is_product_tag() │ WC 1.0

Checks if the current page is a product tag page. Conditional tag.

This is a wrapper for the function is_tax():

is_tax( 'product_tag', $term );

No Hooks.

true|false.

is_product_tag( $term );

$term(string/array/number): The name, slug, or ID of the product tag. If nothing is specified, the function will simply check if we are on any product tag page.
Default: ''

if( is_product_tag() ) {
	// this is the product tag page
}
else {
	// this is another page (not the product tag)
}

Check the product tag page for the 'custom-tag' slug:

if( is_product_tag( 'custom-tag' ) ){
	// product tag 'custom-tag'
}

Let's check by taxonomy term ID:

if( is_product_tag( 55 ) ){
	// tag with ID 55
}

Let's check several tags at once - whether we are on the page of any of them:

if( is_product_tag( [ 50, 55 ] ){
	// this is a page of one of the tags with ID 50 or 55
}

function is_product_tag( $term = '' ) {
	return is_tax( 'product_tag', $term );
}