PHP unexpected return value

Question

I am using a class from somebody else and are getting an unexpected result. I already have an idea how to work around it, but I would like to understand why this happens.

class Pay {
  public function checkStatus {
    $check[0] = "000000 OK"
    return $check[0]
  }
}

$status = $cart->checkStatus ();
$payed = ( $status == "000000 OK" ? true : false);

The problem is that $status is somehow 1 when printing (could be also 'true' (have to check later at home)). Also payed is set to 'true' while I expect 'false' because of the wrong value of $status. Hope somebody can explain to me what is happening.

q0re · Accepted Answer · 2015-03-09 07:59:50Z

4

Try this:

$payed = ( $status === "000000 OK" ? true : false);

=== operator checks if $status and your string are equal and from the same type (string). More information you can find here: http://php.net/manual/en/language.operators.comparison.php

I tested it:

class Pay {
  public function checkStatus() {
    $check[0] = "000000 OK";
    return $check[0];
  }
}

$cart = new Pay();
$status = $cart->checkStatus();
echo $status; // returns "000000 OK"
$payed = ( $status == "000000 OK" ? true : false);
echo $payed; // returns 1
$payed = ( $status === "000000 OK" ? true : false);
echo $payed; // returns 1

If i echo $status it returns 000000 OK as string. I don't know whats your problem.

edited Mar 9, 2015 at 7:59

answered Mar 9, 2015 at 7:37

q0re

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2 Comments

Matthieu Over a year ago

That would then probably solve that $payed is not what I expect, but I still don't understand why $check[0] gets changed from a string to an int or boolean when it gets saved into $status

q0re Over a year ago

updated my answer.. i dont know whats your problem. $status variable returns the string 000000 OK as expected.

Community · Accepted Answer · 2017-05-23 12:17:11Z

3

This happens because of your numeric or boolean value in $status. This causes your bit $status == "000000 OK" to evaluate your string to a numeric value (which is 1), thus resulting in true.

Please see this questions accepted answer for further explaination:

Comparing String to Integer gives strange results

edited May 23, 2017 at 12:17

CommunityBot

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answered Mar 9, 2015 at 7:38

kasoban

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1 Comment

Matthieu Over a year ago

I still don't understand why $check[0] gets changed from a string to an int or boolean when it gets saved into $status

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