Truncate a string to whole words for a given string length

gistfile1.php

<?php

$model = "Big ultra super car with mega turbo charger";
$limit = 10;

$words = explode(' ', $model);
$sentence = '';

foreach ($words as $word) {
	$sentence .= $word . ' ';
	if (strlen($sentence) >= $limit) {
		break;
	}
}

$sentence .= '...';
print($sentence . "\n");