S
$query="SELECT id FROM otfi WHERE brand='{$brand}' GROUP by 1";
PHP может в шаблонные литералы

Size: a a a
S
$query="SELECT id FROM otfi WHERE brand='{$brand}' GROUP by 1";
N
$query="SELECT id FROM otfi WHERE brand='{$brand}' GROUP by 1";
DE
DE
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DE
У
У