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I have a few categories with the same name [some of them are sub-categories]. And I want to get an array of ID's for certain cattegory name. I tried this:

 $term = get_term_by('name', $cat_name, 'category');

but it seems that get_term_by() returns only the first term that match the query.

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up vote 3 down vote accepted

The only alternative I know of (using core functions) is:

// Get terms whose name begins with "my_name"
get_terms( 'category', array( 'name__like' => 'my_name' ) );

// Get terms whose name contains "my_name"
get_terms( 'category', array( 'search' => 'my_name' ) );

If you need an exact match, you'll have to execute a custom query.

$wpdb->get_results( "SELECT t.*, tt.* FROM $wpdb->terms AS t
    INNER JOIN $wpdb->term_taxonomy AS tt ON t.term_id = tt.term_id
    WHERE tt.taxonomy = 'category' AND t.name = 'my_name'"
);
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Thank you very much. Before your answer I did: $id = array(); $args = array( 'hide_empty' => 0, ); $categories = get_categories( $args ); foreach($categories as $c){ if ($c->name == $cat_name){ $id[] = $c->term_id; } } – s976 Jul 22 '12 at 11:06

get_cat_ID( $cat_name ) can do the trick! Example:

<?php
     $category_id = get_cat_ID('Category Name');
     $q = 'cat=' . $category_id;
     query_posts($q);
     if (have_posts()) : while (have_posts()) : the_post();

     the_content();

     endwhile; endif;
?>

MORE Detail!

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