the_content( string $more_link_text = null, bool $strip_teaser = false )
Display the post content.
Parameters
- $more_link_text
-  (string) (Optional) Content for when there is more text. Default value: null 
- $strip_teaser
-  (bool) (Optional) Strip teaser content before the more text. Default value: false 
More Information
If the quicktag <!--more--> is used in a post to designate the “cut-off” point for the post to be excerpted, the_content() tag will only show the excerpt up to the <!--more--> quicktag point on non-single/non-permalink post pages. By design, the_content() tag includes a parameter for formatting the <!--more--> content and look, which creates a link to “continue reading” the full post.
- 
Notes about <!--more--> : - No whitespaces are allowed before the “more” in the <!--more--> quicktag. In other words <!-- more --> will not work!
- The <!--more--> quicktag will not operate and is ignored in Templates where just one post is displayed, such as single.php.
- Read Customizing the Read More for more details.
 
Source
File: wp-includes/post-template.php
function the_content( $more_link_text = null, $strip_teaser = false ) {
	$content = get_the_content( $more_link_text, $strip_teaser );
	/**
	 * Filters the post content.
	 *
	 * @since 0.71
	 *
	 * @param string $content Content of the current post.
	 */
	$content = apply_filters( 'the_content', $content );
	$content = str_replace( ']]>', ']]>', $content );
	echo $content;
}  Changelog
| Version | Description | 
|---|---|
| 0.71 | Introduced. | 
    © 2003–2021 WordPress Foundation
Licensed under the GNU GPLv2+ License.
    https://developer.wordpress.org/reference/functions/the_content