Answers for "remove all array exceot one value php"

php delete array item by value

$colors = array("blue","green","red");

//delete element in array by value "green"
if (($key = array_search("green", $colors)) !== false) {
    unset($colors[$key]);
}

php remove empty values from array

$array = array_filter($array, function($a) {
    return trim($a) !== "";
});