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<?php
$test_json = file_get_contents('/tmp/test_json');
$byte_array = json_decode($test_json, true);
$byte_string = implode(array_map("chr", $byte_array['fieldInfo']['image']));

$img_string = base64_encode($byte_string);

echo '<img src="data:image/jpg;base64,'.$img_string.'"/>';