Split Strings in Half (Word-Aware) with PHP

Question

I\'m trying to split strings in half, and it should not split in the middle of a word.

So far I came up with the following which is 99% working :

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Answer 1

function split_half($string, $center = 0.4) {
        $length2 = strlen($string) * $center;
        $tmp = explode(' ', $string);
        $index = 0; 
        $result = Array('', '');
        foreach($tmp as $word) {
            if(!$index && strlen($result[0]) > $length2) $index++;
            $result[$index] .= $word.' ';
        }
        return $result;
}

Demo: http://codepad.viper-7.com/I58gcI