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You can use the wp_trim_words() to trim the words or
substr() to trim the characters. Here’s how to do it:
$content = wp_trim_words( get_sub_field('resumen'), $num_words = 10, '<a href="'.get_permalink().'">...Read More</a>' );
And for the characters:
$content = trim(substr( get_sub_field('resumen'), 0, 50)).'<a href="'.get_permalink().'">...Read More</a>';
Hope this helps 🙂
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