How to pass argument to wp_footer hook with data from a template

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I need to display a script just after all my js files loaded via wp_enqueue_script

In my functions.php :

function list_hotels($hotels){ ?>
    <script>
        var positions = [];
        positions = <?php echo json_encode($hotels); ?>
    </script>
    <?php
}
add_action('wp_footer', 'list_hotels', 50, 1);

In my template (there is an available $hotels var which is an array) :

do_action( 'wp_footer', $hotels );

What's wrong with my code?

I need to display a script just after all my js files loaded via wp_enqueue_script

In my functions.php :

function list_hotels($hotels){ ?>
    <script>
        var positions = [];
        positions = <?php echo json_encode($hotels); ?>
    </script>
    <?php
}
add_action('wp_footer', 'list_hotels', 50, 1);

In my template (there is an available $hotels var which is an array) :

do_action( 'wp_footer', $hotels );

What's wrong with my code?

• hooks

Share Improve this question asked May 7, 2018 at 10:07 William OdeWilliam Ode 12322 silver badges1111 bronze badges 3

• Try changing function list_hotels($hotels){ ?> to function list_hotels(){ global $hotels; ?> and you may also need to declare the $hotels as a global variable. E.g. global $hotels; $hotels = array( ... );. – Sally CJ Commented May 8, 2018 at 8:00
• 1 @SallyCJ I hope you are joking when suggesting that anyone should use globals ;) – Mark Kaplun Commented May 9, 2018 at 14:01
• Hehe.. but I'd actually provide a more appropriate answer if @WilliamOde replied... =) – Sally CJ Commented May 9, 2018 at 14:40

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2 Answers 2

Sorted by: Reset to default 3

The right way to pass extra parameters to hooks, in addition to the ones they declare is by using closures

in your case it will be something like

add_action( 'wp_footer', function () use ($hotels) { list_hotels($hotels) });

The use keyword enable sharing of variables between the context in which the closure is declared and the one it is being used (meaning, when the action is actually executed).

The best way of passing PHP variables to JavaScript is using wp_localize_script, which helps to localizes a registered script with data for a JavaScript variable.

Here is a solution in StackOverflow, from where you can get idea to fix your problem.

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