head.php

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<?php
echo elgg_format_element('title', [], (string) elgg_extract('title', $vars), ['encode_text' => true]);

$metas = elgg_extract('metas', $vars, []);
foreach ($metas as $attributes) {
    echo elgg_format_element('meta', $attributes);
}

$links = elgg_extract('links', $vars, []);
foreach ($links as $attributes) {
    echo elgg_format_element('link', $attributes);
}

$js_foot = elgg_get_loaded_external_resources('js', 'footer');
foreach ($js_foot as $resource) {
    $options = [
        'rel' => 'preload',
        'as' => 'script',
        'href' => $resource->url,
    ];
    
    if (!empty($resource->integrity)) {
        $options['integrity'] = $resource->integrity;
        $options['crossorigin'] = 'anonymous';
    }
    
    echo elgg_format_element('link', $options);
}

$stylesheets = elgg_get_loaded_external_resources('css', 'head');
foreach ($stylesheets as $resource) {
    $options = [
        'rel' => 'stylesheet',
        'href' => $resource->url,
    ];
    
    if (!empty($resource->integrity)) {
        $options['integrity'] = $resource->integrity;
        $options['crossorigin'] = 'anonymous';
    }
    
    echo elgg_format_element('link', $options);
}

$js_head = elgg_get_loaded_external_resources('js', 'head');
foreach ($js_head as $resource) {
    $options = [
        'src' => $resource->url,
    ];
    
    if (!empty($resource->integrity)) {
        $options['integrity'] = $resource->integrity;
        $options['crossorigin'] = 'anonymous';
    }
    
    echo elgg_format_element('script', $options);
}

// A non-empty script *must* come below the CSS links, otherwise Firefox will exhibit FOUC
// See https://github.com/Elgg/Elgg/issues/8328
?>
<script>
    <?php // Do not convert this to a regular function declaration. It gets redefined later. ?>
    require = function () {
        // handled in the view "elgg.js"
        _require_queue.push(arguments);
    };
    _require_queue = [];
</script>