从函数/方法返回多个值

Question

I have a method in my class that I want to return more than one value:

public function lockFields($lockFieldsDBs, $lockValueConstant) {
    if ($lockFieldsDBs == $lockValueConstant) {
        $lockFieldValue = 'readonly="readonly"';
        $lockImage      = 'image_url_goes_here';
    }
    else {
        $lockFieldValue = null;
        $lockImage = null;
    }

    return $lockField;
    return $lockImage;
}


...........


$lockFieldsDBs = 'OK';
$lockValueConstant = 'OK';

$formHandler->lockFields($lockFieldsDBs, $lockValue);

When trying to print out a value like this: echo $lockImage;, I am getting Undefined variable: lockImage.

Why isn't the value being returned?

Answer 1

You can return two or more values from a function with help of the list() language construct:

public function lockFields($lockFieldsDBs, $lockValueConstant) {
    if($lockFieldsDBs == $lockValueConstant){
        $lockFieldValue = 'readonly="readonly"';
        $lockImage = 'image_url_goes_here';
    }
    else {
        $lockFieldValue = null;
        $lockImage = null;
    }

    return [$lockField, $lockImage];
}



list($lockField, $lockImage) = $formHandler->lockFields($lockFieldsDBs, $lockValue);