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

Question

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() ?

Answer 1

Glob patterns support character ranges:

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

Answer 2

You could do this

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

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

Answer 3

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

Answer 4

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.

Answer 5

You can write your own case insensitive glob. This is from a personal web library I write:

/** PHP has no case insensitive globbing
 * so we have to build our own.
 *
 * $base will be the initial part of the path which doesn't need case insensitive
 * globbing.
 * Suffix is similar - it will not be made insensitive
 * Make good use of $base and $suffix to keep $pat simple and fast in use.
 */
    function ciGlob($pat, $base = '', $suffix = '')
    {
        $p = $base;
        for($x=0; $x<strlen($pat); $x++)
        {
            $c = substr($pat, $x, 1);
            if( preg_match("/[^A-Za-z]/", $c) )
            {
                $p .= $c;
                continue;
            }
            $a = strtolower($c);
            $b = strtoupper($c);
            $p .= "[{$a}{$b}]";
        }
        $p .= $suffix;
        return glob($p);
    }

Answer 6

I heard about a function that can be used like this: Try if that works for you!

<?php
$pattern = sql_regcase("*.txt");
glob($pattern);
?>

Answer 7

Came to this link for glob with multiple files. Although it doesn't help with OP, it may help others who end up here.

$file_type = 'csv,jpeg,gif,png,jpg';
$i = '0';
foreach(explode(",",$file_type) as $row){
    if ($i == '0') {
        $file_types = $row.','.strtoupper($row);
    } else {
        $file_types .= ','.$row.','.strtoupper($row);
    }
    $i++;
}

$files = glob($dir."*.{".$image_types."}",GLOB_BRACE);

Answer 8

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);

Answer 9

Building on Alex's tip this could help generally:

function glob_files ($d, $e)
{
    $files = preg_grep ("/$e\$/i", glob ("$d/*"));
    sort ($files)
    return $files;
}

where $d is the directory and $e is the extension.

Answer 10

To make it work with all extensions use:

$extension = 'some_extension';
glob('my/dir/*.preg_replace('/(\w)/e', "'['.strtoupper($1).strtolower($1).']'", $extension));