PHP: count(): Parameter must be an array or an object that implements Countable-CodePudding

I am new to php. I have these errors appearing on some Wordpress pages.

Warning: count(): Parameter must be an array or an object that implements Countable in /www/tastingvictoria_289/public/wp-content/themes/astra-child/template-parts/content-single.php on line 38

Warning: Invalid argument supplied for foreach() in /www/tastingvictoria_289/public/wp-content/themes/astra-child/template-parts/content-single.php on line 40

This is the related code.

<?php $terms = get_the_terms( $post->ID , 'category' ); 
        $total = count($terms); // 38
        $i=0;
        foreach ( $terms as $term ) {
            if($term->slug != "featured-post"){
                $i  ;
                $term_link = get_term_link( $term, 'category' );
                if( is_wp_error( $term_link ) )
                continue;
                echo '<p ><span><a  href="' . $term_link . '">' . $term->name . '</a></span></p>';
                if ($i != $total) echo ' ';
            }
            
        } 
        ?>

Any explanation?

CodePudding user response：

As the error message, the $term parameter that you pass into count() function is not countable (in some case - eg, the post id is not exit).

To fix this, please change your code into:

<?php $terms = get_the_terms( $post->ID , 'category' );
if(is_array($terms)){
    $total = count($terms); // 38
    $i=0;
    foreach ( $terms as $term ) {
        if($term->slug != "featured-post"){
            $i  ;
            $term_link = get_term_link( $term, 'category' );
            if( is_wp_error( $term_link ) )
            continue;
            echo '<p ><span><a  href="' . $term_link . '">' . $term->name . '</a></span></p>';
            if ($i != $total) echo ' ';
        }
        
    }
  }
?>

CodePudding user response：

Convert the $terms to an array for getting valid result of count($terms).