从CSV数据字符串中删除换行符(PHP 5.3之前)

id,data,other
1,"This is data
with a line break I want replacing",1
2,"This is a line with no line break in the data",0
3,No quotes,42
4,"Quoted field with ""quotes inside"" which is tricky",84

我想,如果CSV数据中有换行符,那么该行上必须有一个奇数(不成对)引号.如果存在这样的行,则删除其换行符并检查新创建的行是否有效.
以下伪PHP代码应该可以工作.事物行Reader和containsOddNumberOfQuotes()在PHP 5.2中很容易实现：

function fixCsv($fileOrString) {
    $reader = new Reader($fileOrString);
    $correctCsv = "";
    while ($reader->hasMoreLines()) {
        $correctCsv = $correctCsv . fixLine($reader,$reader->readLine()) . "n";
    }
    return $correctCsv;
}

/** Recursive function that returns a valid CSV line. */
function fixLine($reader,$line) {
    if (containsOddNumberOfQuotes($line)) {
        if ($reader->hasMoreLines()) {
            // Try to make a valid CSV line by joining this line with the next one.
            return fixLine($reader,line . $reader->readLine())
        }
        throw new Exception("Last line is incomplete.");
    }
    else {
        return $line;
    }
}