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<?php class class1 { protected $prop; public function __construct($prop) { $this->prop = $prop; } public function getThing($arg) { assert('$arg->isValid();'); $this->prop->method(); } } class class2 { public function method() { echo "here\n"; } } class class3 { public function isValid() { return false; } } $tmp = new class1(new class2()); $tmp->getThing(new class3());
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