Set a custom excerpt or content character length

custom-content-excerpt-length.php

<?php
// Set a custom excerpt length
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;
}

// place this in the loop
echo excerpt(25);

// Set a custom content length
function content($limit) {
    $content = explode(' ', get_the_content(), $limit);
    if (count($content)>=$limit) {
    array_pop($content);
    $content = implode(" ",$content).'...';
    } else {
    $content = implode(" ",$content);
    }
    $content = preg_replace('/[.+]/','', $content);
    $content = apply_filters('the_content', $content);
    $content = str_replace(']]>', ']]&gt;', $content);
    return $content;
}

// Place this in the loop
$content = get_the_content();
echo wp_trim_words( $content , '25' );

?>