button.php

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<?php
if (isset($vars['class'])) {
    $vars['class'] = "elgg-button {$vars['class']}";
} else {
    $vars['class'] = "elgg-button";
}

$defaults = array(
    'type' => 'button',
);

$vars = array_merge($defaults, $vars);

switch ($vars['type']) {
    case 'button':
    case 'reset':
    case 'submit':
    case 'image':
        break;
    default:
        $vars['type'] = 'button';
        break;
}

// blank src if trying to access an offsite image. @todo why?
if (isset($vars['src']) && strpos($vars['src'], elgg_get_site_url()) === false) {
    $vars['src'] = "";
}
?>
<input <?php echo elgg_format_attributes($vars); ?> />