How should I efficiently delete elements from a PHP array?

Question

In this case I have an array that is parsed from a JSON file. Normally I use all the elements in the array, but for AJAX crawling I only show the parts the search engine asked for:

<?php $fitstyles = json_decode(file_get_contents(DATA_FILE), true); ?>
…
<?php
if ($base == "fits" || $base == "gallery") {
    /* For fragment handler, delete out the parts of the fits array that aren't needed. */
    $keep_fit = $fragments[1];
    $keep_style = $fragments[2];
    foreach ($fitstyles as $fit => $styles) {
        if ($fit != $keep_fit) {
            unset($fitstyles[$fit]);
            continue;
        }
        foreach ($styles as $style => $styleinfo) {
            if ($style != $keep_style) {
                unset($fitstyles[$fit][$style]);
                continue;
            }
        }
    }
} ?>

Here, $fragments looks like:

(
    [0] => fits
    [1] => straight
    [2] => utility
)

and $fitstyles takes the following form:

Array
(
    [straight] => Array
        (
            [utility] => Array
                ( … )
        )
    [anotherfit] => Array
        (
            [anotherstyle] => ( … )
        )
)

The approach appears to work; however, please give me feedback as to the effectiveness, efficiency and readability of this approach.

Answer 1

Your code is just fine, exactly how I would do it.

There isn't much to discuss really, it's kind of simple. It's as effective / efficient as it could be, and fairly readable.