对于通过curl访问的数据，str_replace不用逗号替换空格。 PHP

Question

    $csv = curl_exec($curl);
    curl_close($curl);

    $csv = str_replace(" ", ",", $csv);

    echo $csv;

475064,700,1170134 464073,53,145098 334552,52,123754 480652,58,238502 569677,52,135520 883946,13,2012 445735,43,50649 743921,35,23380 736097,23,6902 779420,36,24887 -1,1,0 693512,26,9632 396218,35,22960 469085,37,29814 744808,15,2518 644784,27,10122 466101,10,1250 136344,59,259114 361312,32,16880 332231,42,48228 353406,9,1000 216824,32,16912 355831,9,1000 -1,1,0 151118,14 -1,-1 -1,-1

由于某种原因，str_replace命令无法处理此$csv字符串。