What’s the internal concatenation function for creating Excerpts with WordPress?

Use wp_trim_words( $text, $num_words, $more_text )

The first argument is the text to trim, the second is the number of words you want and the third is the truncation text which defaults to an ellipsis.

The function is located in wp-includes/formatting.php line 1920 (v3.3.1)

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