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1.当array是一个从0开始的连续数组时,json_encode出来的结果是一个由[]括起来的字符串

而当array是不从0开始或者不连续的数组时,json_encode出来的结果是一个由{}括起来的key-value模式的字符串

复制代码 代码如下:
$test = array();
$test[] = 1;
$test[] = 1;
$test[] = 1;
echo json_encode($test);

结果:

[1,1,1]

复制代码 代码如下:
$test = array();
$test[] = 1;
$test[] = 1;
$test[] = 1;
unset($test[0]);
echo json_encode($test);

结果:

{"1":1,"2":1}

2.当字符串为[1,1,1] 这种模式时,json_decode默认解析出来的结果是一个数组,

当字符串为{"1":1,"2":1} 这种模式时,json_decode默认解析出来的结果是一个对象,此时可以设置它的第二个参数为true强制让它返回数组

3.由于php无法区分一维数组和二维数组,才会出现以上情况,因为使用json编码时推荐将第二个参数设置为true

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