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$str_len = strlen('string');
$str_size = $str_len - ($str_len / 8) * 2;
echo 'string size='.number_format(($str_size / 1024),2).'kb';
$str_len = strlen('string');
$str_size = $str_len - ($str_len / 8) * 2;
echo 'string size='.number_format(($str_size / 1024),2).'kb';