<?php $array = [ 0 => 'Apple', 2 => 'Orange', 5 => 'Pear', 8 => 'Pear' ]; var_export( array_fill(0, array_key_last($array), null) + $array ); echo "\n---\n"; var_export( $array + array_fill(0, array_key_last($array), null) ); echo "\n---\n"; var_export( array_merge( array_fill(0, array_key_last($array), null), $array ) );
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