直接修改foreach中的数组元素会导致值覆盖下一个元素 - Directly modifying array elements in foreach causes value to overwrite the next element

Directly modifying array elements in foreach causes value to overwrite the next element

我的简单循环获取一个坐标和地名列表，例如：

(59.436961) (24.753575) (Revel, Estonia) (Born)
(-34.847745) (138.507362) (Port Adelaide) (Disembarked)
(-33.177085) (138.010057) (Port Pirie) (Residence before enlistment)

它preg_split将它们放入数组$coords中，效果非常好。然后，我在foreach循环中对它们进行迭代。我的问题是为什么这样做：

foreach ($coords as &$marker){
    $marker = preg_split('/'') ''(|''(|'')/', $marker, -1, PREG_SPLIT_NO_EMPTY);
}
print_r($coords);

结果：

Array
(
    [0] => Array
        (
            [0] => 59.436961
            [1] => 24.753575
            [2] => Revel, Estonia
            [3] => Born
        )
    [1] => Array
        (
            [0] => -34.847745
            [1] => 138.507362
            [2] => Port Adelaide
            [3] => Disembarked
        )
    [2] => Array
        (
            [0] => -34.847745
            [1] => 138.507362
            [2] => Port Adelaide
            [3] => Disembarked
        )
)

(注意元素[1]和[2]是相同的(-但这是：

foreach ($coords as $marker){
    $marker_array[] = preg_split('/'') ''(|''(|'')/', $marker, -1, PREG_SPLIT_NO_EMPTY);
}
print_r($marker_array);

结果：

Array
(
    [0] => Array
        (
            [0] => 59.436961
            [1] => 24.753575
            [2] => Revel, Estonia
            [3] => Born
        )
    [1] => Array
        (
            [0] => -34.847745
            [1] => 138.507362
            [2] => Port Adelaide
            [3] => Disembarked
        )
    [2] => Array
        (
            [0] => -33.177085
            [1] => 138.010057
            [2] => Port Pirie
            [3] => Residence before enlistment
        )
)

当我试图直接修改循环中的元素时，是否有什么地方我做错了，或者我不知道？

在PHP 5.6中，我看不到所描述的行为。如何解析原始列表？

当我运行时：

<?php
$coords = array('(59.436961) (24.753575) (Revel, Estonia) (Born)',
    '(-34.847745) (138.507362) (Port Adelaide) (Disembarked)',
    '(-33.177085) (138.010057) (Port Pirie) (Residence before enlistment)');
foreach ($coords as &$marker){
    $marker = preg_split('/'') ''(|''(|'')/', $marker, -1, PREG_SPLIT_NO_EMPTY);
}
print_r($d);

它给了我这个：

Array
(
    [0] => Array
        (
            [0] => 59.436961
            [1] => 24.753575
            [2] => Revel, Estonia
            [3] => Born
        )
    [1] => Array
        (
            [0] => -34.847745
            [1] => 138.507362
            [2] => Port Adelaide
            [3] => Disembarked
        )
    [2] => Array
        (
            [0] => -33.177085
            [1] => 138.010057
            [2] => Port Pirie
            [3] => Residence before enlistment
        )
)

但我不会后悔使用这种疯狂的建筑！

如果您从文本中解析它，那么只需使用preg_match_all和类似的模式：

'~'(()')'s*'(()')'s*'(()')'s*'(()')~mu'

即使您在数组中有数据，我强烈建议您使用preg_match进行可预测的数据匹配，而不是使用preg_split。但没有人在第一天成为大师