theme.php

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<?php
 
$vars = (array) get_input('vars', [], false);
 
$available_config = _elgg_services()->cssCompiler->getCssVars();
 
$default_scheme_vars = [];
if (isset($available_config['default'])) {
    $default_scheme_vars = array_map(function() {
        // empty function to clear the values
    }, $available_config['default']);
}
 
foreach ($vars as $color_scheme => $scheme_vars) {
    $allowed_keys = $color_scheme === 'default' ? $scheme_vars : array_merge($default_scheme_vars, $scheme_vars);
    
    foreach ($scheme_vars as $name => $value) {
        if (empty($value)) {
            unset($vars[$color_scheme][$name]);
            continue;
        }
        
        if (!array_key_exists($name, $allowed_keys)) {
            unset($vars[$color_scheme][$name]);
            continue;
        }
        
        if (strtolower($value) === strtolower((string) $available_config[$color_scheme][$name])) {
            unset($vars[$color_scheme][$name]);
            continue;
        }
    }
}
 
if (empty($vars)) {
    elgg_remove_config('custom_theme_vars');
} else {
    elgg_save_config('custom_theme_vars', $vars);
}
 
elgg_invalidate_caches();
 
return elgg_ok_response('', elgg_echo('save:success'));