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                算數運算符,就是大家小學所學絕大多數知識: | 符號 | 說明 | 舉例 | | -- | -- | -- | | + | 加號 | $x + $y | | - | 減號 | $x - $y | | * | 乘號,乘以 | $x * $y | | / | 除號,除以 | $x / $y | | % | 取余也叫取模、求模 | $x % $y | ~~~ <?php $x = 5; $y = 6; //5+6為11 echo $x + $y; ?> ~~~ ~~~ <?php $x = 20; $y = 15; //20 -15 為5 echo $x - $y; ?> ~~~ ~~~ <?php $x = 20; $y = 15; //20乘以15結果為300 echo $x * $y; ?> ~~~ ~~~ <?php $x = 10; $y = 5; //10除以5 結果為2 echo $x / $y; ?> ~~~ ~~~ <?php $x = 10; $y = 3; //$x 不能整除3,得到的余數為1,所以結果輸出為1 echo $x % $y; ?> ~~~ * * * * * 與我們數學所學一樣,也有優先級:先乘除,后加減。如果你想更明確的改變優先級,那就用()【小括號】,將想要優先的運算給括起來。
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