Sintax is correct? Php to Twig

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<?php $flip .= '"'.$rthumb['flipimage'].'",' ?>
<?php $flipimages = rtrim($flip,','); ?>

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{{ flip ~= '"'~rthumb.flipimage~'",' }}
{{ flipimages = flip|rtrim(',') }}

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$flipimages = rtrim($flip,',')

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$data['flipimages'] = $flipimages;

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$data['flipimages'] =  rtrim($flip,',');

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{{ flipimages }}

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$flip .= '"'.$rthumb['flipimage'].'",'

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$rthumb = array();

$rthumb[] = array(
	'id' => 1,
	'flipimage' => 'image1.jpg'
	);
$rthumb[] = array(
	'id' => 2,
	'flipimage' => 'image2.jpg'
	);
$rthumb[] = array(
	'id' => 3,
	'flipimage' => 'image3.jpg'
	);
$rthumb[] = array(
	'id' => 4,
	'flipimage' => 'image4.jpg'
	);

$flip = '';

foreach ($rthumb as $image) {
	$flip .= $image['flipimage'].',';
}

echo 'flip = ' . $flip . '<br />';

$flipimages = rtrim($flip,',');

echo 'trimmed flip = ' . $flipimages;

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{% set rthumb = [
    {'id':'1','flipimage':'image1.jpg'}, 
    {'id':'2','flipimage':'image2.jpg'}, 
    {'id':'3','flipimage':'image3.jpg'}, 
    {'id':'4','flipimage':'image4.jpg'}
] %}

{% set flip = '' %}

{% for image in rthumb %}
	{% set flip = flip ~ image.flipimage ~ ',' %}
{% endfor %}

flip = {{ flip }}
<br />

{% set flipimages = flip|trim(',') %}

trimmed flipimages = {{ flipimages }}