php转复杂json

$str = '{"img":"https://cbu01.alicdn.com/img/ibank/2019/058/628/11719826850_1192174922.360x360.jpg","img_dir":"C:/1688/淘货源/ 数码产品/600437863750/紫色/1.jpg","mold":"紫色","specs":"23.5*9*16.5cm","price":"15.30","vendibility":"11029"}{"img":"https://cbu01.alicdn.com/img/ibank/2019/058/628/11719826850_1192174922.360x360.jpg","img_dir":"C:/1688/淘货源/数码产品/600437863750/黑色/1.jpg","mold":"黑色","specs":"23.5*9*16.5cm","price":"15.30","vendibility":"11560"}{"img":"https://cbu01.alicdn.com/img/ibank/2019/861/899/11687998168_1192174922.400x400.jpg","img_dir":"C:/1688/淘货源/数码产品/600437863750/灰色/1.jpg","mold":"灰色","specs":"23.5*9*16.5cm","price":"15.30","vendibility":"11545"}{"img":"https://cbu01.alicdn.com/img/ibank/2019/826/736/11651637628_1192174922.400x400.jpg","img_dir":"C:/1688/淘货源/数码产品/600437863750/酒红色/1.jpg","mold":"酒红色","specs":"23.5*9*16.5cm","price":"15.30","vendibility":"11358"}{"img":"https://cbu01.alicdn.com/img/ibank/2019/423/599/11687995324_1192174922.400x400.jpg","img_dir":"C:/1688/淘货源/数码产品/600437863750/藏青/1.jpg","mold":"藏青","specs":"23.5*9*16.5cm","price":"15.30","vendibility":"11080"}';

$json = json_decode('[' . preg_replace('/}s*{/', '},{', $str) . ']');