Drupal 7 Module Development

Working with Files and Images
/**
* Overrides getExternalUrl().
*
* Return the HTML URL of a Twitpic image.
*/
function getExternalUrl() {
// Get image_id and size from the URI into an array.
$target = file_uri_target($this->uri);
$options = array_combine(
array('image_id', 'size'),
explode('/', $target)
);
// If no size is specified, default to thumb.
if (empty($options['size'])) {
$options['size'] = 'thumb';
}
// Create the URL
$url = 'http://twitpic.com/show/' . $options['size'] . '/' .
$options['image_id'];
return $url;
}
/**
* Support for fopen(), file_get_contents(),etc.
*/
public function stream_open($uri, $mode, $options, &$opened_path) {
$allowed_modes = array('r', 'rb');
if (!in_array($mode, $allowed_modes)) {
return FALSE;
}
$this->uri = $uri;
$url = $this->getExternalUrl();
$this->handle = ($options & STREAM_REPORT_ERRORS) ? fopen($url,
$mode) : @fopen($url, $mode);
return (bool)$this->handle;
}
}
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