create-icon-set-for-generatepress/functions.php

<?php

//directory where icons arent
$files = scandir(get_stylesheet_directory().'/icons2');

function store_svg_icons_to_json($files) {
    // init empty array      
    $json_svgs=[];
    // loop into files list
    foreach($files as $file) {
        // remove empty files
        if($file!='.' && $file!='..'){
            $name = str_replace('.svg','',$file);
            $icon = esc_html(file_get_contents(get_stylesheet_directory().'/icons2/'.$file));
            $icon = str_replace('http://www.w3.org/2000/svg">','',$icon);
            $jsons_svgs[] = [
                                'name'=>$name,
                                'icon'=>str_replace('http://www.w3.org/2000/svg">','',$icon)
                            ];
        }
    }
    return $jsons_svgs;
 }