WordPress hooks/filters insert before content or after title

trying to insert content before the post content in my functions.php – I know how to use the regular wp hooks, but unsure how to insert into other areas.

Tried this, but it kills content on any other post type:

function property_slideshow( $content ) {
 if ( is_single() && 'property' == get_post_type() ) {
    $custom_content = '[portfolio_slideshow]';
    $custom_content .= $content;
    return $custom_content;
    } 
}
add_filter( 'the_content', 'property_slideshow' );

How do I make this conditional?

Contents hide

Answers:

Method 1

Edit

Edit 2

Method 2

Method 3

Answers:

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Method 1

Just use the the_content filter, e.g.:

<?php
function theme_slug_filter_the_content( $content ) {
    $custom_content = 'YOUR CONTENT GOES HERE';
    $custom_content .= $content;
    return $custom_content;
}
add_filter( 'the_content', 'theme_slug_filter_the_content' );
?>

Basically, you append the post content after your custom content, then return the result.

Edit

As Franky @bueltge points out in his comment, the process is the same for the post title; simply add a filter to the the_title hook:

<?php
function theme_slug_filter_the_title( $title ) {
    $custom_title = 'YOUR CONTENT GOES HERE';
    $title .= $custom_title;
    return $title;
}
add_filter( 'the_title', 'theme_slug_filter_the_title' );
?>

Note that, in this case, you append your custom content after the Title. (It doesn’t matter which; I just went with what you specified in your question.)

Edit 2

The reason your example code isn’t working is because you only return $content when your conditional is met. You need to return $content, unmodified, as an else to your conditional. e.g.:

function property_slideshow( $content ) {
    if ( is_single() && 'property' == get_post_type() ) {
        $custom_content = '[portfolio_slideshow]';
        $custom_content .= $content;
        return $custom_content;
    } else {
        return $content;
    }
}
add_filter( 'the_content', 'property_slideshow' );

This way, for posts not of the ‘property’ post-type, $content is returned, un-modified.

Method 2

There was a new hook introduced in 5.2 that triggers after the opening <body> tag. No more need to mess with the post content.

wp_open_body

/**
 * Add code snippets directly after the opening <body> tag.
 */
function add_to_top_of_body() {
    echo '<!-- Google Tag Manager (noscript) --><noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-YOURMOM" height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript><!-- End Google Tag Manager (noscript) -->';
}
add_action( 'wp_body_open', 'add_to_top_of_body' );

Method 3

function property_slideshow( $content ) {
    if ( is_singular( 'property' ) ) {
        $custom_content = do_shortcode( '[portfolio_slideshow]' );
        $custom_content .= $content;
        }
        return $custom_content;
}
add_filter( 'the_content', 'property_slideshow' );

The is_singular conditional tag checks if a singular post is being displayed and enables you to specify the $post_types parameter which in this case is property.

Also, you might want to look at do_shortcode

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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