I'm trying to parse a 6,000 line 500 KB file into an array so I can import the data into our system. The problem is that the script stops executing somewhere between lines 3000-4000. There are no breaks in the code, we use it on other imports. Any ideas on why this might be happening and what I can do to prevent it?

/**
 * Takes a seperated value string and makes it an array
 * @param $delimiter string The delimiter to be seperated by, usually a comma or tab
 * @param $string string The string to seperate
 * @return array The resulting array
 */
public function svToArray ($delimiter, $string) {
    $x = 0;
    $rowList = array();
    $splitContent = preg_split("#\n+#", trim($string));
    foreach ($splitContent as $key => $value) {
        $newData = preg_split("#".$delimiter."#", $value);
        if ($x == 0) {
            $headerValues = array_values($newData);
        } else {
            $tempRow = array();
            foreach ($newData as $rowColumnKey => $rowColumnValue) {                                                
                $tempRow[$headerValues[$rowColumnKey]] = $rowColumnValue;
            }
            $rowList[] = $tempRow;
        }
        $x++;
    }
    return $rowList;
}