PHP instantiate dynamic namespaced class

Question

I have a class that I need to instantiate based on a variable passed from a form. The form either passes the string Product or Sku to my PHP script. The fully qualified class that needs to be instantiated is either:

$obj = new MyNameSpace\Product();

Or

$obj = new MyNameSpace\Sku();

I can't figure out how to properly create this namespace on the fly. I've tried the following:

$obj = new "MyNameSpace\\".$class();

Which throws this error:

PHP Parse error:  syntax error, unexpected '"MyNameSpace\\"' (T_CONSTANT_ENCAPSED_STRING)

I've read other questions and answers that say to escape the slash in order to make it a literal slash, but even that does not seem to be working for me. For example:

$class = "Product";
$string = "MyNameSpace\\".$class;
echo $string;

$string prints as MyNameSpace\\Product instead of MyNameSpace\Product. What am I missing here?

That worked, thank you! Please add that as an answer so I can accept it. — flyingL123
– flyingL123, Commented Jan 25, 2015 at 23:20

mario · Accepted Answer · 2015-01-25 23:22:01Z

1

The new keyword supports only two syntaxes:

new ClassNameLiteral;

or

new $ClassNameString;

So you'll have to assemble your classname with namespace prefix beforehand:

$cn = "ns\\$class";
$obj = new $cn;

answered Jan 25, 2015 at 23:22

mario

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Michael Arenzon · Accepted Answer · 2015-01-25 23:22:17Z

0

Just do the following:

$class_name = 'Namespace\Class';
$instance = new $class_name;

answered Jan 25, 2015 at 23:22

Michael Arenzon

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