How to save a nested json in txt file with php

Question

How can I quick and easy save a JSON nested with php. What I mean with nested is this:

nested json:

{
    "key1":"value",
    "key2":"value",
    "key3":"value",
    "key4":{
        "key1":"value",
        "key2":"value",
        "key3":"value"
    },
    "key5":{
        "key1":"value",
        "key2":"value",
        "key3":"value"
    }
}

json plain in one line (When I just use echo json_encode($array)) :

{"key1":"value","key2":"value","key3":"value","key4":{"key1":"value","key2":"value","key3":"value"},"key5":{"key1":"value","key2":"value","key3":"value"}}

The reason I want this is that the json must be easy readable for humans. When everything is smacked on one line that doesn't help.

Answer 1

为json_encode使用正确的$options参数（PHP> = 5.4）

echo json_encode($object, JSON_PRETTY_PRINT);