adjust the_excerpt based on template page

You can add it straight to the template before the header in most cases…

<?php /* Template Name: Products */ ?>
<?php 
  add_filter( 'excerpt_length', function( $length ) {  return 10; }, 999);
  get_header(); 
?>

These should work as well if you’d rather put in functions.php:

Method 2: In the loop

$slug = get_page_template_slug($post->ID);
if('page-products.php' == $slug) {
        add_filter( 'excerpt_length', function( $length ) { 
           return 20; 
        }, 999);    
}

Method 3: Outside the loop

if ( is_page_template( 'page-products.php' ) ) {
    add_filter( 'excerpt_length', function( $length ) { 
       return 20; 
    }, 999);
}

This could also be used to get the template….

global $post;
$template = get_post_meta($post->ID,'_wp_page_template',true);

Or possibly even this (untested):

add_action('get_header', function() {
    if ( is_page( array( 37, 'Products' ) ) ) {
        add_filter( 'excerpt_length', function( $length ) { 
           return 20; 
        }, 999);
    }
}, 1);

Or as seen here, you can create your own function to allow the excerpt length to be determined on a need to need basis by the amount of characters.

function excerpt($limit) {
  $excerpt = explode(' ', get_the_excerpt(), $limit);
  if (count($excerpt)>=$limit) {
    array_pop($excerpt);
    $excerpt = implode(" ",$excerpt).' ...';
  } else {
    $excerpt = implode(" ",$excerpt);
  } 
  $excerpt = preg_replace('`\[[^\]]*\]`','',$excerpt);
  return $excerpt;
}

The to display:

<?php echo excerpt(50); ?>

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