php：循环遍历json数组

Question

我有一个json数组：

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

如何使用php循环遍历此数组？

Answer 1

如果需要关联数组，请将第二个函数参数设置为true

如果需要关联数组，某些版本的php需要第二个参数true

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

Answer 2

使用json_decode()解码JSON字符串，然后使用常规循环遍历它：

$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
}

Answer 3

首先你必须解码你的json：

$array = json_decode($the_json_code);

然后在json解码后你必须做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 ...
    }
}

如果你想要一些特定的东西，只需要这样的钥匙。把它放在最后一个foreach之间。

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

Answer 4

使用json_decode将JSON字符串转换为PHP数组，然后在其上使用普通的PHP数组函数。

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

var_dump($data[0]['var1']); // outputs '9'