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apply_filters( 'the_content', string $content )

Filters the post content.

Parameters

$content

(string) Content of the current post.

More Information

This filter is used to filter the content of a post after it is retrieved from the database and before it is printed to the screen.

Usage

When using this filter it’s important to check if you’re filtering the content in the main query with the conditionals is_main_query() and in_the_loop(). The main post query can be thought of as the primary post loop that displays the main content for a post, page or archive. Without these conditionals you could unintentionally be filtering the content for custom loops in sidebars, footers, or elsewhere.

add_filter( 'the_content', 'filter_the_content_in_the_main_loop', 1 );

function filter_the_content_in_the_main_loop( $content ) {

    // Check if we're inside the main loop in a single Post.
    if ( is_singular() && in_the_loop() && is_main_query() ) {
        return $content . esc_html__( 'I’m filtering the content inside the main loop', 'wporg');
    }

    return $content;
}

Source

File: wp-includes/post-template.php

View on Trac

Used By

Used By Description
wp-includes/rest-api/endpoints/class-wp-rest-revisions-controller.php: WP_REST_Revisions_Controller::prepare_item_for_response()

Prepares the revision for the REST response.
wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php: WP_REST_Attachments_Controller::prepare_item_for_response()

Prepares a single attachment output for response.
wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php: WP_REST_Posts_Controller::prepare_item_for_response()

Prepares a single post output for response.
wp-includes/formatting.php: wp_trim_excerpt()

Generates an excerpt from the content, if needed.
wp-includes/feed.php: get_the_content_feed()

Retrieve the post content for feeds.
wp-includes/post-template.php: the_content()

Display the post content.
wp-includes/comment.php: do_trackbacks()

Perform trackbacks.

Changelog

Version Description
0.71 Introduced.

© 2003–2019 WordPress Foundation
Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/hooks/the_content