使用PHP循环嵌套的JSON数组

You can decode data and loop it

     $s = '[
{
    "custClass": [
        {
            "code": "50824109d3b1947c9d9390ac5caae0ef",
            "desc": "e1f96b98047adbc39f8baf8f4aa36f41"
        },
        {
            "code": "dab6cc0ed3688f96333d91fd979c5f74",
            "desc": "d0e850f728b2febee79e1e7d1186c126"
        },
        {
            "code": "bc4050f8f891296528ad6a292b615e86",
            "desc": "bee3120e77092d889c3b9e27cbee75bd"
        },
        {
            "code": "f13fc8c35dfe206a641207c6054dd9a0",
            "desc": "32a81cb610805d9255d5f11354177414"
        },
        {
            "code": "2117c346d9b3dfebf18acc8b022326d4",
            "desc": "88a8e85db11976082fed831c4c83838e"
        },
        {
            "code": "95c0674fc0e0434f52a60afce74571d2",
            "desc": "39c4d4bca1578194801f44339998e382"
        },
        {
            "code": "c8ad6f709612d2a91bb9f14c16798338",
            "desc": "6b4c4d5f4ae609742c1b6e62e16f8650"
        }
    ],
    "sourceData": [
        {
            "sourceId": "ff64060a40fc629abf24eb03a863fd55",
            "sourceName": "92aa69979215a2bf6290c9a312c5891f"
        }
    ]
}
]';
$data =json_decode($s,true);
foreach($data as  $obj){
    foreach($obj['custClass'] as $val){ 
        echo "Desc ".$val['desc']."<br/>";
    }
}

You can try this way

$json='{
  "custClass": [
    {
      "code": "50824109d3b1947c9d9390ac5caae0ef",
      "desc": "e1f96b98047adbc39f8baf8f4aa36f41"
    },
    {
      "code": "dab6cc0ed3688f96333d91fd979c5f74",
      "desc": "d0e850f728b2febee79e1e7d1186c126"
    },
    {
      "code": "bc4050f8f891296528ad6a292b615e86",
      "desc": "bee3120e77092d889c3b9e27cbee75bd"
    },
    {
      "code": "f13fc8c35dfe206a641207c6054dd9a0",
      "desc": "32a81cb610805d9255d5f11354177414"
    },
    {
      "code": "2117c346d9b3dfebf18acc8b022326d4",
      "desc": "88a8e85db11976082fed831c4c83838e"
    },
    {
      "code": "95c0674fc0e0434f52a60afce74571d2",
      "desc": "39c4d4bca1578194801f44339998e382"
    },
    {
      "code": "c8ad6f709612d2a91bb9f14c16798338",
      "desc": "6b4c4d5f4ae609742c1b6e62e16f8650"
    }
  ],
  "sourceData": [
    {
      "sourceId": "ff64060a40fc629abf24eb03a863fd55",
      "sourceName": "92aa69979215a2bf6290c9a312c5891f"
    }
  ]
}';

        $decode=json_decode($json,true);
        $desc=[];

        foreach($decode['custClass'] as $cust){
              $desc[]=$cust['desc'];
        }        
        var_dump($desc);

Try decoding data and retrieve it using foreach:

$your_data = your_data;

$decoded_data = json_decode($your_data [0], true);
$final_data = [];
foreach($decoded_data['custClass'] as $data) {
$final_data[] = $data['desc'];
}

print_r($final_data);

try this code

loop this array like below

foreach(json_decode($data) as $key=>$value){
        foreach($value->custClass as $key1=>$value1){
            echo $value1->desc;
        }
    }

json_decode() the data

<?php
$data= '[
{
"custClass": [
{
"code": "50824109d3b1947c9d9390ac5caae0ef",
"desc": "e1f96b98047adbc39f8baf8f4aa36f41"
},
{
"code": "dab6cc0ed3688f96333d91fd979c5f74",
"desc": "d0e850f728b2febee79e1e7d1186c126"
},
{
"code": "bc4050f8f891296528ad6a292b615e86",
"desc": "bee3120e77092d889c3b9e27cbee75bd"
},
{
"code": "f13fc8c35dfe206a641207c6054dd9a0",
"desc": "32a81cb610805d9255d5f11354177414"
},
{
"code": "2117c346d9b3dfebf18acc8b022326d4",
"desc": "88a8e85db11976082fed831c4c83838e"
},
{
"code": "95c0674fc0e0434f52a60afce74571d2",
"desc": "39c4d4bca1578194801f44339998e382"
},
{
"code": "c8ad6f709612d2a91bb9f14c16798338",
"desc": "6b4c4d5f4ae609742c1b6e62e16f8650"
}
],
"sourceData": [
{
"sourceId": "ff64060a40fc629abf24eb03a863fd55",
"sourceName": "92aa69979215a2bf6290c9a312c5891f"
}
]
}
]';
foreach(json_decode($data) as $key=>$value){
    foreach($value->custClass as $key1=>$value1){
        echo $value1->desc;
    }
}
?>