Filter 2d array by a flat, blacklist array

Question

I have an array that looks like this..

$breadcrumbs = [
    ['Home', 'homepage.html'],
    ['About', 'aboutpage.html'],
    ['Contact', 'contactpage.html']
];

$remove = ['Home'];

I am trying to use array_diff() to remove the Home entry from $breadcrumbs like this:

return ( array_diff($breadcrumbs, $remove) );

It is not working and giving me "Array to string conversion" errors, where am I going wrong?

Answer 1

Using a bit of array gymnastics, you can convert the breadcrumbs array into an associative array, keyed by the first item, then use array_diff_keys() with the $remove array flipped (convert the values to keys).

$breadcrumbs = array_column($breadcrumbs, null, 0);
$breadcrumbs = array_diff_key($breadcrumbs, array_flip($remove));
print_r($breadcrumbs);

If you want the end array to be a 0 based array without string keys, add

$breadcrumbs = array_values($breadcrumbs);