Question

How do I detect if a certan sequence of elements is present in an array? E.g. if I have the arrays and needle

$needle = array(1,1);
$haystack1 = array(0,1,0,0,0,1,1,0,1,0);
$haystack2 = array(0,0,0,0,1,0,1,0,0,1);

How does one detect if the subset $needle is present in e.g. $haystack1? This method should return TRUE for $haystack1 and FALSE for $haystack2.

Thanks for any suggestions!

Answer 1

Join the arrays, and check for the strpos of the needle.

if ( strpos( join($haystack1), join($needle) ) >= 0 ) {
    echo "Items found";
}

Demo: http://codepad.org/F13DLWOI

Warning

This will not work for complicated items like objects or arrays within the haystack array. This method is best used with itesm like numbers and strings.