索引数组中的 PHP 关联数组

Question

我有一个$string:

'Name   Height  Weight
 John   177     142
 Jill   156     123
 Jacob  183     157'

我正在将其转换为具有以下结构的 $array:

Array (
    [0] => Array (
        ['Name'] => 'John'
        ['Height'] => '177'
        ['Weight'] => '142'
    )
    [1] = > Array (
        ['Name'] => 'Jill'
        ['Height'] => '156'
        ['Weight'] => '123'
    )
    [2] = > Array (
        ['Name'] => 'Jacob'
        ['Height'] => '183'
        ['Weight'] => '157'
    )
)

使用以下代码:

$rows = explode("\n",$string); //creates an indexed array of rows as strings
$headers = explode("\t",$rows[0]); //creates an indexed array of headers as strings
$rows = array_slice($rows,1); //removes headers from $rows
$array = Array();
foreach($rows as $row) {
    $array[] = array_combine($headers, explode("\t",$row)); //creates associative arrays for each row
}

但是，我无法访问索引 $array 中的关联数组

例如，这不起作用:

echo $array[0]['Name'];

即使 echo implode(', ', array_keys($array[0])); 给出:

Name, Height, Weight

我尝试了许多不同的方法来访问索引数组中的关联数组，但没有成功。我做错了什么？

编辑:

所以，

$string = "Name Height  Weight
John    177 142
Jill    156 123
Jacob‌​ 183 157";

没有效果，但是

$string = "Name\tHeight\tWeight\nJohn\t177\t142\nJill\t156\t123\nJacob‌​‌​\t183\t157";

有没有...

所以我想问题是:有什么区别？我如何将前一个字符串解释为后者？

Answer 1

您的代码不会生成该数组结构，但可以像这样修复它:

$string = 'Name   Height  Weight
 John   177     142
 Jill   156     123
 Jacob  183     157';

$rows = explode("\n",$string); //creates an indexed array of rows as strings

$headers = preg_split("#\s+#",trim($rows[0], "\n\r\t ")); //creates an indexed array of headers as strings, by splitting by any white space
var_dump($headers);

$rows = array_slice($rows,1); //removes headers from $rows
$array = Array();
foreach($rows as $row) {
    $array[] = array_combine($headers, preg_split("#\s+#",trim($row, "\n\r\t "))); //creates associative arrays for each row, by splitting by any white space
}

var_dump($array);

这会产生输出:

array(3) {
  [0]=>
  string(4) "Name"
  [1]=>
  string(6) "Height"
  [2]=>
  string(6) "Weight"
}
array(3) {
  [0]=>
  array(3) {
    ["Name"]=>
    string(4) "John"
    ["Height"]=>
    string(3) "177"
    ["Weight"]=>
    string(3) "142"
  }
  [1]=>
  array(3) {
    ["Name"]=>
    string(4) "Jill"
    ["Height"]=>
    string(3) "156"
    ["Weight"]=>
    string(3) "123"
  }
  [2]=>
  array(3) {
    ["Name"]=>
    string(5) "Jacob"
    ["Height"]=>
    string(3) "183"
    ["Weight"]=>
    string(3) "157"
  }
}

主要思想是您必须用任何额外的空格修剪每行字符串并按最长的空格序列拆分。