file.php

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<?php
if (!empty($vars['value'])) {
    echo elgg_format_element('div', [
        'class' => 'elgg-state elgg-state-warning',
    ], elgg_echo('fileexists'));
    
    unset($vars['value']); // the value attribute isn't supported for file inputs
}

$vars['class'] = elgg_extract_class($vars, 'elgg-input-file');

$defaults = [
    'type' => 'file',
];

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

$max_size = elgg_extract('max_size', $vars, true);
unset($vars['max_size']);

if ($max_size !== false) {
    if ($max_size === true) {
        $post_max_size = elgg_get_ini_setting_in_bytes('post_max_size');
        $upload_max_filesize = elgg_get_ini_setting_in_bytes('upload_max_filesize');
        
        $max_size = min($upload_max_filesize, $post_max_size);
    }
    
    $max_size = (int) $max_size;
    
    $vars['data-max-size'] = $max_size;
    $vars['data-max-size-message'] = elgg_echo('upload:error:ini_size') . ' ' . elgg_echo('input:file:upload_limit', [elgg_format_bytes($max_size)]);
    
    elgg_import_esm('input/file');
}

echo elgg_format_element('input', $vars);