<?php $array = [ 0 => 'Apple', 2 => 'Orange', 5 => 'Pear', 8 => 'Pear' ]; $result = []; for ( $i = 0, $last = array_key_last($array); $i <= $last; ++$i ) { $result[$i] = $array[$i] ?? null; } var_export($result); echo "\n---\n"; var_export( array_replace( array_fill(0, array_key_last($array), null), $array ) );
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