button.php

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<?php
$vars['class'] = elgg_extract_class($vars, 'elgg-button');

$defaults = ['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'] = "";
}

echo elgg_format_element('input', $vars);