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Retrieves the value of the total number of comments, Trackbacks, and Pingbacks for a post. Unlike comments_number() this function will return the value as a numeric value.
<?php $my_var = get_comments_number( $post_id ); ?>
To make get_comments_number work like comments_number you can use this code.
$num_comments = get_comments_number(); // get_comments_number returns only a numeric value
if ( comments_open() ) {
if ( $num_comments == 0 ) {
$comments = __('No Comments');
} elseif ( $num_comments > 1 ) {
$comments = $num_comments . __(' Comments');
} else {
$comments = __('1 Comment');
}
$write_comments = '<a href="' . get_comments_link() .'">'. $comments.'</a>';
} else {
$write_comments = __('Comments are off for this post.');
}