $file['error'] = 'Image limit of ' . $imagelimit . ' is exceeded for this user.';
    }
    return $file;

}

I use a function in my theme that prevents upload of big size image files (thanks to @fischi), but I want to apply it strictly to .jpg/.jpeg files only, because it prevents to upload .pdf files too. How to adapt this function?

add_filter('wp_handle_upload_prefilter', 'f711_image_size_prevent');
function f711_image_size_prevent($file) {

    // get filesize of upload
    $size = $file['size'];
    $size = $size / 1024; // Calculate down to KB

    // get imagetype of upload
    $type = $file['type'];
    $is_image = strpos($type, 'image');

    // set sizelimit
    $limit = 700; // Your Filesize in KB

    // set imagelimit
    $imagelimit = 7;

    // set allowed imagetype
    $imagetype = 'image/jpeg';

    // query how many images the current user already uploaded
    global $current_user;
    $args = array(
        'orderby'         => 'post_date',
        'order'           => 'DESC',
        'numberposts'     => -1,
        'post_type'       => 'attachment',
        'author'          => $current_user->ID,
    );
    $attachmentsbyuser = get_posts( $args );

    if ( ( $size > $limit ) && ($is_image !== false) ) { // check if the image is small enough
        $file['error'] = 'Image files must be smaller than '.$limit.'KB';
    } elseif ( $type != $imagetype ) { // check if image type is allowed
        $file['error'] = 'Image must be ' . $imagetype . '.';
    } elseif ( count( $attachmentsbyuser ) >= $imagelimit ) { // check if the user has exceeded the image limit
        $file['error'] = 'Image limit of ' . $imagelimit . ' is exceeded for this user.';
    }
    return $file;

}

UPDATE

This is the improved code (not tested yet), thanks to @nikhil-sheth:

add_filter('wp_handle_upload_prefilter', 'f711_image_size_prevent');
function f711_image_size_prevent($file) {

    // get imagetype of upload
    $type = $file['type'];
    $is_image = strpos($type, 'image');

    // set allowed imagetype
    $imagetype = 'image/jpeg';

    if ( $type == $imagetype ) {

        // get filesize of upload
        $size = $file['size'];
        $size = $size / 1024; // Calculate down to KB

        // set sizelimit
        $limit = 700; // Your Filesize in KB

        // set imagelimit
        $imagelimit = 7;

        // query how many images the current user already uploaded
        global $current_user;
        $args = array(
                'orderby'         => 'post_date',
                'order'           => 'DESC',
                'numberposts'     => -1,
                'post_type'       => 'attachment',
                'author'          => $current_user->ID,
        );
        $attachmentsbyuser = get_posts( $args );

        if ( ( $size > $limit ) && ($is_image !== false) ) { // check if the image is small enough
            $file['error'] = 'Image files must be smaller than '.$limit.'KB';
        } elseif ( count( $attachmentsbyuser ) >= $imagelimit ) { // check if the user has exceeded the image limit
            $file['error'] = 'Image limit of ' . $imagelimit . ' is exceeded for this user.';
        }
        return $file;
    } else { return $file; }

}