php: loop through json array

Question

I have a json array:

[
 {
 "var1": "9",
 "var2": "16",
 "var3": "16"
 },
 {
 "var1": "8",
 "var2": "15",
 "var3": "15"
 }
]

How can I loop through this array using php?

• Phil: Use json_decode to convert it to a PHP array.

Answer 1

Decode the JSON string using json_decode() and then loop through it using a regular loop:

$arr = json_decode('[{"var1":"9","var2":"16","var3":"16"},{"var1":"8","var2":"15","var3":"15"}]');
foreach($arr as $item) { //foreach element in $arr
 $uses = $item['var1']; //etc
}

• superUntitled: +1 for this. it is exactly what I was trying to do, however the lack of the true for the associative array was giving me an error.

Answer 2

Set the second function parameter to true if you require an associative array

(削除) Some versions of php require a 2nd paramter of true if you require an associative array (削除ここまで)

$json = '[{"var1":"9","var2":"16","var3":"16"},{"var1":"8","var2":"15","var3":"15"}]';
$array = json_decode( $json, true );

• Phil: There's no version specific reference to the second assoc argument

Answer 3

First you have to decode your json :

$array = json_decode($the_json_code);

Then after the json decoded you have to do the foreach

foreach ($array as $key => $jsons) { // This will search in the 2 jsons
 foreach($jsons as $key => $value) {
 echo $value; // This will show jsut the value f each key like "var1" will print 9
 // And then goes print 16,16,8 ...
 }
}

If you want something specific just ask for a key like this. Put this between the last foreach.

if($key == 'var1'){
 echo $value;
}

Answer 4

Use json_decode to convert the JSON string to a PHP array, then use normal PHP array functions on it.

$json = '[{"var1":"9","var2":"16","var3":"16"},{"var1":"8","var2":"15","var3":"15"}]';
$data = json_decode($json);
var_dump($data[0]['var1']); // outputs '9'

• Kahn Kah: This doesn't loop through the array tho. It just retrieves the first value?