How to assign a class to a page with a custom template?

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Using is_page(8) will make your code a bit static. Let’s make it dynamic as you’re after with is_page_template():

<?php
function prefix_conditional_body_class( $classes ) {
    if( is_page_template('mytemplate.php') )
        $classes[] = 'mytemplate';

    return $classes;
}
add_filter( 'body_class', 'prefix_conditional_body_class' );

Worked for me in a child theme with the template file in the root of the child theme, using template twentyfifteen.

And I don’t know why you need another class to be added, if you are using body_class() you will already get two classes there: page-template-mytemplate and page-template-mytemplate-php. They will be unique and you can use them.

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