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'

我正在把它变成如下结构的$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 内的关联数组

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，但都没有成功。我做错了什么？

编辑：

所以，

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

不起作用，但是

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

确实...

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，但可以这样修复：

$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"
  }
}

主要思想是你必须用任何额外的空格修剪每一行字符串，并用最长的空格序列分割。

Answer 2

//Use following code it will work as your answer 
$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

$headers = explode("\t",$rows[0]); //creates an indexed array of headers as strings

$headers=array_filter(explode(" ",$headers[0])); ///t convert to space and filter remove empty element

$rows = array_slice($rows,1); //removes headers from $rows

$array = Array();
foreach($rows as $row) {
    $row=explode("\t",$row);
    $row=array_filter(explode(" ",$row[0]));

    $array[] = array_combine($headers,$row); //creates associative arrays for each row
}

//print_r($array);
echo $array[0]['Name'];