PHP的foreach使用嵌套阵? [英] PHP foreach with Nested Array?
问题描述
我有我想要显示结果的子集嵌套数组。例如,在阵列上下面我通过在嵌套数组的所有值要循环[1]
I have a nested array in which I want to display a subset of results. For example, on the array below I want to loop through all the values in nested array[1].
Array
(
[0] => Array
(
[0] => one
[1] => Array
(
[0] => 1
[1] => 2
[2] => 3
)
)
[1] => Array
(
[0] => two
[1] => Array
(
[0] => 4
[1] => 5
[2] => 6
)
)
[2] => Array
(
[0] => three
[1] => Array
(
[0] => 7
[1] => 8
[2] => 9
)
)
)
我尝试使用foreach功能,但我似乎无法得到这个工作。这是我原来的语法(虽然我知道这是错的)。
I was trying to use the foreach function but I cannot seem to get this to work. This was my original syntax (though I realise it is wrong).
$tmpArray = array(array("one",array(1,2,3)),array("two",array(4,5,6)),array("three",array(7,8,9)));
foreach ($tmpArray[1] as $value) {
echo $value;
}
我试图避免的密钥是否相同,我想搜索的关键,即一个变量进行比较。
I was trying to avoid a variable compare on whether the key is the same as the key I want to search, i.e.
foreach ($tmpArray as $key => $value) {
if ($key == 1) {
echo $value;
}
}
任何想法?
推荐答案
如果您知道嵌套数组的级别数,您可以简单地做嵌套循环。像这样:
If you know the number of levels in nested arrays you can simply do nested loops. Like so:
// Scan through outer loop
foreach ($tmpArray as $innerArray) {
// Check type
if (is_array($innerArray)){
// Scan through inner loop
foreach ($innerArray as $value) {
echo $value;
}
}else{
// one, two, three
echo $innerArray;
}
}
如果你不知道数组,你需要使用递归的深度。见下面的例子:
if you do not know the depth of array you need to use recursion. See example below:
// Multi-dementional Source Array
$tmpArray = array(
array("one", array(1, 2, 3)),
array("two", array(4, 5, 6)),
array("three", array(
7,
8,
array("four", 9, 10)
))
);
// Output array
displayArrayRecursively($tmpArray);
/**
* Recursive function to display members of array with indentation
*
* @param array $arr Array to process
* @param string $indent indentation string
*/
function displayArrayRecursively($arr, $indent='') {
if ($arr) {
foreach ($arr as $value) {
if (is_array($value)) {
//
displayArrayRecursively($value, $indent . '--');
} else {
// Output
echo "$indent $value \n";
}
}
}
}
在code下面只显示嵌套数组与您的具体情况的值(第三级只)
The code below with display only nested array with values for your specific case (3rd level only)
$tmpArray = array(
array("one", array(1, 2, 3)),
array("two", array(4, 5, 6)),
array("three", array(7, 8, 9))
);
// Scan through outer loop
foreach ($tmpArray as $inner) {
// Check type
if (is_array($inner)) {
// Scan through inner loop
foreach ($inner[1] as $value) {
echo "$value \n";
}
}
}
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