public function get_precompiled_css_content() {
        $configs = [$this] + $this->parent_configs;
        $css = '';

        foreach ($configs as $config) {
            if (isset($config->precompiledcsscallback)) {
                $function = $config->precompiledcsscallback;
                if (function_exists($function)) {
                    $css .= $function($this);
                }
            }
        }
        return $css;
    }
public function get_precompiled_css_content() {
        $configs = [$this] + $this->parent_configs;
        $css = '';

        foreach ($configs as $config) {
            if (isset($config->precompiledcsscallback)) {
                $function = $config->precompiledcsscallback;
                if (function_exists($function)) {
                    $css .= $function($this);
                }
            }
        }
        return $css;
    }
public function get_precompiled_css_content ( ) { $ configs = [ $ this ] + $ this -> parent_configs ; $ css = '' ; foreach ( $ configs as $ config ) { if ( isset ( $ config -> precompiledcsscallback ) ) { $ function = $ config -> precompiledcsscallback ; if ( function_exists ( $ function ) ) { $ css .= $ function ( $ this ) ; } } } return $ css ; }
Return the precompiled CSS if the precompiledcsscallback exists.

@return string Return compiled css.
Return the precompiled CSS if the precompiledcsscallback exists .