用php在json中搜索和替换

<?php
function searchAndReplace($json, $searchValue, $replaceValue) {
    foreach ($json as $key => $value) {
        if (is_array($value) || is_object($value)) {
            $json->$key = searchAndReplace($value, $searchValue, $replaceValue);
        } elseif ($value === $searchValue) {
            $json->$key = $replaceValue;
        }
    }
    return $json;
}

$jsonString = '{"name": "John", "age": 30, "city": "New York"}';
$searchValue = "New York";
$replaceValue = "London";

$json = json_decode($jsonString);

$result = searchAndReplace($json, $searchValue, $replaceValue);

$resultString = json_encode($result);
echo $resultString;
?>

{"name":"John","age":30,"city":"London"}