February 12, 2011 
Definition:
function is_page_template($template = '') {}
Whether currently in a page template.
This template tag allows you to determine if you are in a page template. You can optionally provide a template name and then the check will be specific to that template.
Parameters
- string $template: The specific template name if specific matching is required.
Return values
returns:False on failure, true if success.
Source code
function is_page_template($template = '') {
if (!is_page()) {
return false;
}
global $wp_query;
$page = $wp_query->get_queried_object();
$custom_fields = get_post_custom_values('_wp_page_template',$page->ID);
$page_template = $custom_fields[0];
// We have no argument passed so just see if a page_template has been specified
if ( empty( $template ) ) {
if ( !empty( $page_template ) and ( 'default' != $page_template ) ) {
return true;
}
} elseif ( $template == $page_template) {
return true;
}
return false;
}
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