/wp-content/themes/Avada/includes/class-avada-blog.php

<?php

class Avada_Blog {

    public function __construct() {

        add_filter( 'excerpt_length', array( $this, 'excerpt_length' ), 999 );
        add_action( 'pre_get_posts', array( $this, 'alter_search_loop' ), 1 );

        if ( ! is_admin() ) {
            add_filter( 'pre_get_posts', array( $this, 'search_filter' ) );
            add_filter( 'pre_get_posts', array( $this, 'empty_search_filter' ) );
        }

    }

    /**
     * Modify the default excerpt length
     */
    public function excerpt_length( $length ) {

        // Normal blog posts excerpt length
        if ( ! is_null( Avada()->settings->get( 'excerpt_length_blog' ) ) ) {
            $length = Avada()->settings->get( 'excerpt_length_blog' );
    	}

        // Search results excerpt length
        if ( is_search() ) {
            $length = Avada()->settings->get( 'excerpt_length_blog' );
        }

        return $length;

    }

    /**
     * Apply post per page on search pages
     */
    public function alter_search_loop( $query ) {
        if ( ! is_admin() && $query->is_main_query() && $query->is_search() && Avada()->settings->get( 'search_results_per_page' ) ) {
            $query->set( 'posts_per_page', Avada()->settings->get( 'search_results_per_page' ) );
        }
    }

    /**
     * Apply filters to the search query.
     * Determines if we only want to display posts/pages and changes the query accordingly
     */
    public function search_filter( $query ) {

        if ( is_search() && $query->is_search ) {

            // Show only posts in search results
            if ( 'Only Posts' == Avada()->settings->get( 'search_content' ) ) {
                $query->set('post_type', 'post');
            }
            // Show only pages in search results
            elseif ( 'Only Pages' == Avada()->settings->get( 'search_content' ) ) {
                $query->set( 'post_type', 'page' );
            }

        }

    	return $query;

    }

    /**
     * make wordpress respect the search template on an empty search
     */
    public function empty_search_filter( $query ) {

        if ( isset( $_GET['s'] ) && empty( $_GET['s'] ) && $query->is_main_query() ) {
            $query->is_search = true;
    		$query->is_home   = false;
    	}

    	return $query;

    }

    /**
     * get the content of the post
     * strip it and apply any changes required to the excerpt first.
     */
    public function get_content_stripped_and_excerpted( $excerpt_length, $content ) {
        $pattern = get_shortcode_regex();
    	$content = preg_replace_callback( "/$pattern/s", 'avada_extract_shortcode_contents', $content );
    	$content = explode( ' ', $content, $excerpt_length + 1 );

    	if ( $excerpt_length < count( $content ) ) {
    		array_pop( $content );
    	}

    	$content = implode( ' ',$content );
    	$content = preg_replace( '~(?:\[/?)[^/\]]+/?\]~s', '', $content ); // strip shortcodes and keep the content
    	$content = str_replace( ']]>', ']]&gt;', $content );
    	$content = strip_tags( $content );
    	$content = str_replace( array( '"', "'" ), array( '&quot;', '&#39;' ), $content );
    	$content = trim( $content );

    	return $content;

    }

    /**
     * Retrieve the content and apply and read-more modifications needed.
     */
    public function content( $limit, $strip_html ) {

        global $more;

        $content = '';

        // Sanitizing the limit value
        $limit = ( ! $limit && $limit != 0 ) ? 285 : intval( $limit );

        $test_strip_html = $strip_html;

        $test_strip_html = ( $strip_html == "true" || $strip_html == true ) ? true : false;

        $custom_excerpt = false;

        $post = get_post( get_the_ID() );

        $pos = strpos( $post->post_content, '<!--more-->' );

        $readmore = ( Avada()->settings->get( 'link_read_more' ) ) ? ' <a href="' . get_permalink( get_the_ID() ) . '">&#91;...&#93;</a>' : ' &#91;...&#93;';
        $readmore = ( Avada()->settings->get( 'disable_excerpts' ) ) ? '' : $readmore;

        if ( $test_strip_html ) {

            $more = 0;
			$raw_content = wp_strip_all_tags( get_the_content( '{{read_more_placeholder}}' ), '<p>' );

			// Strip out all attributes
			$raw_content = preg_replace('/<(\w+)[^>]*>/', '<$1>', $raw_content);

			$raw_content = str_replace( '{{read_more_placeholder}}', $read_more, $raw_content );

            if ( $post->post_excerpt || false !== $pos ) {
                $raw_content    = ( ! $pos ) ? wp_strip_all_tags( rtrim( get_the_excerpt(), '[&hellip;]' ), '<p>' ) . $read_more : $raw_content;
                $custom_excerpt = true;
            }

        } else {

            $more = 0;
            $raw_content = get_the_content( $readmore );
            if ( $post->post_excerpt || false !== $pos ) {
                $raw_content    = ( ! $pos ) ? rtrim( get_the_excerpt(), '[&hellip;]' ) . $readmore : $raw_content;
                $custom_excerpt = true;
            }

        }

        if ( $raw_content && ! $custom_excerpt ) {

            $pattern = get_shortcode_regex();
            $content = preg_replace_callback( "/$pattern/s", 'avada_extract_shortcode_contents', $raw_content );

            if ( 'Characters' == Avada()->settings->get( 'excerpt_base' ) ) {

                $content  = mb_substr( $content, 0, $limit );
                $content .= ( $limit != 0 && ! Avada()->settings->get( 'disable_excerpts' ) ) ? $readmore : '';

            } else {

                $content = explode( ' ', $content, $limit + 1 );

                if ( $limit < count( $content ) ) {

                    array_pop( $content );
                    $content = implode( ' ',$content );
                    if ( ! Avada()->settings->get( 'disable_excerpts' ) ) {
                        $content .= ( $limit != 0 ) ? $readmore : '';
                    }

                } else {

                    $content = implode( ' ',$content );

                }

            }

            if ( $limit != 0 && ! $test_strip_html ) {

                $content = apply_filters( 'the_content', $content );
                $content = str_replace( ']]>', ']]&gt;', $content );

            } else {
				$content = sprintf( '<p>%s</p>', $content );
			}

            $strip_html_class = ( $test_strip_html ) ? 'strip-html' : '';
            $content = sprintf( '<div class="excerpt-container %s">%s</div>', $strip_html_class, do_shortcode( $content ) );

            return $content;

        }

        if ( true == $custom_excerpt ) {

            $pattern = get_shortcode_regex();
            $content = preg_replace_callback( "/$pattern/s", 'avada_extract_shortcode_contents', $raw_content );

            if ( true == $test_strip_html ) {

                $content = apply_filters( 'the_content', $content );
                $content = str_replace( ']]>', ']]&gt;', $content );
                $content = '<div class="excerpt-container strip-html">' . do_shortcode( $content ) . '</div>';

            } else {

                $content = apply_filters( 'the_content', $content );
                $content = str_replace( ']]>', ']]&gt;', $content );

            }

        }

        if ( has_excerpt() ) {

            $content = do_shortcode( get_the_excerpt() );
            $content = '<p>' . $content . '</p>';

        }

        return $content;

    }

}

// Omit closing PHP tag to avoid "Headers already sent" issues.