CODEWITHSUNDEEP
phpoopclass
thepearson
thepearson

Reputation: 2248

PHP 5.3 Dynamically instantiating a class without setting a variable first

OK, this has been a personal bugbear of mine for quite some time. Say I have a class.

class One {
    public $class = 'Two';
    public $member = 'member';
}

class Two {
    public $member = 'Hey there';

    function __construct() {
        print 'Created';
    }
}

$one = new One();

// case 1: works
$two_class = $one->class;
$two = new $two_class();

// case 2: fails
$two = new {$one->class}();

Is there any way to instantiate a class from a class memeber without first assigning the name to a variable? I die a little inside every time I want to create a class dynamically from a property, and I have to populate a variable first. Can anyone explain to me technically why this doesn't work when:

print $two->{$one->method}

Will happily print 'Hey there'?

Upvotes: 0

Views: 288

Answers (1)

Peter
Peter

Reputation: 16915

$two = new $one->class();

Demo: http://codepad.org/64iCiWn2

But you gonna get big trouble if $one->class() is function - it may be confusing, but same thing will happen if if $two_class become function

Upvotes: 9

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