php - Correct use of equals syntax -

php - Correct use of equals syntax -

could please help me next code

if ($scope = '9001') $docref = $rs["9001ref"]; elseif ($scope = '14001') $docref = $rs["14001ref"]; elseif ($scope = '18001') $docref = $rs["18001ref"]; elseif ($scope = '9001,14001') $docref = $rs["914001ref"]; elseif ($scope = '9001,18001') $docref = $rs["918001ref"]; elseif ($scope = '14001,18001') $docref = $rs["1418001ref"]; elseif ($scope = '9001,14001,18001') $docref = $rs["91418001ref"];

i unsure if should using = or ==

and unsure if should using ' ' or " "

could please allow me know , provide brief explanation know going forward, give thanks you.

in comparing single = means assigning value variable. e.g. $scope = '14001' assign 14001 $scope. compare something, utilize == (just if values same) or === (if values , types match). using ' versus " code style matter. if using variables in string, " parse string check if there variable inside, while ' ignore variable within string. e.g.:

$scope = '123'; echo "my scope {$scope}"; // echo "my scope 123"; echo 'my scope {$scope}'; // echo "my scope {$scope}";

also can utilize variable starts $ in " wrapped string:

echo "variable {$variable}"; echo "string {$row['somekey']}"; echo "object {$this->variable}"; echo "object method returns value {$this->getvalue()}";

php comparison