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Bug #25365 negation of === does not work
Submitted: 2003-09-02 14:03 UTC Modified: 2003-09-03 01:27 UTC
From: daniel dot oger at swing dot be Assigned:
Status: Not a bug Package: Variables related
PHP Version: 4.3.3 OS: win xP Pro
Private report: No CVE-ID: None
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 [2003-09-02 14:03 UTC] daniel dot oger at swing dot be 
Description:
------------
The === operator does not work if preceeded with !



Reproduce code:
---------------
$result=0; // number zero
if (!$result === FALSE)
  echo "ZERO";
else
  echo "EMPTY";


Expected result:
----------------
ZERO


Actual result:
--------------
EMPTY

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 [2003-09-02 14:12 UTC] pollita@php.net 
That's because you're supposed to use "!==", i.e.:

if ($result !== FALSE)
  echo "ZERO";
else
  echo "EMPTY";
 [2003-09-02 14:13 UTC] derick@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

This is exactly what should happen

it is evaluated as
if ((!$result) === FALSE)

which of course is FALSE as !$result <=> TRUE (0 is considered as FALSE):

<?php
$r = 0; var_dump(!$r);
?>
bool(true)
 [2003-09-03 01:27 UTC] daniel dot oger at swing dot be 
My purpose is to check the result of strpos() when the searched string is at the beginning of the word ==>(strpos()=0.

I use === to make a distinction between FALSE and zero.
 
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