Novice! PHP about two arrays comparison!

There are now two arrays:

A array is a product attribute obtained from the product ID to the database.

b array is the product attribute submitted by the page.

Two array contrast, with a array as the benchmark, if the B array is less than an array of elements, then delete this element in the database association id!

If the B array has one more element than the a array, add the element and the correlation ID inside the database

Ask the Great God!!!

Reply to discussion (solution)

b more items than a Array_diff (b, a)
A more than B Array_diff (A, B)

An array of B is less than an array of elements $a=array (' A1 ', ' A2 ', ' A3 ', ' A4 '), $b =array (' A1 ', ' A2 ', ' A3 '); $new =array_merge (Array_diff ($a, Array_ Intersect ($a, $b)), Array_diff ($b, Array_intersect ($a, $b))); echo "
";p Rint_r ($new); echo"
/*array (    [0] = A4) *///b array has an element more than a array of $a=array (' A1 ', ' A2 ', ' A3 '), $b =array (' A1 ', ' A2 ', ' A3 ', ' B1 ', ' B2 '); $new = Array_merge (Array_diff ($a, array_intersect ($a, $b)), Array_diff ($b, Array_intersect ($a, $b))); echo "
";p Rint_r ($new); echo"
";/*array (    [0] = B1    [1] = b2) */

In contrast to the $ A array with the $new array, it's up to you to add or subtract.

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