WP_Query offset argument does not work

I want to display all posts starting from a certain offset, my query is:

WP_Query( array(
    'posts_per_page'    = -1,
    'offset'            = 20,
    'cat'               = 5,
) );

This query shows all posts without starting from the offset value. Whys is that?

Topic offsets wp-query posts Wordpress

Category Web

1
answered at

The offset index for WP_Query generally works with pagination. When you set pagination to a -1 the function assumes you're getting all posts and there will be no pagination or offset. So to counteract this you would set the posts_per_page to a high number like 999. Reading the Function Reference on WP_Query the pagination section says:

'posts_per_page'=>-1 to show all posts (the 'offset' parameter is ignored with a -1 value). Set the ‘paged’ parameter if pagination is off after using this parameter.

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