Trying create an associative array? - php

Question

I have an array
Array
(
[0] => Array
(
[NT_NOTAFINAL] => 10.00
[M_DESCRICAO] => ARTE
[PE_DESCRICAO] => 1 BIMESTRE
)
[1] => Array
(
[NT_NOTAFINAL] => 10.00
[M_DESCRICAO] => ARTE
[PE_DESCRICAO] => 2 BIMESTRE
)
[2] => Array
(
[NT_NOTAFINAL] => 10.00
[M_DESCRICAO] => ARTE
[PE_DESCRICAO] =>3 BIMESTRE
)
)
Now I'm trying create an associative array to return JSON something like this:
"Materia":[{"descricao":"ARTE", "Notas":["1 BIMESTRE":10.00, "2 BIMESTRE":10.00, "3 BIMESTRE":10.00]}]
I don't know how I could create this associative array to this JSON result from this array that I'm posting.
I'm trying create like this but the result what I need does not return
$notas = '';
$materia = '';
foreach($lista as $value){
if($value["M_DESCRICAO"] != $materia){
$materia = $value["M_DESCRICAO"];
}
$notas = array("Descricao"=>$materia, "Notas"=>array($value["PE_DESCRICAO"]=>$value["NT_NOTAFINAL"]));
}
$result = array("Materia"=>array($notas));
echo json_encode($result);
The result to what I'm trying is
{
"Materia": [
{
"Descricao": "ARTE",
"Notas": {
"3 BIMESTRE": "10.00"
}
}
]
}
How could I create this associative array to return this JSON like I need ?
Edit
$notas = array();
$materia = '';
$materia_array = array();
foreach($lista as $value){
if($materia == ''){
$materia = $value["M_DESCRICAO"];
}
if($value["M_DESCRICAO"] != $materia){
array_push($materia_array, (array("Descricao"=>$materia,"Notas"=>$notas)));
$notas = array();
$materia = $value["M_DESCRICAO"];
}else{
array_push($notas, array($value["PE_DESCRICAO"]=>$value["NT_NOTAFINAL"]));
}
}
$result = array("Materia"=>$materia_array);
echo json_encode($result);
Result
{
"Materia": [
{
"Descricao": "ARTE",
"Notas": [
{
"1 BIMESTRE": "10.00"
},
{
"2 BIMESTRE": "10.00"
},
{
"3 BIMESTRE": "10.00"
}
]
},
{
"Descricao": "C.SOCIAIS",
"Notas": [
{
"2 BIMESTRE": "10.00"
},
{
"3 BIMESTRE": "9.50"
}
]
},
{
"Descricao": "CIÊNCIAS E P. S.",
"Notas": [
{
"2 BIMESTRE": "9.50"
},
{
"3 BIMESTRE": "10.00"
}
]
}
]
}

Answer 1

I've refactored your last edit to remove some code duplication and complexity.
$result = array();
foreach ($lista as $value) {
$materia = $value['M_DESCRICAO'];
if (!isset($result[$materia])) {
$result[$materia] = array(
'Descricao' => $materia,
'Notas' => array()
);
}
$result[$materia]['Notas'][] = array(
$value['PE_DESCRICAO'] => $value['NT_NOTAFINAL']
);
}
$result = array('Materia' => array_values($result));
echo json_encode($result);

Answer 2

In addition to my comment, this would be the code to push all notes to an array as long as the M_DESCRICAO does not change, so the starting array $lista needs to be ordered first. Is this what you were after (code is not tested, office computer :-))?
$notas = $materia = null;
$result = $tmp = array();
$len = count($lista);
for ($i=0;$i<$len;$i++) {
$notas = array();
$materia = $lista[$i]["M_DESCRICAO"];
while (($materia == $lista[$i+1]["M_DESCRICAO"]) && ($i < ($len -1))) {
$notas[$lista[$i]["PE_DESCRICAO"]] = $lista[$i]["NT_NOTAFINAL"];
$i++;
}
// now $notas holds all corresponding entries
$tmp[] = array("Descricao"=>$materia, "Notas" => $notas);
}
$result = array("Materia"=>array($tmp));
echo json_encode($result);

Answer 3

I worked out an untested (there might be some errors, but logically it should work) piece of code, but it might help you:
$notas;
$materia = '';
$materia_array;
foreach($lista as $value){
if($materia == '')
$materia = $value["M_DESCRICAO"];
if($value["M_DESCRICAO"] != $materia){
array_push($materia_array, (array("Descricao"=>$materia,"Notas"=>$notas));
unset($notas); //<--------
$notas = array();//<--------
$materia = $value["M_DESCRICAO"];
}
else
{
array_push($notas, array($value["PE_DESCRICAO"]=>$value["NT_NOTAFINAL"]))
}
}
$result = array("Materia"=>$materia_array);
echo json_encode($result);
This should work for multiple M_DESCRICAO values