the_content

is the core hook of the content.

Description

apply_filters( 'the_content',  $post_post_content ); 

Usage

    The following example is for adding a hook callback.

$post_post_content = apply_filters( 'the_content', $post_post_content );                    
if ( !empty( $post_post_content ) ) { 
   // everything has led up to this point... 
} 

    To remove a hook callback, use the example below.

// define the the_content callback 
function filter_the_content( $post_post_content ) { 
    // make filter magic happen here... 
    return $post_post_content; 
}; 
        
// add the filter 
add_filter( 'the_content', 'filter_the_content', 10, 1 ); 

    To remove a hook callback, use the example below.   

// remove the filter 
remove_filter( 'the_content', 'filter_the_content', 10, 1 );