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                針對數字進行的算術計算,包括:+ - * / % %:對整數數字進行“取余操作”——如果不是整數,會先自動轉換為整數之后再進行取余。 轉換為整數的做法是:直接去掉小數部分 比如: ``` $v1 = 10 % 4; //結果為2 $v2 = 10.8 % 3.6 //結果為1 ``` 如果不是數字,會自動轉換為數字進行。 舉例: ``` $v1 = 3 + “4”; //7 $v2 = “3” + “4”; //7 $v3 = “3” + “4.5”; //7.5 $v4 = 3 + “4abcd”; //7 $v5 = “3ab” + “4cd”; //7 $v6 = 3 + “abc4”; //3 $v7 = “ab3” + “cd4”; // 0 $v8 = “ab” + “cd”; //0 $v9 = 3 + true; //4 true轉為數字,為1 $v10 = 3 + false; //3 false轉為數字,為0 ``` 演示: ![](https://img.kancloud.cn/07/64/0764216bd53bd497cadf949eb312c55a_499x168.png)
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