<?php
$input = 'к';
$data = array('Москва', 'Балашиха', 'Химки', 'Подольск', 'Королев', 'Электросталь', 'Коломна');
$result = array_filter($data, function ($item) use ($input) { return true;
}
return false;
});
echo '<ul>';
echo '<li>' . implode( '</li><li>', $result) . '</li>'; echo '</ul>';
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