PHP类似java 有三种注释风格，但它的注释必须放到“?>” 结束符号前才有效，否则就属于HTML注释了。
?
- 多行注释
/*
?content......
*/ - 单行注释
// content - Shell 脚本风格
# content
PHP诠释风格及规则
content
html
java
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PHP注释风格及规则
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