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<?php
function get_cat_ID( $cat_name='General' ) {
    $cat = get_term_by( 'name', $cat_name, 'category' );
    if ( $cat )
        return $cat->term_id;
    return 0;
}
?>

• Function Reference/get cat ID « WordPress Codex
  5.1 Basic. 6 Notes; 7 Change Log; 8 Source File; 9 Related. Description. Retrieve the ID of a category from its name. Usage. <?php get_cat_ID( $cat_name ) ?> ...
  codex.wordpress.org
• WordPress › Support » Tags — get_cat_ID
  Password (forgot?) Register · WordPress › Support » get_cat_ID ...
  wordpress.org
• WordPress › Support » Using get_cat_id and get_cat_name on ...
  I wanted to used get_cat_id and get_cat_name to get ID's and names from that taxonomy but those two function only looks at the main Categories under the ...
  wordpress.org
• get_cat_ID() WordPress function reference, arguments and source ...
  Signature. get_cat_ID( $cat_name = 'General' ). cat_name: (string) Optional. Default is 'General' and can be any category name. Default: 'General' ...
  queryposts.com

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