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<?php
$input = '[IMG l="image.jpg" t="Картинка для баннера" d="Скрытое описание"]';
$result = preg_replace(
'!\[IMG l="(.*?)" t="(.*?)" d="(.*?)"\]!si',
'<img src="$1" alt="$2" data="$3" />',
$input
);
var_dump($result);