function to get Image info

function imageInfo($file = null, $out = null) {

// If $file is not supplied or is not a file, warn the user and return false.
if (is_null($file) || !is_file($file)) {
echo '

Warning: image_info() => first argument must be a file.

';
return false;
}

// Defines the keys we want instead of 0, 1, 2, 3, 'bits', 'channels', and 'mime'.
$redefine_keys = array(
'width',
'height',
'type',
'attr',
'bits',
'channels',
'mime',
);

// If $out is supplied, but is not a valid key, nullify it.
if (!is_null($out) && !in_array($out, $redefine_keys)) $out = null;

// Assign usefull values for the third index.
$types = array(
1 => 'GIF',
2 => 'JPG',
3 => 'PNG',
4 => 'SWF',
5 => 'PSD',
6 => 'BMP',
7 => 'TIFF(intel byte order)',
8 => 'TIFF(motorola byte order)',
9 => 'JPC',
10 => 'JP2',
11 => 'JPX',
12 => 'JB2',
13 => 'SWC',
14 => 'IFF',
15 => 'WBMP',
16 => 'XBM'
);
$temp = array();
$data = array();

// Get the image info using getimagesize().
// If $temp fails to populate, warn the user and return false.
if (!$temp = getimagesize($file)) {
echo '

Warning: image_info() => first argument must be an image.

';
return false;
}

// Get the values returned by getimagesize()
$temp = array_values($temp);

// Make an array using values from $redefine_keys as keys and values from $temp as values.
foreach ($temp AS $k => $v) {
$data[$redefine_keys[$k]] = $v;
}

// Make 'type' usefull.
$data['type'] = $types[$data['type']];

// Return the desired information.
return !is_null($out) ? $data[$out] : $data;
}