我有一个数组，想要在特定日期最有效地读取NAV值。如何在PHP代码中做到这一点？我的数组如下：
{"meta": {"fund_house": "xyz", "scheme_type": "Open Ended Schemes", "scheme_category": "Equity Scheme - Large & Mid Cap Fund", "scheme_code": 100033, "scheme_name": "Aditya Birla Sun Life Equity Advantage Fund - Regular Growth"}, "data": [{"date": "24-05-2019", "nav": "409.32000"}, {"date": "23-05-2019", "nav": "403.16000"}, {"date": "22-05-2019", "nav": "403.65000"}, {"date": "21-05-2019", "nav": "403.28000"}, {"date": "20-05-2019", "nav": "406.48000"}, {"date": "17-05-2019", "nav": "392.47000"}, {"date": "16-05-2019", "nav": "387.90000"}, {"date": "15-05-2019", "nav": "385.47000"}, {"date": "14-05-2019", "nav": "386.88000"}