How can PHP developers differentiate variable types within a while loop?

PHP developers can differentiate variable types within a while loop by using the `gettype()` function to check the type of each variable before performing any operations on them. This allows developers to handle different types of variables appropriately within the loop. 

$variables = [1, "two", 3.0, true];

$i = 0;
while ($i < count($variables)) {
    $currentVariable = $variables[$i];
    
    if (gettype($currentVariable) === "integer") {
        echo "Integer: $currentVariable\n";
    } elseif (gettype($currentVariable) === "string") {
        echo "String: $currentVariable\n";
    } elseif (gettype($currentVariable) === "double") {
        echo "Double: $currentVariable\n";
    } elseif (gettype($currentVariable) === "boolean") {
        echo "Boolean: $currentVariable\n";
    } else {
        echo "Unknown type: $currentVariable\n";
    }
    
    $i++;
}

Keywords

PHP variable types while loop type checking type conversion

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