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   Contributed by joncomputing — 2 years ago

   You can choose whether $content will have Shortcodes processed before or after your the_content function has executed by setting the Priority in add_filter. The default (10) will process Shortcodes after you have returned $content at the end of your Filter function. A large figure, such as 99, will already have processed Shortcodes before your Filter function is passed $content.
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   Contributed by Benjamin Intal — 2 years ago

   Note that the_content filter isn’t used when get_the_content() function is called.
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   Contributed by hearvox — 10 months ago

   Example

   /* Add a paragraph only to Pages. */
   function my_added_page_content ( $content ) {
       if ( is_page() ) {
           return $content . '<p>Your content added to all pages (not posts).</p>';
       }
   }
   add_filter( 'the_content', 'my_added_page_content');
   
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   Contributed by SeanM88 — 6 months ago

   Consolidate multiple string replacement filters
   String replacements are a common reason for filtering the_content and with PHP7 you can now consolidate multiple callback functions using preg_replace_callback_array(); if it makes sense to.

   Example:

   add_filter( 'the_content', 'multiple_string_replacements');
   function multiple_string_replacements ( $content ) {
   	if ( is_single() && in_the_loop() && is_main_query() ) {
   		return preg_replace_callback_array([
   			// 1. Removes WordPress injected <p> tags surrounding images in post content.
   			'/<p>\s*(<a .*>)?\s*(<img .* \/>)\s*(<\/a>)?\s*<\/p>/iU' => function ( &$matches ) {
   				return $matches[1] . $matches[2] . $matches[3];
   			},
   			// 2. Adds custom data-attribute to <p> tags providing a paragraph id number.
   			'|<p>|' => function ( &$matches ) {
   				static $i = 1;
   				return sprintf( '<p data-p-id="%d">', $i++ );
   			},
   		], $content );
   	}
   	return $content;
   }
   

   Expand full source codeCollapse full source code

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