foreach 是否保证在 php 中按数组顺序迭代？
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Is foreach guaranteed to iterate in the array order in php?
提问by John
When an array is passed to foreachis the output order guaranteed to be the same as the input? I know in some languages that the output order is not guaranteed since each element is processed at the same time.
传递数组时是否foreach保证输出顺序与输入相同？我知道在某些语言中无法保证输出顺序，因为每个元素都是同时处理的。
For example, I'm passing a sorted array to foreachto write to a file. I want to be sure that the array will be sorted in the output file.
例如，我将一个排序数组传递foreach给写入文件。我想确保数组将在输出文件中排序。
采纳答案by Poonam Bhatt
Yes ...whatever order you will give to foreach it will iterate in same orders. And in your case array will be sorted in the output file.
是的......无论你给 foreach 什么顺序，它都会以相同的顺序迭代。在你的情况下array will be sorted in the output file.
回答by Hibou57
The relevant reference might not be that of foreachor sorting as previously mentionned, but that of array instead.
相关的引用可能不是foreach前面提到的of或排序，而是数组的引用。
Language reference?—?Arrayssays:
An array in PHP is actually an ordered map.
PHP 中的数组实际上是一个有序映射。
回答by fastcodejava
This is correct, foreachwill output in same order as the input array .
这是正确的，foreach将按照与输入数组相同的顺序输出。
回答by Fenton
Yes - the items will be output in the same order they are in within the array.
是 - 项目将按照它们在数组中的相同顺序输出。
