Appending code to the_content

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I’m trying to append some php code to the_content in a custom loop. I do not want to add a function because I only want to append the code to one instance of the_content, not throughout the whole site.

I’m using the Read More Right Here plugin to enable viewers to read a whole post (after clicking the more tag) that displays on the page (without going to single post). And I’m using the Advanced Custom Fields plugin to output some content (when a check box is ticked in the back end) that I want to display at the end of each post. If I place my code to output the check box data AFTER the_content in my template, the info is displayed underneath the more tag. My aim is to append this to the bottom of the_content so that it is hidden (along with the rest of the post after the more tag) until you click ‘read more’ (and the rest of the post is revealed).

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The code I am trying to append to the end of the_content is: 

<?php
if( in_array( 'frazer-barton', get_field('who_specialises') ) )
{
echo '<img src="http://andersonlloyd.php.wired.co.nz/wp-content/themes/all/images/example-thumb.jpg" />';
}
if( in_array( 'sarah-simmers', get_field('who_specialises') ) )
{
echo '<img src="http://andersonlloyd.php.wired.co.nz/wp-content/themes/all/image/example2-thumb.jpg" />';
}
else {
echo '';
}
?>

I am not a PHP developer so any help on this is hugely appreciated.

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1 comment

  1. You are looking to filter the_content.

    In your theme’s functions.php or in a plugin:

    function wpse74288_content_filter( $content ) {
    /* save field into variable, such as to call get_field only once
     * not required, but more efficient */
    $who_specialises = get_field('who_specialises');
    /* append to content on condition */
    if ( in_array( 'frazer-barton', $who_specialises ) ) {
        /* use correct img src attributes, shortened only for representation here */
        $content .= '<img src="http://andersonlloyd...images/example-thumb.jpg" />';
    } elseif ( in_array( 'sarah-simmers', $who_specialises ) ) {
        $content .= '<img src="http://andersonlloyd.../images/example2-thumb.jpg" />';
    }
    /* return the content, whether appending happened or not */
    return $content;
}
add_filter( 'the_content', 'wpse74288_content_filter' );

    As an aside, this question is probably the dupe of a dupe of a dupe [+ n dupes], had you known what to search for.