php - Conditional Check -

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i trying make conditional code dependent on if user has left or right bar disabled. have following

<?php  $left_sidebar = 'off'; $right_sidebar = 'on';   if ($left_sidebar == 'on' || $right_sidebar == 'on') {     $left_sidebar_width = 'four_columns';    $right_sidebar_width = 'four_columns';    $center_width = 'eight_columns';  } else if ($left_sidebar == 'on' || $right_sidebar == 'off') {     $left_sidebar_width = 'four_columns';    $right_sidebar_width = 'disabled';    $center_width = 'twelve_columns';  } else if ($left_sidebar == 'off' || $right_sidebar == 'on') {     $left_sidebar_width = 'disabled';    $right_sidebar_width = 'four_columns';    $center_width = 'twelve_columns';  } else {     $left_sidebar_width = 'disabled';    $right_sidebar_width = 'disabled';    $center_width = 'sixteen_columns'; }  echo $left_sidebar_width; echo '<br />'; echo $right_sidebar_width; echo '<br />'; echo $center_width; echo '<br />';  ?>

the problem have no matter change $left_sidebar or $right_sidebar says

four_columns four_columns eight_columns

what doing wrong makes not change when turn 1 of sidebars off?

because have:

$left_sidebar = 'off'; $right_sidebar = 'on';

and using "or" logical operator, match first if statement because $right_sidebar on. change "or" || operator "and" && , should expected results. 

if ($left_sidebar == 'on' && $right_sidebar == 'on') {     $left_sidebar_width = 'four_columns';    $right_sidebar_width = 'four_columns';    $center_width = 'eight_columns';  } else if ($left_sidebar == 'on' && $right_sidebar == 'off') {     $left_sidebar_width = 'four_columns';    $right_sidebar_width = 'disabled';    $center_width = 'twelve_columns';  } else if ($left_sidebar == 'off' && $right_sidebar == 'on') {     $left_sidebar_width = 'disabled';    $right_sidebar_width = 'four_columns';    $center_width = 'twelve_columns';  } else {     $left_sidebar_width = 'disabled';    $right_sidebar_width = 'disabled';    $center_width = 'sixteen_columns'; }

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