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[CODE=php]

            preg_match_all('/\[gposter=left\](.*?)\[\/gposter\]/i', $row['post_text'], $poster6, PREG_SET_ORDER);

            preg_match_all('/\[gposter\](.*?)\[\/gposter\]/i', $row['post_text'], $poster5, PREG_SET_ORDER);

            preg_match_all('/\[poster\](.*?)\[\/poster\]/i', $row['post_text'], $poster4, PREG_SET_ORDER);

            preg_match_all('/\[img=right\](.*?)\[\/img\]/i', $row['post_text'], $poster3, PREG_SET_ORDER);

            preg_match_all('/\[img=left\](.*?)\[\/img\]/i', $row['post_text'], $poster2, PREG_SET_ORDER);

            preg_match_all('/\[img\](.*?)\[\/img\]/i', $row['post_text'], $poster1, PREG_SET_ORDER);

        $url = empty($url) ? 'noposter.png' : '';

        if (isset($poster7[0][1])) $url = $poster7[0][1];

        elseif (isset($poster6[0][1])) $url = $poster6[0][1];

        elseif (isset($poster5[0][1])) $url = $poster5[0][1];

        elseif (isset($poster4[0][1])) $url = $poster4[0][1];

        elseif (isset($poster3[0][1])) $url = $poster3[0][1];

        elseif (isset($poster2[0][1])) $url = $poster2[0][1];

        elseif (isset($poster1[0][1])) $url = $poster1[0][1];

[/CODE]

Эм... Это блин ШО ???

Может как-то так попробовать ?

[CODE=php]

preg_match_all('~\[(g?poster|img)=?(right|left)?\](.*?)\[\/(g?poster|img)\]~siu', $row['post_text'], $poster, PREG_PATTERN_ORDER);

$arry = array_filter($poster[3]);

$url = !empty(reset($arry)) ?? 'noposter.png';

[/CODE]