PHP code (WITH tags)

If you start your php block with a php closing tag (to close the embedded opening tag) and end the block with a starting tag (to open the embedded closing tag) then you should be able to put your complete php in between.

Unfortunately it doesn’t work…
this is my code pasted directly into the template that works…

<?php
echo '<ul>';
global $post;
$taxonomy = 'category';
// get the term IDs assigned to post.
$post_terms = wp_get_object_terms( $post->ID, $taxonomy, array( 'fields' => 'ids' ) );
// separator between links
$separator = ', ';
if ( !empty( $post_terms ) && !is_wp_error( $post_terms ) ) { $term_ids = implode( ',' , $post_terms ); wp_list_categories( 'title_li=&style=list&hierarchical=1&echo=1&taxonomy=' . $taxonomy . '&include=' . $term_ids ); }
echo '</ul>';
?>

This is the code in your plugin that doesn’t work…

?>
<?php
echo '<ul>';
global $post;
$taxonomy = 'category';
// get the term IDs assigned to post.
$post_terms = wp_get_object_terms( $post->ID, $taxonomy, array( 'fields' => 'ids' ) );
// separator between links
$separator = ', ';
if ( !empty( $post_terms ) && !is_wp_error( $post_terms ) ) { $term_ids = implode( ',' , $post_terms ); wp_list_categories( 'title_li=&style=list&hierarchical=1&echo=1&taxonomy=' . $taxonomy . '&include=' . $term_ids ); }
echo '</ul>';
?>
<?php

this works…

;?>
<?php
echo '<ul>';
global $post;
$taxonomy = 'category';
// get the term IDs assigned to post.
$post_terms = wp_get_object_terms( $post->ID, $taxonomy, array( 'fields' => 'ids' ) );
// separator between links
$separator = ', ';
if ( !empty( $post_terms ) && !is_wp_error( $post_terms ) ) { $term_ids = implode( ',' , $post_terms ); wp_list_categories( 'title_li=&style=list&hierarchical=1&echo=1&taxonomy=' . $taxonomy . '&include=' . $term_ids ); }
echo '</ul>';
?>
<?php;