Online PHP editor | output for YO1Pi

<?php function calculateLevels( $total, $iteration = 0 ) { if( $total <= 1 ) { return $iteration; } else { return calculateLevels( (int) ( $total / 2 ), $iteration + 1 ); } } $x = 15; echo "$x - " .calculateLevels( $x ) . "\n"; $x = 10; echo "$x - " .calculateLevels( $x ) . "\n"; $x = 8; echo "$x - " .calculateLevels( $x ) . "\n"; $x = 7; echo "$x - " .calculateLevels( $x ) . "\n"; $x = 1; echo "$x - " .calculateLevels( $x ) . "\n"; $x = 2; echo "$x - " .calculateLevels( $x ) . "\n"; $x = 3; echo "$x - " .calculateLevels( $x ) . "\n";