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preg_match VS preg_match_all

$html = '<html><title>This is title </title><body><p>aaa</p><p>bbb</p><p>ccc</p></body></html>';
if(preg_match('/<title>(.*)<\/title>/', $html, $match)){
	print_r($match);
}

$html = '<html><title>This is title </title><body><p>aaa</p><p>bbb</p><p>ccc</p></body></html>';
if(preg_match_all('/<p>(.*)<\/p>/', $html, $matchAll)){
	print_r($matchAll);
}
if(preg_match_all('/<p>(.*)<\/p>/U', $html, $matchAllU)){
	print_r($matchAllU);
}

//output
Array
(
    [0] => <title>This is title </title>
    [1] => This is title 
)
Array
(
    [0] => Array
        (
            [0] => <p>aaa</p><p>bbb</p><p>ccc</p>
        )

    [1] => Array
        (
            [0] => aaa</p><p>bbb</p><p>ccc
        )

)
Array
(
    [0] => Array
        (
            [0] => <p>aaa</p>
            [1] => <p>bbb</p>
            [2] => <p>ccc</p>
        )

    [1] => Array
        (
            [0] => aaa
            [1] => bbb
            [2] => ccc
        )

)