PHP检查文件是否存在于任何目录中

Question

How to check if a file doesn't exist in any directory, add into the $notexists array.

foreach($files as $file){
   foreach ($folders as $this_folder) {
     if (file_exists($this_folder.$file)) {
        $exists[] =$file;
        continue;
     }else{
         // What to do if file is not exist in any directory, add into array.
         $notexists[] = '';
    }
}

Answer 1

You need to wait until the end of the loop to know if the file was not found in any of the directories.

And continue; should be break;. continue restarts starts the next iteration of the current loop, but once you find the file you want to exit the loop completely.

foreach($files as $file){
    $found = false;
    foreach ($folders as $this_folder) {
        if (file_exists($this_folder.$file)) {
            $exists[] =$file;
            $found = true;
            break;
        }
    }
    if (!$found) {
        // What to do if file is not exist in any directory, add into array.
        $notexists[] = $file;
    }
}