How to add read more in wordpress - php

Question

I have tried many things but i didn't get Read more link in paragraph
page.php
<?php
$args = array( 'post_type' => 'post', 'posts_per_page' => 10 );
$loop = new WP_Query( $args );
while ( $loop->have_posts() ) : $loop->the_post();
echo '<div class="inner-box-post">';
echo '<h2><a href="get_permalink();">';
the_title();
echo '</a></h2>';
echo '<div class="thumbnail">';
the_post_thumbnail( 'thumbnail' );
get_comments( $args );
echo '</div>';
echo '<div class="post-containt">';
echo '<div class="post-date"><strong>';
echo get_the_date();
echo '</strong> </div>';
echo the_excerpt(); ;
echo '</div> ';
echo '</div>';
endwhile; ?>
</div>
function.php
function new_excerpt_more($output) {
return $output . '<p>' . 'Read more &raquo' . '</p>';
}
add_filter('get_the_excerpt', 'new_excerpt_more');

Answer 1

Filter is excerpt_more,
add_filter('excerpt_more', 'new_excerpt_more');
Reference.

Answer 2

THIS IS NOT AN ANSWER, JUST CORRECTIONS
You really don't need to overuse echo in your code. Just use opening and closing php tags correctly. Rather use this. It also helps with readibility
<?php
$args = array( 'post_type' => 'post', 'posts_per_page' => 10 );
$loop = new WP_Query( $args );
while ( $loop->have_posts() ) : $loop->the_post();
?>
<div class="inner-box-post">
<h2><?php the_title(); ?></h2>
<div class="thumbnail">
<?php the_post_thumbnail( 'thumbnail' ); ?>
<?php get_comments( $args ); ?>
</div>
<div class="post-containt">
<div class="post-date"><strong>
<?php get_the_date(); ?>
</strong> </div>
<?php the_excerpt(); ?>
</div>
</div>
<?php endwhile; ?>
</div>

Answer 3

<?php
$args = array( 'post_type' => 'post', 'posts_per_page' => 10 );
$loop = new WP_Query( $args );
while ( $loop->have_posts() ) : $loop->the_post();
?>
<div class="inner-box-post">
<h2><?php the_title(); ?></h2>
<div class="thumbnail">
<?php the_post_thumbnail( 'thumbnail' ); ?>
<?php get_comments( $args ); ?>
</div>
<div class="post-containt">
<div class="post-date">
<strong><?php echo get_the_date(); ?></strong>
</div>
<?php the_excerpt(); ?>
</div>
</div>
<?php endwhile; ?>
Remove [...] and add read more option using
function new_excerpt_more($output) {
$output = rtrim($output,'[...]');
return $output . '<p>' . 'Read more >>' . '</p>';
}
add_filter('excerpt_more', 'new_excerpt_more');