Most frequently words in a text

Hello everybody,


I am creating an algorithm to identify the most frequently words on =20
different sentences, using the following code:

// store in $arr_frequencyids all different words
for($i=3D0; $i { array_push($arr_frequencyids,explode(" ",$arr_phrase[$i])); }
// use a hash using words as keys, and increment as frequency
for ($i=3D0; $i {
$str_thisword =3D $arr_frequencywords[$i];
$hash_frequencywords[$str_thisword]++;
}
// descendent sort based on values
arsort($hash_frequencywords);
// store in $arr_20mostusedwords the 20 most frequent words
$arr_20mostusedwords =3D array_slice(array_keys($hash_frequencywords,0,20));


But... is not working. It is not counting the ocurrences. It stores as =20
a long string, even I used explode or trying a direct array addition =20
(arr1 +=3D arr2).

Warning: Wrong parameter count for array_keys() in =20
/home/mipyme/public_html/jpanel/index.php on line 204
Warning: Wrong parameter count for array_slice() in =20
/home/mipyme/public_html/jpanel/index.php on line 204
Warning: array_slice() [function.array-slice]: The first argument =20
should be an array in /home/mipyme/public_html/jpanel/index.php on =20
line 205

Could you give me some direction? (the information comes from a DB, =20
but for simplifying process I asume an array instead a while DB fetch =20
row)

Thank you,


Alejandro

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