John Didact

RewriteCond %{QUERY_STRING} c=230 [NC]
RewriteCond %{QUERY_STRING} p=content [NC]
RewriteRule .* /art-105.html? [R=301,L]

$old = 'ej_yasen_beliy_601.jpeg';
$new = preg_replace('#^(.*?)_(\d+(?:_\d+)*)(\.[a-z]+)$#is', '$2_$1$3', $old);
if($new == $old){
 print("ничего нового\n");
}else{
 print("было {$old}, стало {$new}\n");
}

SELECT cm.* 
FROM
car_mark mk 
LEFT JOIN car_model ml ON ml.id_car_mark = mk.id_car_mark
WHERE mk.name = 'AC'

SELECT ml.*
FROM car_model ml
WHERE ml.id_car_mark = (
 SELECT mk.id_car_mark
 FROM car_mark mk
 WHERE mk.name = 'AC'
)

foreach($arr AS $obj){
 $obj->name;
}