Error handling opendir

I always get a warming when I tried to use the opendir() but the folder does not exists. How can I handle this error, and verify if the folder exi开发者_开发知识库sts before open the directory?

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is_dir($directory)

Returns TRUE if the filename exists and is a directory, FALSE otherwise.

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You can check if the directory exists with is_dir()

if(is_dir($dir)){
    // code
}