pp-wp-snippet-use-first-paragraph-as-excerpt.php

<?php
// This code snippet uses the first paragraph of an article as excerpt

// use an anonymous function to filter the excerpt
// this changes the behavior of the function the_excerpt() to use the first paragraph
add_filter( 'wp_trim_excerpt', function( $text, $raw_excerpt ) {
    $content = apply_filters( 'the_content', get_the_content() );
    return substr( $content, 0, strpos( $content, '</p>' ) + 4 );
  } ), 10, 2 );
  
?>