tags.php

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

$defaults = array(
    'value' => '',
    'disabled' => false,
    'autocapitalize' => 'off',
    'type' => 'text'
);

if (isset($vars['entity'])) {
    $defaults['value'] = $vars['entity']->tags;
    unset($vars['entity']);
}

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

if (is_array($vars['value'])) {
    $tags = array();

    foreach ($vars['value'] as $tag) {
        if (is_string($tag)) {
            $tags[] = $tag;
        } else {
            $tags[] = $tag->value;
        }
    }

    $vars['value'] = implode(", ", $tags);
}

echo elgg_format_element('input', $vars);