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I am trying to use show post_class() within $output loop.Though i tried it different way i failed.

Here is my codes

$output = '<div ';
post_class('blog-list-vertical-content');
$output .= '" id=' . get_the_ID() . '>';
2

You should use get_post_class()

From Codex:

get_post_class() is not simply a non-echoing alternative to post_class(). get_post_class() does not return a string, but an array that must be processed to produce text similar to what is echoed by post_class().

So

$classes = get_post_class();
$output = '<div id="' . get_the_ID() . '" class="' . implode(" ", $classes) . '"></div>';

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