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How can I add a conditinal statement

New conditional statements can be added by any other plugin or theme.

Example of adding a new conditional statement

add_filter( 'if_menu_conditions', 'my_new_menu_conditions' );

function my_new_menu_conditions( $conditions ) {
$conditions[] = array( 'name' => 'If single custom-post-type', // name of the condition 'condition' => function() { // callback - must return TRUE or FALSE return is_singular( 'my-custom-post-type' ); } ); }