How can one output only the content before the <!--more--> tag in WordPress using PHP?

To output only the content before the <!--more--> tag in WordPress using PHP, you can use the `get_the_content()` function to retrieve the full content of the post and then use the `strstr()` function to find the position of the <!--more--> tag. Finally, you can use the `substr()` function to extract and display the content before the <!--more--> tag.

$post_content = get_the_content();
$more_tag_position = strpos($post_content, '<!--more-->');
if ($more_tag_position !== false) {
    $content_before_more = substr($post_content, 0, $more_tag_position);
    echo $content_before_more;
} else {
    echo $post_content;
}