获取文件的后缀名。phpinfo

1：
function get_extension($file){
//strrchr  返回  。jpg   substr :1 是从1开始。
 substr(strrchr($file,'.'),1)
}

2：
function get_extension($file){
//strrpos  返回出现的位置。
 substr($file,strrpos($file,'.')+1);
}

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4：

pathinfo() 返回一个关联数组包含有 path 的信息。

包括以下的数组元素：

• [dirname]
• [basename]
• [extension]

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5:

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" alt="" />

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echo出来就是 png