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Bug #60672 ELSEIF/ELSE IF doesn't work
Submitted: 2012-01-06 16:11 UTC Modified: 2012-01-09 15:13 UTC
From: danillo dot paiva dot toledo at gmail dot com Assigned:
Status: Not a bug Package: Variables related
PHP Version: Irrelevant OS: Windows XP
Private report: No CVE-ID: None
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From: danillo dot paiva dot toledo at gmail dot com
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 [2012-01-06 16:11 UTC] danillo dot paiva dot toledo at gmail dot com 
Description:
------------
$x = 0;
$y = "some_string";

if( $x == 2 ) {
	echo "X = 2.<br/>";
	echo "Inner first IF";
} elseif ( $x == $y ) {
	echo "We are at the elseif condition.";
} else {
	echo "I don't know what's X value.";
}

Test script:
---------------
1st - That's my first time using bug report on php.net.
2nd - I'm brazilia(sorry my english).
3rd - I don't know I'm using the correct channel to report this.

I used WAMPServer2.1 to discover this bug.
The current PHP version used on used WAMPServer2.1 is 5.3.5.

This prints "We are at the elseif condition.".
The same happens if the $y value is false.

Expected result:
----------------
Expected result would be: "I don't know what's X value.".

Actual result:
--------------
Actual result would be: "I don't know what's X value.".

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 [2012-01-06 16:14 UTC] danillo dot paiva dot toledo at gmail dot com 
$x = 0;
$y = "some_string";

if( $x == 2 ) {
	echo "X = 2.<br/>";
	echo "Inner first IF";
} elseif ( $x == $y ) {
	echo "We are at the elseif condition.";
} else {
	echo "I don't know what's X value.";
}


1st - That's my first time using bug report on php.net.
2nd - I'm brazilia(sorry my english).
3rd - I don't know I'm using the correct channel to report this.

I used WAMPServer2.1 to discover this bug.
The current PHP version used on used WAMPServer2.1 is 5.3.5.

This prints "We are at the elseif condition.".
The same happens if the $y value is false.
 [2012-01-06 16:22 UTC] anon at anon dot anon 
This occurs because 0 == "some_string" is true, and 0 == false is true. See:
http://php.net/manual/en/types.comparisons.php
Use === instead of == (and !== instead of !=) to stop type conversion in comparisons.
 [2012-01-06 22:03 UTC] felipe@php.net 
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php
 [2012-01-06 22:03 UTC] felipe@php.net
-Status: Open +Status: Bogus
 [2012-01-09 15:13 UTC] danillo dot paiva dot toledo at gmail dot com 
I used the === instead of == and it worked as expected.

But I wanna know, why 0 == "some_string" returns true?
 
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