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                為什么php7性能提升了兩倍 1.變量存儲字節減小,減少內存占用,提升變量操作速度 2.改善數組結構 3.改進了函數的調用機制 增加了結合比較運算符 (<=>) 增加了標量類型聲明、返回類型聲明 try...catch 增加多條件判斷,更多 Error 錯誤可以進行異常處理
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