get_cat_ID( string $cat_name )

Retrieves the ID of a category from its name.

Parameters

$cat_name

(Required) Category name.

Return

(int) Category ID on success, 0 if the category doesn't exist.

Source

File: wp-includes/category.php 

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

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Changelog

Changelog
Version Description
1.0.0 Introduced.