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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code | 
|---|---|
| 244 |      $content = get_the_content( $more_link_text, $strip_teaser ); | 
| 245 |  | 
| 246 |      /** | 
| 247 |       * Filters the post content. | 
| 248 |       * | 
| 249 |       * @since 0.71 | 
| 250 |       * | 
| 251 |       * @param string $content Content of the current post. | 
| 252 |       */ | 
| 253 |      $content = apply_filters( 'the_content', $content ); | 
| 254 |      $content = str_replace( ']]>', ']]>', $content ); | 
| 255 |      echo $content; | 
| 256 | } | 
| 257 |  | 
| 258 | /** | 
| 259 |  * Retrieves the post content. | 
| 260 |  * | 
| 261 |  * @since 0.71 | 
| 262 |  * @since 5.2.0 Added the `$post` parameter. |