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I want to disable all category's hierarchy in default categories widget. With a code in functions.php . But how? Thanks in advance.

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why do you not want to un-tick the 'show hierarchy' button in the widget? – Michael Sep 1 '12 at 20:29

I did! Write this codes in functions.php

add_filter( 'widget_categories_args', 'force_widget_cat_args' );

function force_widget_cat_args($cat_args) {       

$cat_args['hierarchical'] = 0;

return $cat_args;

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