Re: [PHP] I know this is not easy and I'm not stupid but...
On 8/10/07, Zoltán Németh <[EMAIL PROTECTED]> wrote:
> 2007. 08. 10, péntek keltezéssel 02.31-kor Jan Reiter ezt írta:
> > Hi!
> > Thank you for your response!
> >
> > The only intention of my code was to investigate the (back then) unexpected
> > behavior of the if statement.
> >
> >
> > With $var['test'] set to "blah" this expression should be false
> > ($var['test'] == 0) for what I know ...
> >
> > $var['test'] = "blah";
> > var_dump($var['test'] == 0);
> >
> > //returns bool(true)
> >
> > Now I know why this happens! According to Table 6.5 of the Operators page in
> > the PHP Manual in this comparison all of the values are converted to
> > integer. And atoi("blah") for sure will fail!;-) So you have to use === to
> > keep the types of the values!
>
> I found something interesting:
>
> [EMAIL PROTECTED]:~ php -r '$var = 'bla'; var_dump('0' == $var);'
> bool(true)
> [EMAIL PROTECTED]:~ php -r '$var = 'bla'; var_dump("0" == $var);'
> bool(false)
>
> version is 5.2.1
>
> is this expected behaviour to be a difference between the two types of
> quotes in this case?
>
> greets
> Zoltán Németh
I think you're little bit confused by the quotes :P
and since you don't have error reporting including E_NOTICE, you don't
see that there's some problem with your code :P
If I execute your code with the -n option, I get same results.
When I put them in a PHP file like this:
I get :
bool(false)
bool(false)
and you probably also ;)
Tijnema
>
> >
> > Jan
> >
> >
> >
> > -Original Message-
> > From: Jim Lucas [mailto:[EMAIL PROTECTED]
> > Sent: Friday, August 10, 2007 1:47 AM
> > To: Jan Reiter
> > Cc: [EMAIL PROTECTED]; php-general@lists.php.net
> > Subject: Re: [PHP] I know this is not easy and I'm not stupid but...
> >
> > Jan Reiter wrote:
> > > Hi!
> > >
> > > Phil:
> > > Still I am curious what var_dump($userValues['afterDark']); at line 102.5
> > > would return.
> > > I managed to recreate that fault with
> > >
> > > $var['test'] = "blah";
> > >
> > > echo ($var['test']);
> > >
> > > if( $var['test'] == 0)
> > > {
> > > echo "ok";
> > > }
> > >
> > > //this returns blahok -- not expected.
> > >
> > > In my case Var_dump() returns string(4) "blah" as expected.
> > >
> > > Using
> > >
> > > if( $var['test'] === 0)
> > >
> > > behaves as expected!!
> >
> > Are you wanting to only test for a empty/non-empty string?
> >
> > if so, use this.
> >
> > if ( empty($var['test']) ) {
> > echo "var['test'] is empty";
> > }
> >
> > >
> > >
> > > Jim:
> > > TypeCasting would only be effective if you used the type sensitive
> > > comparison operator === , because with "==" 0 equals NULL equals false
> > > equals "" and so on ... or do I miss something here??
> > >
> > >
> > > Hope that solves it for you! I'm still investigating why my first examples
> > > fails. I've got the strong feeling that I'm missing something there. I
> > don't
> > > believe in a php bug or a memory leak in this case! Must be something
> > pretty
> > > obvious! Anyone a clue??
> > >
> > > Thanks,
> > > Jan
> > >
> > >
> >
>
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>
>
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Re: [PHP] I know this is not easy and I'm not stupid but...
On Thu, August 9, 2007 1:24 am, Phil Curry wrote:
$userValues = ' 1';
> line 102 echo ($userValues['afterDark']); // outputs 1
>
> line 103 if ( $userValues['afterDark'] == 0 ) {// passes
When using echo to display debug output ALWAYS surround the data with
some kind of delimiter:
echo "'", ($userValues['afterDark']), "'";
Or, use var_dump or print_r to have PHP do this for you.
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RE: [PHP] I know this is not easy and I'm not stupid but...
2007. 08. 10, péntek keltezéssel 02.31-kor Jan Reiter ezt írta:
> Hi!
> Thank you for your response!
>
> The only intention of my code was to investigate the (back then) unexpected
> behavior of the if statement.
>
>
> With $var['test'] set to "blah" this expression should be false
> ($var['test'] == 0) for what I know ...
>
> $var['test'] = "blah";
> var_dump($var['test'] == 0);
>
> //returns bool(true)
>
> Now I know why this happens! According to Table 6.5 of the Operators page in
> the PHP Manual in this comparison all of the values are converted to
> integer. And atoi("blah") for sure will fail!;-) So you have to use === to
> keep the types of the values!
I found something interesting:
[EMAIL PROTECTED]:~ php -r '$var = 'bla'; var_dump('0' == $var);'
bool(true)
[EMAIL PROTECTED]:~ php -r '$var = 'bla'; var_dump("0" == $var);'
bool(false)
version is 5.2.1
is this expected behaviour to be a difference between the two types of
quotes in this case?
greets
Zoltán Németh
>
> Jan
>
>
>
> -----Original Message-----
> From: Jim Lucas [mailto:[EMAIL PROTECTED]
> Sent: Friday, August 10, 2007 1:47 AM
> To: Jan Reiter
> Cc: [EMAIL PROTECTED]; php-general@lists.php.net
> Subject: Re: [PHP] I know this is not easy and I'm not stupid but...
>
> Jan Reiter wrote:
> > Hi!
> >
> > Phil:
> > Still I am curious what var_dump($userValues['afterDark']); at line 102.5
> > would return.
> > I managed to recreate that fault with
> >
> > $var['test'] = "blah";
> >
> > echo ($var['test']);
> >
> > if( $var['test'] == 0)
> > {
> > echo "ok";
> > }
> >
> > //this returns blahok -- not expected.
> >
> > In my case Var_dump() returns string(4) "blah" as expected.
> >
> > Using
> >
> > if( $var['test'] === 0)
> >
> > behaves as expected!!
>
> Are you wanting to only test for a empty/non-empty string?
>
> if so, use this.
>
> if ( empty($var['test']) ) {
> echo "var['test'] is empty";
> }
>
> >
> >
> > Jim:
> > TypeCasting would only be effective if you used the type sensitive
> > comparison operator === , because with "==" 0 equals NULL equals false
> > equals "" and so on ... or do I miss something here??
> >
> >
> > Hope that solves it for you! I'm still investigating why my first examples
> > fails. I've got the strong feeling that I'm missing something there. I
> don't
> > believe in a php bug or a memory leak in this case! Must be something
> pretty
> > obvious! Anyone a clue??
> >
> > Thanks,
> > Jan
> >
> >
>
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RE: [PHP] I know this is not easy and I'm not stupid but...
Ummh, no!
(int) and (integer) perform a C style atoi() conversion.
(int)"blah" => integer 0
(int)"" => integer 0
(int)"1"=> integer 1
(int)"12" => integer 12
("1" == 0) => false
("blah" == 0) => true
( (int)$userValues['afterDark'] === 0 ) only is true, if
$userValues['afterDark'] is a string not containing an integer. This is what
happens:
$userValues['afterDark'] gets converted to integer by atoi(), and after that
is compared by type and value to integer 0. So the type part of the test
will pass for sure.
But perhaps you should try to adapt the comparison to the DB value. So try
($userValues['afterDark'] == (string)0)
This expression is only true if $userValues['afterDark'] equals "0", not
when $userValues['afterDark'] equals "" or "blah" or "1"
Hope that helps!
Jan
-----Original Message-
From: Phil Curry [mailto:[EMAIL PROTECTED]
Sent: Friday, August 10, 2007 2:49 AM
To: Stut
Cc: php-general
Subject: Re: [PHP] I know this is not easy and I'm not stupid but...
> Please include the list when replying.
>
> Phil Curry wrote:
>>> Phil Curry wrote:
>>>> how can this be? This is not the first time I've run into a
>>>> situation like this. What am I missing?
>>>> line 102echo ($userValues['afterDark']); //
>>>> outputs 1
>>>> line 103if ( $userValues['afterDark'] == 0 ) {// passes
>>>
>>> Add a line at 102.5...
>>>
>>> var_dump($userValues['afterDark']);
>>>
>>> What type is that variable?
>> Don't have to do a dump, I know its a tinyint(1), not null, default 0
>
> That would be the type in the database, not the type of that
> variable at that time.
>
> -Stut
>
> --
> http://stut.net/
Absolutely right. didn't think of that.
var_dump($userValues['afterDark']); ==> string(1) "1"
but then I'm comparing a string to an int and the result always seems
to pass. So does that mean any string compared to any int will be true?
By casting (int)$userValues['afterDark'] the test still passes and
var_dump shows the (int)$userValues['afterDark'] as an int(1) but
does give a value like the previous example.
ie. string(1)"1" but only int(1) Not sure if the expression has a
value of "1" now that its been cast.
Then finally if ( (int)$userValues['afterDark'] === 0 ) {//
passes
So:
if ( $userValues['afterDark'] == 0 ) { // passes
if ( (int)$userValues['afterDark'] == 0 ) { // passes
if ( (int)$userValues['afterDark'] === 0 ) { // passes
And the value of afterdark in the mysql table is tinyint(1) 1.
And echo( 1+(int)$userValues['afterDark']);// outputs 2
Now I'm confused!
-Phil
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Re: [PHP] I know this is not easy and I'm not stupid but...
Please include the list when replying.
Phil Curry wrote:
Phil Curry wrote:
how can this be? This is not the first time I've run into a
situation like this. What am I missing?
line 102echo ($userValues['afterDark']); //
outputs 1
line 103if ( $userValues['afterDark'] == 0 ) {// passes
Add a line at 102.5...
var_dump($userValues['afterDark']);
What type is that variable?
Don't have to do a dump, I know its a tinyint(1), not null, default 0
That would be the type in the database, not the type of that
variable at that time.
-Stut
--
http://stut.net/
Absolutely right. didn't think of that.
var_dump($userValues['afterDark']); ==> string(1) "1"
but then I'm comparing a string to an int and the result always seems
to pass. So does that mean any string compared to any int will be true?
By casting (int)$userValues['afterDark'] the test still passes and
var_dump shows the (int)$userValues['afterDark'] as an int(1) but
does give a value like the previous example.
ie. string(1)"1" but only int(1) Not sure if the expression has a
value of "1" now that its been cast.
Then finally if ( (int)$userValues['afterDark'] === 0 ) {//
passes
So:
if ( $userValues['afterDark'] == 0 ) { // passes
if ( (int)$userValues['afterDark'] == 0 ) { // passes
if ( (int)$userValues['afterDark'] === 0 ) { // passes
And the value of afterdark in the mysql table is tinyint(1) 1.
And echo( 1+(int)$userValues['afterDark']);// outputs 2
Now I'm confused!
-Phil
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RE: [PHP] I know this is not easy and I'm not stupid but...
Hi!
Thank you for your response!
The only intention of my code was to investigate the (back then) unexpected
behavior of the if statement.
With $var['test'] set to "blah" this expression should be false
($var['test'] == 0) for what I know ...
$var['test'] = "blah";
var_dump($var['test'] == 0);
//returns bool(true)
Now I know why this happens! According to Table 6.5 of the Operators page in
the PHP Manual in this comparison all of the values are converted to
integer. And atoi("blah") for sure will fail!;-) So you have to use === to
keep the types of the values!
Jan
-Original Message-
From: Jim Lucas [mailto:[EMAIL PROTECTED]
Sent: Friday, August 10, 2007 1:47 AM
To: Jan Reiter
Cc: [EMAIL PROTECTED]; php-general@lists.php.net
Subject: Re: [PHP] I know this is not easy and I'm not stupid but...
Jan Reiter wrote:
> Hi!
>
> Phil:
> Still I am curious what var_dump($userValues['afterDark']); at line 102.5
> would return.
> I managed to recreate that fault with
>
> $var['test'] = "blah";
>
> echo ($var['test']);
>
> if( $var['test'] == 0)
> {
> echo "ok";
> }
>
> //this returns blahok -- not expected.
>
> In my case Var_dump() returns string(4) "blah" as expected.
>
> Using
>
> if( $var['test'] === 0)
>
> behaves as expected!!
Are you wanting to only test for a empty/non-empty string?
if so, use this.
if ( empty($var['test']) ) {
echo "var['test'] is empty";
}
>
>
> Jim:
> TypeCasting would only be effective if you used the type sensitive
> comparison operator === , because with "==" 0 equals NULL equals false
> equals "" and so on ... or do I miss something here??
>
>
> Hope that solves it for you! I'm still investigating why my first examples
> fails. I've got the strong feeling that I'm missing something there. I
don't
> believe in a php bug or a memory leak in this case! Must be something
pretty
> obvious! Anyone a clue??
>
> Thanks,
> Jan
>
>
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Re: [PHP] I know this is not easy and I'm not stupid but...
Jan Reiter wrote:
Hi!
Phil:
Still I am curious what var_dump($userValues['afterDark']); at line 102.5
would return.
I managed to recreate that fault with
$var['test'] = "blah";
echo ($var['test']);
if( $var['test'] == 0)
{
echo "ok";
}
//this returns blahok -- not expected.
In my case Var_dump() returns string(4) "blah" as expected.
Using
if( $var['test'] === 0)
behaves as expected!!
Are you wanting to only test for a empty/non-empty string?
if so, use this.
if ( empty($var['test']) ) {
echo "var['test'] is empty";
}
Jim:
TypeCasting would only be effective if you used the type sensitive
comparison operator === , because with "==" 0 equals NULL equals false
equals "" and so on ... or do I miss something here??
Hope that solves it for you! I'm still investigating why my first examples
fails. I've got the strong feeling that I'm missing something there. I don't
believe in a php bug or a memory leak in this case! Must be something pretty
obvious! Anyone a clue??
Thanks,
Jan
-Original Message-----
From: Jim Lucas [mailto:[EMAIL PROTECTED]
Sent: Thursday, August 09, 2007 8:08 PM
To: Stut
Cc: Phil Curry; php-general
Subject: Re: [PHP] I know this is not easy and I'm not stupid but...
Stut wrote:
Please include the list when replying.
Phil Curry wrote:
Phil Curry wrote:
how can this be? This is not the first time I've run into a
situation like this. What am I missing?
line 102echo ($userValues['afterDark']); // outputs 1
line 103if ( $userValues['afterDark'] == 0 ) {// passes
Add a line at 102.5...
var_dump($userValues['afterDark']);
What type is that variable?
Don't have to do a dump, I know its a tinyint(1), not null, default 0
PHP does not have a type of tinyint
knowing now that this comes from a database, if it is mysql, then it is of
type string
PHP converts all fields when pulled from the database into strings. It does
not take into account
what type the field is actually set to in mysql.
Try puting a (int) in front of the condition like this
if ( (int)$userValues['afterDark'] == 0 ) {
...
}
Maybe this will help
That would be the type in the database, not the type of that variable at
that time.
-Stut
--
Jim Lucas
"Some men are born to greatness, some achieve greatness,
and some have greatness thrust upon them."
Twelfth Night, Act II, Scene V
by William Shakespeare
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RE: [PHP] I know this is not easy and I'm not stupid but...
Hi!
Phil:
Still I am curious what var_dump($userValues['afterDark']); at line 102.5
would return.
I managed to recreate that fault with
$var['test'] = "blah";
echo ($var['test']);
if( $var['test'] == 0)
{
echo "ok";
}
//this returns blahok -- not expected.
In my case Var_dump() returns string(4) "blah" as expected.
Using
if( $var['test'] === 0)
behaves as expected!!
Jim:
TypeCasting would only be effective if you used the type sensitive
comparison operator === , because with "==" 0 equals NULL equals false
equals "" and so on ... or do I miss something here??
Hope that solves it for you! I'm still investigating why my first examples
fails. I've got the strong feeling that I'm missing something there. I don't
believe in a php bug or a memory leak in this case! Must be something pretty
obvious! Anyone a clue??
Thanks,
Jan
-Original Message-
From: Jim Lucas [mailto:[EMAIL PROTECTED]
Sent: Thursday, August 09, 2007 8:08 PM
To: Stut
Cc: Phil Curry; php-general
Subject: Re: [PHP] I know this is not easy and I'm not stupid but...
Stut wrote:
> Please include the list when replying.
>
> Phil Curry wrote:
>>> Phil Curry wrote:
>>>> how can this be? This is not the first time I've run into a
>>>> situation like this. What am I missing?
>>>> line 102echo ($userValues['afterDark']); // outputs 1
>>>> line 103if ( $userValues['afterDark'] == 0 ) {// passes
>>>
>>> Add a line at 102.5...
>>>
>>> var_dump($userValues['afterDark']);
>>>
>>> What type is that variable?
>>
>> Don't have to do a dump, I know its a tinyint(1), not null, default 0
PHP does not have a type of tinyint
knowing now that this comes from a database, if it is mysql, then it is of
type string
PHP converts all fields when pulled from the database into strings. It does
not take into account
what type the field is actually set to in mysql.
Try puting a (int) in front of the condition like this
if ( (int)$userValues['afterDark'] == 0 ) {
...
}
Maybe this will help
>
> That would be the type in the database, not the type of that variable at
> that time.
>
> -Stut
>
--
Jim Lucas
"Some men are born to greatness, some achieve greatness,
and some have greatness thrust upon them."
Twelfth Night, Act II, Scene V
by William Shakespeare
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Re: [PHP] I know this is not easy and I'm not stupid but...
Stut wrote:
Please include the list when replying.
Phil Curry wrote:
Phil Curry wrote:
how can this be? This is not the first time I've run into a
situation like this. What am I missing?
line 102echo ($userValues['afterDark']); // outputs 1
line 103if ( $userValues['afterDark'] == 0 ) {// passes
Add a line at 102.5...
var_dump($userValues['afterDark']);
What type is that variable?
Don't have to do a dump, I know its a tinyint(1), not null, default 0
PHP does not have a type of tinyint
knowing now that this comes from a database, if it is mysql, then it is of type
string
PHP converts all fields when pulled from the database into strings. It does not take into account
what type the field is actually set to in mysql.
Try puting a (int) in front of the condition like this
if ( (int)$userValues['afterDark'] == 0 ) {
...
}
Maybe this will help
That would be the type in the database, not the type of that variable at
that time.
-Stut
--
Jim Lucas
"Some men are born to greatness, some achieve greatness,
and some have greatness thrust upon them."
Twelfth Night, Act II, Scene V
by William Shakespeare
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Re: [PHP] I know this is not easy and I'm not stupid but...
Please include the list when replying.
Phil Curry wrote:
Phil Curry wrote:
how can this be? This is not the first time I've run into a situation
like this. What am I missing?
line 102echo ($userValues['afterDark']); // outputs 1
line 103if ( $userValues['afterDark'] == 0 ) {// passes
Add a line at 102.5...
var_dump($userValues['afterDark']);
What type is that variable?
Don't have to do a dump, I know its a tinyint(1), not null, default 0
That would be the type in the database, not the type of that variable at
that time.
-Stut
--
http://stut.net/
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Re: [PHP] I know this is not easy and I'm not stupid but...
Phil Curry wrote:
how can this be? This is not the first time I've run into a situation
like this. What am I missing?
line 102echo ($userValues['afterDark']); // outputs 1
line 103if ( $userValues['afterDark'] == 0 ) {// passes
Add a line at 102.5...
var_dump($userValues['afterDark']);
What type is that variable?
-Stut
--
http://stut.net/
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