Does the string
["first","second","third"]
always preserve array order and result in the PHP array
array('first','second','third');
when using json_decode()? I realize the answer is NO for objects, but I am asking about a string representing an array as input.
字符串
[“first”，“second “，”第三个“]
始终保留数组顺序并生成PHP数组
数组（' 第一个'，'秒'，'第三个'）;
使用 json_decode（）时？ 我意识到答案是对象没有，但我问的是一个表示数组的字符串作为输入。
Yes. Arrays are ordered by definition, and JSON preserves this.
The JSON specification says:
An array structure is a pair of square bracket tokens surrounding zero or more values. The values are separated by commas. The order of the values is significant.
The last sentence implies that a JSON encoder or decoder that changes the order is not in conformance with the specification. I can't find anything in the PHP documentation that explicitly says that it observes this requirement, but I think it can be assumed since it claims to be implementing JSON.
Yes order will be kept.
Alternatively you can use cast array to object, as order of object variables are not modified json_encode((object)$arr).
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