2
it adds additional value before and after each Like query
That {d146fc7cb41ff444163abadd50ac5da7ec5439fd51386c3cfe2cea107126703b} is a placeholder escape string for the literal % (percent) sign used in prepared statements (see wpdb::prepare()) and the escape string is generated by wpdb::placeholder_escape().
So actually, that {...
1
You can achieve the OR relation using the tax_query argument like so:
$query->set( 'tax_query', array(
'relation' => 'OR',
array(
'taxonomy' => 'category',
'terms' => array( 2, 3 ),
),
array(
'taxonomy' => 'post_tag',
'terms' => array( 10, 13 ),
),
) );
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