为什么要转义呢解决思路
为什么要转义呢
str_replace(''\\,'/',dirname(__FILE__)));
上面中红色部分是转义斜杠，为啥要转呢
------解决思路----------------------
因为\是特殊字符。
------解决思路----------------------
只是为了让它变成一个普通字符，让他失去语言意义
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