How to Dynamically Instantiate Classes in PHP without Using eval()?

Instantiating Classes through Dynamic Variables in PHP

Dynamically instantiating classes from variable names can be a valuable technique in PHP. Consider the following scenario:

$var = 'bar';
$bar = new {$var}Class('var for __construct()'); //$bar = new barClass('var for __construct()');

How can you achieve this without resorting to the much-debated eval() function, which you'd rather avoid?

Variable Assignment and Instantiation

The solution lies in creating a variable that holds the class name and then instantiating the class using the $ variable operator:

$classname = $var . 'Class';

$bar = new $classname("xyz");

This technique allows you to dynamically instantiate classes based on variable values, which can prove useful in patterns like the Factory pattern.

Further Considerations

To delve deeper into this topic, refer to PHP's documentation on Namespaces and dynamic language features, which provide more context and examples.

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