專案筆記:PHP 的註解符號:單行註解「//」與多行註解「/*..*/」

常看到的註解符號有「//」與「/*..*/」

註解就是指程式的說明文字,方便於了解程式的結構與偵錯,程式編譯時,註解文字與註解符號本身都不會被執行。PHP 的註解符號有兩種,單行註解與多行註解:

單行註解:「//」

在「//(兩個左斜線)」之後的文字皆會被視為註解文字而不執行,其勢力範圍僅在一行有效,例如:
[
echo sqrt($X); //輸出答案9 ]
在「//」之後的「輸出答案9」就是註解文字,而「//」則稱為註解符號。

多行註解:「/*..*/」

既然是多行註解,那麼其勢力範圍就不僅在一行有效,正因為如此,多行註解就有起始符號「/*」與終止符號「*/」,在起始符號「/*」與終止符號「*/」之間的文字皆會被視為註解文字而不執行,例如:
[ /* 利用sqrt函數
印出變數的方根值 */
$X=81;
echo sqrt($X);
]

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陳銘淦攝影集(阿淦正撰): 專案筆記:PHP 的註解符號:單行註解「//」與多行註解「/*..*/」
專案筆記:PHP 的註解符號:單行註解「//」與多行註解「/*..*/」
陳銘淦攝影集(阿淦正撰)
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