how to get loop JSON value amount with random value array use PHP

{
  "success": 1,
  "return": {
    "1400151861513776": {
      "pair": "edc_btc",
      "type": "buy",
      "amount": 138959.22155687,
      "rate": 0.00000085,
      "timestamp_created": "1556464987",
      "status": 0
    },
    "1400151861456538": {
      "pair": "edc_btc",
      "type": "buy",
      "amount": 4115.53246448,
      "rate": 0.00000085,
      "timestamp_created": "1556463520",
      "status": 0
    },
    "1400151861402138": {
      "pair": "edc_btc",
      "type": "buy",
      "amount": 252.29423504,
      "rate": 0.00000085,
      "timestamp_created": "1556462106",
      "status": 0
    },
    "1400151861205651": {
      "pair": "edc_btc",
      "type": "buy",
      "amount": 5735.02289537,
      "rate": 0.00000085,
      "timestamp_created": "1556457111",
      "status": 0
    },
    "1400151861064946": {
      "pair": "edc_btc",
      "type": "buy",
      "amount": 608.2294235,
      "rate": 0.00000085,
      "timestamp_created": "1556453555",
      "status": 0
    },
    "1400151860984352": {
      "pair": "edc_btc",
      "type": "buy",
      "amount": 13553.51532229,
      "rate": 0.00000085,
      "timestamp_created": "1556451515",
      "status": 0
    },
    "1400151860967764": {
      "pair": "edc_btc",
      "type": "buy",
      "amount": 49475.62404601,
      "rate": 0.00000085,
      "timestamp_created": "1556451103",
      "status": 0
    },
    "1400151860901030": {
      "pair": "edc_btc",
      "type": "buy",
      "amount": 21474.82564282,
      "rate": 0.00000085,
      "timestamp_created": "1556449399",
      "status": 0
    },
    "1400151860889146": {
      "pair": "edc_btc",
      "type": "buy",
      "amount": 2657.50733826,
      "rate": 0.00000085,
      "timestamp_created": "1556449090",
      "status": 0
    },
    "1400151860484795": {
      "pair": "edc_btc",
      "type": "buy",
      "amount": 71933.21911691,
      "rate": 0.00000085,
      "timestamp_created": "1556438570",
      "status": 0
    },
    "2400151859280443": {
      "pair": "edc_btc",
      "type": "sell",
      "amount": 266054.68380596,
      "rate": 0.00000088,
      "timestamp_created": "1556408217",
      "status": 0
    },
    "2400151857916444": {
      "pair": "edc_btc",
      "type": "sell",
      "amount": 400000,
      "rate": 0.0000009,
      "timestamp_created": "1556374931",
      "status": 0
    },
    "2400151857916059": {
      "pair": "edc_btc",
      "type": "sell",
      "amount": 400000,
      "rate": 0.00000089,
      "timestamp_created": "1556374923",
      "status": 0
    }
  }
}

how to get loop value amount..this array has random value 1400151861513776..change everytime..

i use php code.. json_decode..