> The question is how to perform intersection on the following structure:
>
> $products =
> array(array("green","red","blue"),array("green","yellow","red"),array("green","red","purple"),array("green","red","yellow"));
If I understood you correctly ..
<?php
$arr = array();
$arr[] = array("green", "red", "blue");
$arr[] = array("green", "yellow", "red");
$arr[] = array("green", "red", "purple");
$arr[] = array("green","red","yellow");
var_dump($arr);
// you could also ..
$arr = array();
array_push(
$arr, array("green", "red", "blue"),
array("green", "yellow", "red"),
array("green", "red", "purple"),
array("green","red","yellow")
);
var_dump($arr);
?>
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