Can PHP's glob() be made to find files in a case insensitive manner?

I want all CSV files in a directory, so I use

glob('my/dir/*.CSV')

This however doesn't find files with a lowercase CSV extension.

I could use

glob('my/dir/*.{CSV,csv}', GLOB_BRACE);

But is there a way to allow all mixed case versions? Or is this just a limitation of glob() ?

Glob patterns support character ranges:

glob('my/dir/*.[cC][sS][vV]')

You could do this

$files = glob('my/dir/*');

$csvFiles =  preg_grep('/\.csv$/i', $files);

glob('my/dir/*.[cC][sS][vV]') should do it. Yeah it's kind of ugly.

You can also filter out the files after selecting all of them

foreach(glob('my/dir/*') as $file){
    $ext = strtolower(pathinfo($file, PATHINFO_EXTENSION));
    if(!in_array($ext, array('csv'))){
        continue;
    }
    ... do stuff ...
}

performance wise this might not be the best option if for example you have 1 million files that are not csv in the folder.

This code works for me to get images only and case insensitive.

imgage list:

• image1.Jpg
• image2.JPG
• image3.jpg
• image4.GIF

$imageOnly = '*.{[jJ][pP][gG],[jJ][pP][eE][gG],[pP][nN][gG],[gG][iI][fF]}';
$arr_files = (array) glob($path . $imageOnly, GLOB_BRACE);

Perhaps it looks ugly but you only have to declare the $imageOnly once and can use it where needed. You can also declare $jpgOnly etc.

I even made a function to create this pattern.

/*--------------------------------------------------------------------------
 * create case insensitive patterns for glob or simular functions
 * ['jpg','gif'] as input
 * converted to: *.{[Jj][Pp][Gg],[Gg][Ii][Ff]}
 */
function globCaseInsensitivePattern($arr_extensions = []) {
   $opbouw = '';
   $comma = '';
   foreach ($arr_extensions as $ext) {
       $opbouw .= $comma;
       $comma = ',';
       foreach (str_split($ext) as $letter) {
           $opbouw .= '[' . strtoupper($letter) . strtolower($letter) . ']';
       }
   }
   if ($opbouw) {
       return '*.{' . $opbouw . '}';
   }
   // if no pattern given show all
   return '*';
} // end function

$arr_extensions = [
        'jpg',
        'jpeg',
        'png',
        'gif',
    ];
$imageOnly = globCaseInsensitivePattern($arr_extensions);
$arr_files = (array) glob($path . $imageOnly, GLOB_BRACE);