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For example, if I search the site with the following parameters. http://localhost/?s=KEYWORD&tag[]=TAG1&tag[]=TAG2

This is like saying that Posts where [keyword is 'KEYWORD'] OR [has 'TAG1' tag] OR [has 'TAG2' tag].

So this is an "OR search", I don't want that, I want "AND search". How can I change this default behavior??

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  • Ajax search lite is the best search plugin for WP. It supports your required functionality. Replacing the default WordPress search requires you to write a plugin yourself - and don't modify the core. See this page from the codex: codex.wordpress.org/Creating_a_Search_Page – user3135691 Jul 12 '17 at 9:08
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The default is "AND search" but not "OR search".

We can see that here in the WP_Query::parse_search() method:

if ( ! empty( $search ) ) {
    $search = " AND ({$search}) ";

Here I've posted a hack, some time ago, to get the OR version.

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