php if $_GET equals a certain array - php

Question

I'm trying to use the break concept, but I am also am using some built in PHP functions to only allow certain values into the get function.
$allowedKeys = array(
'route'
);
$options = array(
'chapter_1' => 'chapter_1',
'chapter_2' => 'chapter_2',
'chapter_3' => 'chapter_3'
);
$_GET = array_intersect_key($_GET, array_flip($allowedKeys));
if($_GET[$allowedKeys[0]] && array_key_exists($_GET[$allowedKeys[0]], $options)) {
if($_GET[$allowedKeys[0]] == $options[0]) {
/* This is where I'm trying to see if route=chapter_1 then do something.
The logic I'm trying to write is if the route is chapter_1 then print
out the content from chapter 1 How can determine this? */
echo "Hello";
}
}
Why isn't this code echoing "hello"?

Answer 1

Why make it more complex than it needs to be?
//check you have a route
$route = isset( $_GET['route'] ) ? $_GET['route'] : '';
switch( $route ) {
case 'chapter_1':
//do chapter one stuff
echo 'Chapter 1';
break;
case 'chapter_2':
//do chapter two stuff
echo 'Chapter 2';
break;
default:
echo 'Intro';
}

Answer 2

I'll answer your question directly for you. 'Hello' isn't showing because it is inside an if statement that isn't being triggered because either "if($_GET[$allowedKeys[0]] && array_key_exists($_GET[$allowedKeys[0]], $options))" or "if($_GET[$allowedKeys[0]] == $options[0])" is returning false.