src/Neutrino/View/Engines/Volt/Compiler/Extensions/StrExtension.php
public function compileFunction($name, $arguments, $funcArguments)
    {
        if (!Str::startsWith($name, 'str_') || function_exists($name)) {
            return null;
        }

        $name = substr($name, 4);

        if (method_exists(Str::class, $name) && Reflexion::getReflectionMethod(Str::class, $name)->isPublic()) {
            return Str::class . '::' . $name . '(' . $arguments . ')';
        }

        return null;
    }
public function compileFunction($name, $arguments, $funcArguments)
    {
        if (!Str::startsWith($name, 'str_') || function_exists($name)) {
            return null;
        }

        $name = substr($name, 4);

        if (method_exists(Str::class, $name) && Reflexion::getReflectionMethod(Str::class, $name)->isPublic()) {
            return Str::class . '::' . $name . '(' . $arguments . ')';
        }

        return null;
    }
This method is called on any attempt to compile a function call

@param $name
@param $arguments

@return null|string