Re: [PHP] ltrim behavior.

[Robert Cummings]

On Thu, 2009-03-12 at 12:46 -0400, tedd wrote:
> At 10:18 AM -0400 3/12/09, Steve Holmes wrote:
> >On Thu, Mar 12, 2009 at 9:47 AM, tedd 
> ><tedd.sperl...@gmail.com> wrote:
> >
> >
> >Tedd,
> >Just because I'm a nit-picker, your comments are wrong.
> >Exchange the right and left comments and it's right.
> >Steve.
> 
> Steve:
> 
> No, my routines work for me -- I'm dyslexic.  :-)

*lol* Job security through dyslexic obscurity!!

;)

Cheers,
Rob.
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Re: [PHP] ltrim behavior.

[tedd]

At 10:18 AM -0400 3/12/09, Steve Holmes wrote:
On Thu, Mar 12, 2009 at 9:47 AM, tedd 
<tedd.sperl...@gmail.com> wrote:



Tedd,
Just because I'm a nit-picker, your comments are wrong.
Exchange the right and left comments and it's right.
Steve.


Steve:

No, my routines work for me -- I'm dyslexic.  :-)

Seriously, I use these routines all the time and never realized that 
they were reversed.


Thanks (I think),

tedd


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Re: [PHP] ltrim behavior.

[Steve Holmes]

On Thu, Mar 12, 2009 at 9:47 AM, tedd  wrote:

> At 3:38 PM -0400 3/11/09, Robert Cummings wrote:
>
>>
>> Just because I'm a nice guy... :)
>>
>
> Yeah, me too -- here are three routines I use for cutting the right, left
> and middle portions of strings. These were keyword routines I used in
> FutureBasic -- they seemed to make sense to me so I carried them into php.
>
> 
> // == returns the right-most number of characters from a string
> // $string = "123456789"
> // right($string, 3) returns "123"
>
> function right($string, $length)
>{
>$str = substr($string, -$length, $length);
>return $str;
>}
>
> // == returns the left-most number of characters from a string
> // $string = "123456789"
> // left($string, 3) returns "789"
>
> function left($string, $length)
>{
>$str = substr($string, 0, $length);
>return $str;
>}
>
> // == returns the middle number of characters from a string starting
> from the left
> // $string = "123456789"
> // mid($string, 3, 4) returns "4567"
>
> function mid($string, $left_start, $length)
>{
>$str = substr($string, $left_start, $length);
>return $str;
>}
> ?>
>
> Cheers,
>
> tedd
> --
> ---
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>
>
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>
>
Tedd,
Just because I'm a nit-picker, your comments are wrong. Exchange the right
and left comments and it's right.
Steve.

Re: [PHP] ltrim behavior.

[tedd]

At 5:03 PM -0400 3/11/09, Peter van der Does wrote:


Thanks and I apologize for the "stupid" question.


The only "stupid question" is the one that's not asked.

The ltrim() caught me the first time I used it too. I was thinking it 
was "trim this string off the left" when it was "trim these 
characters off the left".


Cheers,

tedd
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Re: [PHP] ltrim behavior.

[tedd]

At 3:38 PM -0400 3/11/09, Robert Cummings wrote:


Just because I'm a nice guy... :)


Yeah, me too -- here are three routines I use for cutting the right, 
left and middle portions of strings. These were keyword routines I 
used in FutureBasic -- they seemed to make sense to me so I carried 
them into php.


// == returns the middle number of characters from a string 
starting from the left

// $string = "123456789"
// mid($string, 3, 4) returns "4567"

function mid($string, $left_start, $length)
{
$str = substr($string, $left_start, $length);
return $str;
}
?>

Cheers,

tedd
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Re: [PHP] ltrim behavior.

[Peter van der Does]

On Wed, 11 Mar 2009 15:28:04 -0400
Paul M Foster  wrote:

> On Wed, Mar 11, 2009 at 03:07:18PM -0400, Peter van der Does wrote:
> 
> > This might be old for some of you but I never encountered it until
> > today and I would like to know why this is happening.
> > 
> > Here's the situation:
> > php > $a='data[options][name]';
> > php > echo ltrim($a,'data[');
> > options][name]
> > 
> > Just as I expected.
> > 
> > Next one:
> > php > $a='options[options][name]';
> > php > echo ltrim($a,'options[');
> > ][name]
> > 
> > UH, what?
> > Not exactly what I expected.
> > 
> > This works:
> > php > $a='options[options][name]';
> > php > echo ltrim(ltrim($a,'options'),'[');
> > options][name]
> > 
> > Can somebody explain the second behavior? Is this a known bug in
> > PHP, I'm running PHP 5.2.6 on Ubuntu.
> 
> Take a look at the documentation for ltrim():
> 
> http://us2.php.net/manual/en/function.ltrim.php
> 
> The string you're including as the second parameter to ltrim() is the
> *characters* you want to trim on, not the *character pattern*. If you
> think about it that way, it will make sense. Also one of the examples
> on the referenced documentation page does something similar to what
> you've cited. Work through that example, and you'll see.
> 
> Paul
> 
OK, the light bulb went on now. I did see it was characters, and not a
string, but for some reason it didn't get in my brain what the
consequence was.
Thanks and I apologize for the "stupid" question.


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Re: [PHP] ltrim behavior.

[Robert Cummings]

On Wed, 2009-03-11 at 15:34 -0400, Robert Cummings wrote:
> On Wed, 2009-03-11 at 15:07 -0400, Peter van der Does wrote:
> > php > $a='data[options][name]';
> > php > echo ltrim($a,'data[');
> > options][name]
> > 
> > Just as I expected.
> > 
> > Next one:
> > php > $a='options[options][name]';
> > php > echo ltrim($a,'options[');
> > ][name]
> > 
> > UH, what?
> > Not exactly what I expected.
> > 
> > This works:
> > php > $a='options[options][name]';
> > php > echo ltrim(ltrim($a,'options'),'[');
> > options][name]
> 
> It doesn't trim strings, it trims characters. The second argument is a
> list of characters. I'm surprised this has worked for you up till now. I
> think most people would use the following to do what you want:
> 
>  
> echo preg_replace( '#^options\[#', '', $a )
> 
> ?>
> 
> Or they would do test and strip:
> 
>  
> if( substr( $a, 0, 8 ) === 'options[' )
> {
> echo substr( $a, 8 );
> }
> 
> ?>
> 
> Or maybe:
> 
>  
> if( preg_match( '#^options\[#', $a ) )
> {
> echo substr( $a, 8 );
> }
> 
> ?>

Just because I'm a nice guy... :) here's the generic strip:



Cheers,
Rob.
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Re: [PHP] ltrim behavior.

[Robert Cummings]

On Wed, 2009-03-11 at 15:07 -0400, Peter van der Does wrote:
> php > $a='data[options][name]';
> php > echo ltrim($a,'data[');
> options][name]
> 
> Just as I expected.
> 
> Next one:
> php > $a='options[options][name]';
> php > echo ltrim($a,'options[');
> ][name]
> 
> UH, what?
> Not exactly what I expected.
> 
> This works:
> php > $a='options[options][name]';
> php > echo ltrim(ltrim($a,'options'),'[');
> options][name]

It doesn't trim strings, it trims characters. The second argument is a
list of characters. I'm surprised this has worked for you up till now. I
think most people would use the following to do what you want:



Or they would do test and strip:



Or maybe:



Cheers,
Rob.
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Re: [PHP] ltrim behavior.

[Paul M Foster]

On Wed, Mar 11, 2009 at 03:07:18PM -0400, Peter van der Does wrote:

> This might be old for some of you but I never encountered it until
> today and I would like to know why this is happening.
> 
> Here's the situation:
> php > $a='data[options][name]';
> php > echo ltrim($a,'data[');
> options][name]
> 
> Just as I expected.
> 
> Next one:
> php > $a='options[options][name]';
> php > echo ltrim($a,'options[');
> ][name]
> 
> UH, what?
> Not exactly what I expected.
> 
> This works:
> php > $a='options[options][name]';
> php > echo ltrim(ltrim($a,'options'),'[');
> options][name]
> 
> Can somebody explain the second behavior? Is this a known bug in PHP,
> I'm running PHP 5.2.6 on Ubuntu.

Take a look at the documentation for ltrim():

http://us2.php.net/manual/en/function.ltrim.php

The string you're including as the second parameter to ltrim() is the
*characters* you want to trim on, not the *character pattern*. If you
think about it that way, it will make sense. Also one of the examples on
the referenced documentation page does something similar to what you've
cited. Work through that example, and you'll see.

Paul

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[PHP] ltrim behavior.

[Peter van der Does]

This might be old for some of you but I never encountered it until
today and I would like to know why this is happening.

Here's the situation:
php > $a='data[options][name]';
php > echo ltrim($a,'data[');
options][name]

Just as I expected.

Next one:
php > $a='options[options][name]';
php > echo ltrim($a,'options[');
][name]

UH, what?
Not exactly what I expected.

This works:
php > $a='options[options][name]';
php > echo ltrim(ltrim($a,'options'),'[');
options][name]

Can somebody explain the second behavior? Is this a known bug in PHP,
I'm running PHP 5.2.6 on Ubuntu.

-- 
Peter van der Does

GPG key: E77E8E98

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