How to change value of variable in theme file with functions.php WordPress?

I want to change values of the variable in my theme. I don’t want to edit in this file because after update theme, it will be lost.

So, I want to update values of this variable in functions.php.

In post-simple.php file:

<p class=”from_the_blog_excerpt small-font show-next”>
<?php
$excerpt = get_the_excerpt();
echo string_limit_words( $excerpt, 15 );
?>
</p>

I want to change values 15(the length of string) to another value in the function string_limit_words($excerpt, $length).

In functions.php of child theme, I write this code look like:

function custom_excerpt_length( $excerpt, $length ) {
$length = 30;
return $length;
}
add_filter( ‘flatsome_string_limit_words’, ‘custom_excerpt_length’, 999 );

I tried to change values of $length to values 30 instead of 15 like default set on post-simple.php file.

But it does not a success. It still return $length = 15.

Read more here:: How to change value of variable in theme file with functions.php WordPress?

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