原来的字符串

{"0":{"url":"/uploads/admin/202207/62dfe1e4e8de7.png","title":""},"1":{"url":"/uploads/admin/202207/62dfe1e474684.png","title":""},"2":{"url":"/uploads/admin/202207/62dfe1e3e3f8d.png","title":""},"3":{"url":"/uploads/admin/202207/62dfe1e3b5d3a.png","title":""},"4":{"url":"/uploads/admin/202207/62dfe1e377cfc.png","title":""}}

要求变成数组。

从字符中可以看出是转义过的符号。

所以先转义：

htmlspecialchars_decode

然后变成了JSON。再把JSON转换成数组。

 <?php
 echo $i["piclist"];
print_r( json_decode(htmlspecialchars_decode($i["piclist"]),true)); 

exit;

 ?>