Sort question - make elements with = sign first

[Randell D.]

Folks,

I know I could do this with a foreach loop but it looks dirty. I'm
wondering if I can do this via array_walk() or asort() and would appreciate
some help..

I have an array - an example follows

$tmpArray[0]="one";
$tmpArray[1]="two";
$tmpArray[2]="three";
$tmpArray[3]="apples";
$tmpArray[4]="ref=1";

The elements can be written up in any order, thus the last element "ref=1"
could have been anywhere in the array, its just for this example that I have
placed it as the last element.

I need to read these elements, but I need to give precedence to first
reading the elements that contain an equals sign before the others... It
does *not* have to be alphabetically sorted - so the following result would
be acceptable:

$tmpArray[0]="ref=1";
$tmpArray[1]="one";
$tmpArray[2]="two";
$tmpArray[3]="three";
$tmpArray[4]="apples";

Can anyone suggest/tell me a method that might be environmentally friendly
to do this? I think array_walk might help but I've never worked out how to
use it...

Thanks
randelld

[Andy Hassall]

Re: Sort question - make elements with = sign first

On Mon, 08 Sep 2003 21:03:41 GMT, "Randell D."
<you.can.email. me.at.randelld@ yahoo.com> wrote:
[color=blue]
>
>Folks,
>
>I know I could do this with a foreach loop but it looks dirty. I'm
>wondering if I can do this via array_walk() or asort() and would appreciate
>some help..
>
>I have an array - an example follows
>
>$tmpArray[0]="one";
>$tmpArray[1]="two";
>$tmpArray[2]="three";
>$tmpArray[3]="apples";
>$tmpArray[4]="ref=1";
>
>The elements can be written up in any order, thus the last element "ref=1"
>could have been anywhere in the array, its just for this example that I have
>placed it as the last element.
>
>I need to read these elements, but I need to give precedence to first
>reading the elements that contain an equals sign before the others... It
>does *not* have to be alphabetically sorted - so the following result would
>be acceptable:
>
>$tmpArray[0]="ref=1";
>$tmpArray[1]="one";
>$tmpArray[2]="two";
>$tmpArray[3]="three";
>$tmpArray[4]="apples";
>
>Can anyone suggest/tell me a method that might be environmentally friendly
>to do this? I think array_walk might help but I've never worked out how to
>use it...[/color]

<pre>
<?php
$tmpArray[0]="one";
$tmpArray[1]="two";
$tmpArray[2]="three";
$tmpArray[3]="apples";
$tmpArray[4]="ref=1";

function equalsSort($a,$ b) {
if (strstr($a,'=') ) return -1;
if (strstr($b,'=') ) return 1;
return strcmp($a,$b);
}

usort($tmpArray , 'equalsSort');

var_dump($tmpAr ray);
?>
</pre>

array(5) {
[0]=>
string(5) "ref=1"
[1]=>
string(6) "apples"
[2]=>
string(3) "one"
[3]=>
string(5) "three"
[4]=>
string(3) "two"
}

--
Andy Hassall (andy@andyh.co. uk) icq(5747695) (http://www.andyh.co.uk)
Space: disk usage analysis tool (http://www.andyhsoftware.co.uk/space)

[Maarten van der Peet]

Re: Sort question - make elements with = sign first

Randell D. <you.can.email. me.at.randelld@ yahoo.com> wrote:
[color=blue]
> Folks,
>
> I know I could do this with a foreach loop but it looks dirty. I'm
> wondering if I can do this via array_walk() or asort() and would appreciate
> some help..[/color]

You'll need usort.

http://nl.php.net/manual/en/function.usort.php

<?php

$list = array('one', 'two', '=three', 'four', '=five');
print_array ($list);
usort($list, "is_prec");
print_array ($list);

function is_prec ($a, $b) {
if (substr($a,0,1) == '=' )
{
return -1;
}
elseif (substr($a,0,1) <> '=')
{
return 1;
}
else return 0;
}

function print_array($ar )
{
print "<pre>"; print_r($ar);pr int"</pre>";

}
?>


[color=blue]
>
> I have an array - an example follows
>
> $tmpArray[0]="one";
> $tmpArray[1]="two";
> $tmpArray[2]="three";
> $tmpArray[3]="apples";
> $tmpArray[4]="ref=1";
>
> The elements can be written up in any order, thus the last element "ref=1"
> could have been anywhere in the array, its just for this example that I have
> placed it as the last element.
>
> I need to read these elements, but I need to give precedence to first
> reading the elements that contain an equals sign before the others... It
> does *not* have to be alphabetically sorted - so the following result would
> be acceptable:
>
> $tmpArray[0]="ref=1";
> $tmpArray[1]="one";
> $tmpArray[2]="two";
> $tmpArray[3]="three";
> $tmpArray[4]="apples";
>
> Can anyone suggest/tell me a method that might be environmentally friendly
> to do this? I think array_walk might help but I've never worked out how to
> use it...
>
> Thanks
> randelld[/color]

Goodluck.

--
Maarten van der Peet

[Randell D.]

Re: Sort question - make elements with = sign first


"Maarten van der Peet" <Maarten.van.de r.Peet@haalditv etweg.xs4all.nl > wrote
in message
news:1g0zrl6.1j 3vurcbn178N%Maa rten.van.der.Pe et@haalditvetwe g.xs4all.nl...[color=blue]
> Randell D. <you.can.email. me.at.randelld@ yahoo.com> wrote:
>[color=green]
> > Folks,
> >
> > I know I could do this with a foreach loop but it looks dirty. I'm
> > wondering if I can do this via array_walk() or asort() and would[/color][/color]
appreciate[color=blue][color=green]
> > some help..[/color]
>
> You'll need usort.
>
> http://nl.php.net/manual/en/function.usort.php
>
> <?php
>
> $list = array('one', 'two', '=three', 'four', '=five');
> print_array ($list);
> usort($list, "is_prec");
> print_array ($list);
>
> function is_prec ($a, $b) {
> if (substr($a,0,1) == '=' )
> {
> return -1;
> }
> elseif (substr($a,0,1) <> '=')
> {
> return 1;
> }
> else return 0;
> }
>
> function print_array($ar )
> {
> print "<pre>"; print_r($ar);pr int"</pre>";
>
> }
> ?>
>
>
>[color=green]
> >
> > I have an array - an example follows
> >
> > $tmpArray[0]="one";
> > $tmpArray[1]="two";
> > $tmpArray[2]="three";
> > $tmpArray[3]="apples";
> > $tmpArray[4]="ref=1";
> >
> > The elements can be written up in any order, thus the last element[/color][/color]
"ref=1"[color=blue][color=green]
> > could have been anywhere in the array, its just for this example that I[/color][/color]
have[color=blue][color=green]
> > placed it as the last element.
> >
> > I need to read these elements, but I need to give precedence to first
> > reading the elements that contain an equals sign before the others... It
> > does *not* have to be alphabetically sorted - so the following result[/color][/color]
would[color=blue][color=green]
> > be acceptable:
> >
> > $tmpArray[0]="ref=1";
> > $tmpArray[1]="one";
> > $tmpArray[2]="two";
> > $tmpArray[3]="three";
> > $tmpArray[4]="apples";
> >
> > Can anyone suggest/tell me a method that might be environmentally[/color][/color]
friendly[color=blue][color=green]
> > to do this? I think array_walk might help but I've never worked out how[/color][/color]
to[color=blue][color=green]
> > use it...
> >
> > Thanks
> > randelld[/color]
>
> Goodluck.
>
> --
> Maarten van der Peet[/color]

I don't think you read my entire post properly... I do not have any element
that begins with an = sign, instead, I have *some* elements that *have* an
equals sign somewhere. The array you created in your example is not the
same as the array in my question.

Thanks for trying though.

[Randell D.]

Re: Sort question - make elements with = sign first

"Andy Hassall" <andy@andyh.co. uk> wrote in message
news:uvsplv4b00 5ouoiojm4snjml1 s0if10ato@4ax.c om...[color=blue]
> On Mon, 08 Sep 2003 21:03:41 GMT, "Randell D."
> <you.can.email. me.at.randelld@ yahoo.com> wrote:
>[color=green]
> >
> >Folks,
> >
> >I know I could do this with a foreach loop but it looks dirty. I'm
> >wondering if I can do this via array_walk() or asort() and would[/color][/color]
appreciate[color=blue][color=green]
> >some help..
> >
> >I have an array - an example follows
> >
> >$tmpArray[0]="one";
> >$tmpArray[1]="two";
> >$tmpArray[2]="three";
> >$tmpArray[3]="apples";
> >$tmpArray[4]="ref=1";
> >
> >The elements can be written up in any order, thus the last element[/color][/color]
"ref=1"[color=blue][color=green]
> >could have been anywhere in the array, its just for this example that I[/color][/color]
have[color=blue][color=green]
> >placed it as the last element.
> >
> >I need to read these elements, but I need to give precedence to first
> >reading the elements that contain an equals sign before the others... It
> >does *not* have to be alphabetically sorted - so the following result[/color][/color]
would[color=blue][color=green]
> >be acceptable:
> >
> >$tmpArray[0]="ref=1";
> >$tmpArray[1]="one";
> >$tmpArray[2]="two";
> >$tmpArray[3]="three";
> >$tmpArray[4]="apples";
> >
> >Can anyone suggest/tell me a method that might be environmentally[/color][/color]
friendly[color=blue][color=green]
> >to do this? I think array_walk might help but I've never worked out how[/color][/color]
to[color=blue][color=green]
> >use it...[/color]
>
> <pre>
> <?php
> $tmpArray[0]="one";
> $tmpArray[1]="two";
> $tmpArray[2]="three";
> $tmpArray[3]="apples";
> $tmpArray[4]="ref=1";
>
> function equalsSort($a,$ b) {
> if (strstr($a,'=') ) return -1;
> if (strstr($b,'=') ) return 1;
> return strcmp($a,$b);
> }
>
> usort($tmpArray , 'equalsSort');
>
> var_dump($tmpAr ray);
> ?>
> </pre>
>
> array(5) {
> [0]=>
> string(5) "ref=1"
> [1]=>
> string(6) "apples"
> [2]=>
> string(3) "one"
> [3]=>
> string(5) "three"
> [4]=>
> string(3) "two"
> }
>
> --
> Andy Hassall (andy@andyh.co. uk) icq(5747695) (http://www.andyh.co.uk)
> Space: disk usage analysis tool (http://www.andyhsoftware.co.uk/space)[/color]

Cheers - that works perfectly... and looks tidy too...

[Maarten van der Peet]

Re: Sort question - make elements with = sign first

Randell D. <you.can.email. me.at.randelld@ yahoo.com> wrote:

<snip>[color=blue]
> I don't think you read my entire post properly... I do not have any element
> that begins with an = sign, instead, I have *some* elements that *have* an
> equals sign somewhere. The array you created in your example is not the
> same as the array in my question.
>[/color]
Yes you're right. I must have had a black out. :-)

But the understanding and using of 'usort' is still valid.
[color=blue]
> Thanks for trying though.[/color]

You're welkom.

--
Maarten van der Peet