JSON KEY VALUE LOOP PHP [closed] - php

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i have a JSON with this data:
$data = "meta_data":[
{
"id":2279,
"key":"codice_fiscale",
"value":"gege"
},
{
"id":2280,
"key":"numero_tessera_titolare",
"value":"gre"
},
{
"id":2281,
"key":"classe_tessera_titolare",
"value":"gre"
},
{
"id":2282,
"key":"tratta_da",
"value":"gre"
},
{
"id":2283,
"key":"tratta_a",
"value":"grge"
},
{
"id":2284,
"key":"studente",
"value":"studente"
}];
I need to loop all "key" and when i find the key that i need (in this case "studente") i need to get the value stored in "value".
How can i do this in PHP?
EDIT
I tried this:
foreach($data as $row){
if($row->key=='studente'){
$var = $row->value;
}
}

Answer 1

The best / most efficient way is to write a foreach loop with a break.
Code: (Demo)
$json = '{
"meta_data": [
{
"id": 2279,
"key": "codice_fiscale",
"value": "gege"
},
{
"id": 2283,
"key": "tratta_a",
"value": "grge"
},
{
"id": 2284,
"key": "studente",
"value": "studente"
}
]}';
$data = json_decode($json, true);
$search='studente';
$found=false;
foreach($data['meta_data'] as $d){
if($d['key']==$search){
$found=$d['value'];
break;
}
}
echo $found?$found:"$search not found";
Output:
studente

Answer 2

First, $data is not a valid json. You can use json_decode() to get a php array representation of your json string. Then loop through array.
Example:
$json = '{
"meta_data": [
{
"id": 2279,
"key": "codice_fiscale",
"value": "gege"
},
// other items...
{
"id": 2283,
"key": "tratta_a",
"value": "grge"
},
{
"id": 2284,
"key": "studente",
"value": "studente"
}
]}';
$data = json_decode($json, true);
//var_dump($data);
foreach($data['meta_data'] as $key => $item) {
if (isset($item['value']) && $item['value'] == 'studente') {
var_dump($item);
}
}