<?php $a = [0, 1, 2, 3, 4, 5, 6, 7]; $count = count($a); $span = 5; // most sensible with odd numbers $center = (int)($span / 2); foreach ($a as $i => $v) { printf( "%d: %s\n", $i, implode( ',', array_slice( $a, min($count - $span, max(0, $i - $center)), $span ) ) ); }
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