如何使用 PHP 解析每行都用方括号括起来的 CSV？

Question

我在尝试传递从伦敦交通局收到的提要时偶然发现了 CSV 格式。 使用 PHP 解析它的最佳方法是什么？

http://countdown.api.tfl.gov.uk/interfaces/ura/instant_V1?circle=51.49288,-0.147425,100&ReturnList=StopPointName,EstimatedTime,StopID

[4,"1.0",1418639278611]
[1,"Eccleston Bridge","35312",1418639472000]
[1,"Eccleston Bridge","35312",1418639395000]
[1,"Eccleston Bridge","35312",1418639397000]
[1,"Eccleston Bridge","35312",1418639696000]
[1,"Eccleston Bridge","35312",1418639742000]
[1,"Eccleston Bridge","35312",1418639731000]
[1,"Eccleston Bridge","35312",1418640051000]
[1,"Eccleston Bridge","35312",1418639938000]
...

谢谢。

Answer 1

由于每一行单独看起来像JSON，你可以使用json_decode()的位置：

// input as string
$input = '....';

// split by lines
$lines = explode( "\n", $input );

// walk through results
for( $i=0; $i<count($lines); $i++ ) {

  // parse row
  $row = json_decode( $lines[i] );

  // do something with it ...

}

Answer 2

将每一行解析为单独的字符串后，您可以使用substr()来修剪括号。

例如：

echo substr("1418639472000]",0,-1);
> 1418639472000

和

echo substr("[1234",1);
> 1234

Answer 3

这将为您提供每行的关联数组

$file = file('http://countdown.api.tfl.gov.uk/interfaces/ura/instant_V1?circle=51.49288,-0.147425,100&ReturnList=StopPointName,EstimatedTime,StopID');

array_walk($file, function(&$line) {
    $line = json_decode($line);
    if (count($line) == 3) {
        $line = array_combine(array('id', 'count', 'timestamp'), $line);
    } else {
        $line = array_combine(array('id', 'station_name', 'station_id', 'timestamp'), $line);
    }
});

print_r($file);

Answer 4

您不需要对json_decode()进行迭代调用。 因为严格格式化的字符串几乎是有效的 json，所以您只需要用逗号替换换行符，然后将单个字符串包裹在方括号中，然后json_decode()就准备好吞噬字符串并吐出索引数组的索引数组。 请注意，在某些系统上，您可能需要替换\\r\\n而不仅仅是\\n 。

代码：（演示）

$bracedCSV = <<<CSV
[4,"1.0",1418639278611]
[1,"Eccleston Bridge","35312",1418639472000]
[1,"Eccleston Bridge","35312",1418639395000]
[1,"Eccleston Bridge","35312",1418639397000]
[1,"Eccleston Bridge","35312",1418639696000]
[1,"Eccleston Bridge","35312",1418639742000]
[1,"Eccleston Bridge","35312",1418639731000]
[1,"Eccleston Bridge","35312",1418640051000]
[1,"Eccleston Bridge","35312",1418639938000]
CSV;

var_export(
    json_decode('[' . str_replace("\n", ',', $bracedCSV) . ']')
);

输出：

array (
  0 => 
  array (
    0 => 4,
    1 => '1.0',
    2 => 1418639278611,
  ),
  1 => 
  array (
    0 => 1,
    1 => 'Eccleston Bridge',
    2 => '35312',
    3 => 1418639472000,
  ),
  2 => 
  array (
    0 => 1,
    1 => 'Eccleston Bridge',
    2 => '35312',
    3 => 1418639395000,
  ),
  3 => 
  array (
    0 => 1,
    1 => 'Eccleston Bridge',
    2 => '35312',
    3 => 1418639397000,
  ),
  4 => 
  array (
    0 => 1,
    1 => 'Eccleston Bridge',
    2 => '35312',
    3 => 1418639696000,
  ),
  5 => 
  array (
    0 => 1,
    1 => 'Eccleston Bridge',
    2 => '35312',
    3 => 1418639742000,
  ),
  6 => 
  array (
    0 => 1,
    1 => 'Eccleston Bridge',
    2 => '35312',
    3 => 1418639731000,
  ),
  7 => 
  array (
    0 => 1,
    1 => 'Eccleston Bridge',
    2 => '35312',
    3 => 1418640051000,
  ),
  8 => 
  array (
    0 => 1,
    1 => 'Eccleston Bridge',
    2 => '35312',
    3 => 1418639938000,
  ),
)