// 获取原始字符串 $jsonString = '[{"index":0,"url":"/uploads/20210515/77224f5334636205c823f9ff455c848f.xlsx"},{"index":1,"url":"/uploads/20210515/aa85a3e19c174d7bb0ed8be23ad535e6.jpg"},{"index":2,"url":"/uploads/20210515/83f6ab0c5710c32966962d3e71d0c2e3.doc"}]';  // 1. 使用 unserialize() 函数将字符串转换为数组 $array = unserialize($jsonString);  // 2. 遍历数组并按索引值将元素分配到三个不同的数组中 $urlArray = []; $indexArray = []; $miscArray = [];  foreach ($array as $element) {     switch ($element['index']) {         case 0:             $urlArray[] = $element['url'];             break;         case 1:             $indexArray[] = $element['index'];             break;         default:             $miscArray[] = $element;     } }  // 3. 输出三个数组 var_dump($urlArray); var_dump($indexArray); var_dump($miscArray);