我有一個看起來像這樣的數組：[   {    "positional_index":"1.3",    "sourceid":10409,    "language": "Malayalam",    "field_gita_10409_text": "Behold, O Teacher! this mighty army of the sons of Pandu, arrayed by the son of Drupada, thy wise disciple."   },   {    "positional_index":"1.2",    "sourceid":10409,    "language": "Devanagari",    "field_gita_10409_text": "1.1 Dhritarashtra said What did my people and the sons of Pandu do when they had assembled together eager for battle on the holy plain of Kurukshetra, O Sanjaya."   },]我應該使用 foreach 循環來訪問每個鍵。例如，如果 key = field_gita_10409_text，我必須使用 php 中的 explode() 函數來提取值 10409 等。在這種情況下，我不知道如何使用 foreach 循環，因為該數組包含 2 個關聯數組。請告訴我。