PHP JSON Encode

[FooKelvin]

Hi All,

 

Here is my code, trying to encode the result from database.

$stmt = sqlsrv_query($conn, $result);
$data = array();
while ($row = sqlsrv_fetch_array($stmt, SQLSRV_FETCH_ASSOC)) {
    $data[] = $row;
}

//echo json_encode( $data );

$out = array();
foreach($data as $element) {
        $out[$element['category']][] = array($element['trainFunction']=> $element['value1']);
}

echo json_encode( $out );

Result of JSON Echo:

{"November":[{"A":7},{"B":8},{"C":3},{"D":4}],"December":[{"A":1},{"B":2},{"C":1}]}

Expected Output:

{
	"November": [{
		"A": 7,
		"B": 8,
		"C": 3,
		"D": 4
	}],
	"December": [{
		"A": 1,
		"B": 2,
		"C": 1
	}]
}

[FooKelvin]

Update Expected Output:

[{
	"A": 7,
	"B": 8,
	"C": 3,
	"D": 4,
	"category": "November"
}, {
	"A": 1,
	"B": 2,
	"C": 1,
	"category": "December"
}]

[requinix]

Start by building

{
	"November": {
		"A": 7,
		"B": 8,
		"C": 3,
		"D": 4,
		"category": "November"
	},
	"December": {
		"A": 1,
		"B": 2,
		"C": 1,
		"category": "December"
	}
}

You're close to that already:

$out[$element['category']][] = array($element['trainFunction']=> $element['value1']);

Move the trainFunction value into the empty [] to specify a key, then remove the array() part so that it's just value1.

 

Then use array_values() on $out to strip off the outermost keys and turn it into a regular array.

[FooKelvin]

Thanks Requinix,

 

I have change to 

foreach($data as $element) {
        $out[$element['category']][$element['trainFunction']] = $element['value1'];
}

Output:

{"November":{"Engineering":7,"Leadership & Soft Skills":8,"Lean":3,"Quality":4},"December":{"Engineering":2,"Leadership & Soft Skills":3,"Quality":1}}

But i do not understand,

"use array_values() on $out to strip off the outermost keys and turn it into a regular array. "

[requinix]

You also need a line of code that adds the month category into the array. Outside of the loop.

$out[$element['category']]['category'] = $element['category'];

Take a look at the documentation for array_values. Do you see what it does to arrays? It strips off the custom keys and replaces them with regular numeric keys.

You need to do that to your array before you json_encode() it - those custom keys vs numeric keys are what makes the difference between getting {} objects or [] arrays in the JSON.

[FooKelvin]

You also need a line of code that adds the month category into the array. Outside of the loop.

$out[$element['category']]['category'] = $element['category'];

Take a look at the documentation for array_values. Do you see what it does to arrays? It strips off the custom keys and replaces them with regular numeric keys.

You need to do that to your array before you json_encode() it - those custom keys vs numeric keys are what makes the difference between getting {} objects or [] arrays in the JSON.

 

Yes Requinix,

Thanks for the explanation, its really helps me!