Can't use the method return value in write context

Question

I'm using codeigniter and trying to make an if statement for if the controllers have changed. What I have right now gives the error.

if (isset($this->session->userdata('lastUrl')) && $this->session->userdata('lastUrl') != $this->router->class) {
     echo 'new controller';
}

$this->session->set_userdata('lastUrl', $this->router->class);

This code is in the constructor of the controller so it will be run on every page.

Duplicate of http://stackoverflow.com/questions/1075534/cant-use-method-return-value-in-write-context but out of close votes. — Toon Krijthe, Oct 05 '12 at 21:58

score 3 · Answer 1 · answered Sep 15 '12 at 18:40

3

you can check this by method_exists() function

if (method_exists($this->session->userdata('lastUrl')) && $this->session->userdata('lastUrl') != $this->router->class) {
     echo 'new controller';
}

answered Sep 15 '12 at 18:40

NullPoiиteя

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score 2 · Accepted Answer · answered Sep 15 '12 at 18:32

2

isset is a special language construct that can only be used on variables or array keys, not methods. This should have the same functionality:

$this->session->userdata('lastUrl') !== null && ...

answered Sep 15 '12 at 18:32

Explosion Pills

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Can't use the method return value in write context

2 Answers2