Pass query string to page

Question

I wrote this function in my functions.php

function header_resized_img ($path, $width, $height) {
    $image = wp_get_image_editor($path);
    if (!is_wp_error($image)) {
        $image->resize(9999, $height, false);
        $orig_size = $image->get_size();
        $image->crop($orig_size['width']/2-$width/2, $orig_size['height']/2-$height/2, $width, $height);
        $image->stream( $mime_type = 'image/jpeg');
    }
}

To make it work, i created a file named page-image.php, then a page with permalink http://www.example.com/image/. Inside page-image.php i've put (just a test)

header_resized_img (get_header_image(), 414, 700);

which, in facts, does output the resized/cropped image when i visit it. Now i want to make it more flexible and pass parameters through URL. I tried query strings using $_GET, then i found get_query_arg, but none of these seems to do the trick. How could i do this? Thank you.

Answer 1

This should actually work for you:

function header_resized_img () {
    $image = wp_get_image_editor($_GET['path']);
    $height = $_GET['height'];
    $width =  $_GET['width'];
    if (!is_wp_error($image)) {
        $image->resize(9999, $height, false);
        $orig_size = $image->get_size();
        $image->crop($orig_size['width']/2-$width/2, $orig_size['height']/2-$height/2, $width, $height);
        $image->stream( $mime_type = 'image/jpeg');
    }
}

and include your function somewhere in the template:

header_resized_img();

Then try accessing this URL:

http://example.com/image/?width=500&height=400&path=some-url

To generate your image.