Question

It may just be that I’ve checked out already for the weekend, but having a bit of trouble updating an associative array based on a certain value. For example, here is what I have so far:

$slideshow_vars = array(
        'js_animation'          => $slideshow_options['js_animation'],
        'js_slide_direction'    => $slideshow_options['js_slide_direction'],
        'js_slideshow'          => $slideshow_options['js_slideshow'],
        'js_slideshow_speed'    => $slideshow_options['js_slideshow_speed'],
        'js_animation_duration' => $slideshow_options['js_animation_duration'],
        'js_direction_nav'      => $slideshow_options['js_direction_nav'],
        'js_control_nav'        => $slideshow_options['js_control_nav'],
        'js_keyboard_nav'       => $slideshow_options['js_keyboard_nav'],
        'js_mousewheel'         => $slideshow_options['js_mousewheel'],
        'js_prev_text'          => $slideshow_options['js_prev_text'],
        'js_next_text'          => $slideshow_options['js_next_text'],
        'js_pause_play'         => $slideshow_options['js_pause_play'],
        'js_pause_text'         => $slideshow_options['js_pause_text'],
        'js_play_text'          => $slideshow_options['js_play_text'],
        'js_randomize'          => $slideshow_options['js_randomize'],
        'js_slide_start'        => $slideshow_options['js_slide_start'],
        'js_animation_loop'     => $slideshow_options['js_animation_loop'],
        'js_pause_on_action'    => $slideshow_options['js_pause_on_action'],
        'js_pause_on_hover'     => $slideshow_options['js_pause_on_hover'],
        'js_controls_container' => $slideshow_options['js_controls_container'],
        'js_manual_controls'    => $slideshow_options['js_manual_controls'],
        'js_start_function'     => $slideshow_options['js_start_function'],
        'js_before_function'    => $slideshow_options['js_before_function'],
        'js_after_function'     => $slideshow_options['js_after_function'],
        'js_end_function'       => $slideshow_options['js_end_function']
    );
foreach ($slideshow_vars as $key => $value) {
    if($value == NULL) {
        $value = "false";
    }
}
print_r($slideshow_vars);

In a number of the values in the array, they are outputting NULL — well, I need to change those to a string of false (this data is being localized and then sent to a JS file which expects false). When I perform the above print_r() it hasn’t actually updated anything.

Answer 1

That is because foreach normally passes array fields by value.
What you need to do is this:

foreach ($slideshow_vars as $key => &$value) {
    if($value == NULL) {
        $value = "false";
    }
}