crop.php

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<?php
$entity = elgg_extract('entity', $vars);
if (!$entity instanceof \ElggUser) {
    return;
}

elgg_load_js('jquery.imgareaselect');
elgg_load_js('elgg.avatar_cropper');
elgg_load_css('jquery.imgareaselect');

echo elgg_view('output/img', [
    'src' => $entity->getIconUrl('master'),
    'alt' => elgg_echo('avatar'),
    'class' => 'mrl',
    'id' => 'user-avatar-cropper',
    'width' => '550',
]);

$coords = ['x1', 'x2', 'y1', 'y2'];
foreach ($coords as $coord) {
    echo elgg_view_field([
        '#type' => 'hidden',
        'name' => $coord,
        'value' => $entity->$coord,
    ]);
}

echo elgg_view_field([
    '#type' => 'hidden',
    'name' => 'guid',
    'value' => $entity->guid,
]);


$footer = elgg_view_field([
    '#type' => 'submit',
    'value' => elgg_echo('avatar:create'),
]);

elgg_set_form_footer($footer);