Finding repeated words in PHP without specifying the word itself

Question

I\'ve been thinking about something for a project I want to do, I\'m not an advance user and I\'m just learning. Do not know if this is possible:

Suppose we have 100

Answer 1

function get_word_counts($phrases) {
   $counts = array();
    foreach ($phrases as $phrase) {
        $words = explode(' ', $phrase);
        foreach ($words as $word) {
          $word = preg_replace("#[^a-zA-Z\-]#", "", $word);
            $counts[$word] += 1;
        }
    }
    return $counts;
}

$phrases = array("It takes an ocean of water not to break!", "An ocean is a body of saline water, or so I am told.");

$counts = get_word_counts($phrases);
arsort($counts);
print_r($counts);

OUTPUT

Array
(
    [of] => 2
    [ocean] => 2
    [water] => 2
    [or] => 1
    [saline] => 1
    [body] => 1
    [so] => 1
    [I] => 1
    [told] => 1
    [a] => 1
    [am] => 1
    [An] => 1
    [an] => 1
    [takes] => 1
    [not] => 1
    [to] => 1
    [It] => 1
    [break] => 1
    [is] => 1
)

EDIT
Updated to deal with basic punctuation, based on @Jack's comment.