A multidimensional array Json_encode after an object is generated instead of an array __js

The Json_encode function can encode an array of PHP, and the return value is a JSON-formatted string.

For multidimensional arrays to Json_encode, I always thought it was a return array form (like {{obj1}, {obj2}, {obj3}}), but today the interface is returned to the client discovery as an object rather than an array (in the form of [{... ...},{.....},{...}] ), not convenient for client operation, check the code only to find that I previously a unset operation to the multidimensional array of the first unit to delete, resulting in a different return results.

Look at the code below:

$arr = Array (
<span style= "White-space:pre" >	</span>0=>array (' name ' => ' John ', ' age ' => ') ),
<span style= "White-space:pre" >	</span>1=>array (' name ' => ' Dick ', ' age ' => ' 111 '),
<span style= "White-space:pre" >	</span>2=>array (' name ' => ' Harry ', ' Age ' => ' 233 ')
);


$res = Json_encode ($arr);
echo "<script>console.log (' $res ');</script>";

The results are as follows:

Then look after the first index is removed:

$arr = Array (
	0=>array (' name ' => ' John ', ' Age ' => ' "),
	1=>array (' name ' => ' Dick ', ' age ' => ' 111 ') ,
	2=>array (' name ' => ' Harry ', ' Age ' => ' 233 ')
);

unset ($arr [0]); 
$res = Json_encode ($arr);
echo "<script>console.log (' $res ');</script>";

The solution is to use the Sort function to index again.

$arr = Array (
	0=>array (' name ' => ' John ', ' Age ' => ' "),
	1=>array (' name ' => ' Dick ', ' age ' => ' 111 ') ,
	2=>array (' name ' => ' Harry ', ' Age ' => ' 233 ')
);

unset ($arr [0]); 
Sort ($arr);
$res = Json_encode ($arr);
echo "<script>console.log (' $res ');</script>";