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Posted by Jerry Stuckle on 09/08/07 01:31
Rik Wasmus wrote:
> On Fri, 07 Sep 2007 21:03:26 +0200, Jerry Stuckle
> <jstucklex@attglobal.net> wrote:
>
>> Rik Wasmus wrote:
>>> On Fri, 07 Sep 2007 19:13:57 +0200, Jerry Stuckle
>>> <jstucklex@attglobal.net> wrote:
>>>
>>>> J. Frank Parnell wrote:
>>>>> On Fri, 07 Sep 2007 07:22:46 -0400, Jerry Stuckle
>>>>> <jstucklex@attglobal.net>
>>>>> wrote:
>>>>>
>>>>>> J. Frank Parnell wrote:
>>>>>>> On Thu, 06 Sep 2007 21:41:27 -0400, Jerry Stuckle
>>>>>>> <jstucklex@attglobal.net>
>>>>>>> wrote:
>>>>>>>
>>>>>>>> J. Frank Parnell wrote:
>>>>>>>>> Hello,
>>>>>>>>> So, I was wondering how to do this:
>>>>>>>>>
>>>>>>>>> foreach($foo as $k=>$v AND $bar as $k2=>$v2){
>>>>>>>>> echo '<TR><TD>$k</TD><TD>$v</TD><TD>$k2</TD><TD>$v2</TD></TR>;
>>>>>>>>> }
>>>>>>>>>
>>>>>>>>> Thanks,
>>>>>>>> No.
>>>>>>>>
>>>>>>>> However, you can use "each" to do the same thing, i.e.
>>>>>>>>
>>>>>>>> reset $array1;
>>>>>>>> reset $array2;
>>>>>>>>
>>>>>>>> for ((list($key1, $val1) = each($array1)) &&
>>>>>>>> (list($key2, $val2) = each($array2)) {
>>>>>>>> // $key1 and val1 contain the key and value for an element in
>>>>>>>> $array1
>>>>>>>> // $key2 and val2 contain the key and value for an element in
>>>>>>>> $array2
>>>>>>>> // Do your stuff here
>>>>>>>> }
>>>>>>>>
>>>>>>>> It will stop as soon as you run out of elements in either array.
>>>>>>> Ah, cool, I saw similar on the php.net. Is there a way to do it
>>>>>>> so that it will
>>>>>>> go thru all of both, even if one runs out?
>>>>>> What do you want to do with the array which runs out? And what do
>>>>>> you want to do with the array with items left?
>>>>> I figured the var that ran out would just be empty while the
>>>>> other var is still
>>>>> listing, eaching, etc. It might be handy to be able to specify a
>>>>> default value
>>>>> instead of empty, like   for the table exapmle above. Looks
>>>>> like I could
>>>>> just stick a little if() in Satya's code.
>>>>>
>>>>
>>>> OK, then try this:
>>>>
>>>> reset $array1;
>>>> reset $array2;
>>>>
>>>> for (($val1 = each($array1)) || ($val2 = each($array2)) {
>>>> if ($val1) { // false if at the end
>>>> // $val1['key'] contains the key
>>>> // $val1['value'] contains the value
>>>> echo $val1['key'] . '=>' $val1['value'];
>>>> }
>>>> else
>>>> echo ' ';
>>>> if ($val2) { // false if at the end
>>>> // $val2['key'] contains the key
>>>> // $val2['value'] contains the value
>>>> echo $val2['key'] . '=>' $val2['value'];
>>>> }
>>>> else
>>>> echo ' ';
>>>> }
>>> Hmmz, haven't tried it, but won't the second list argument only be
>>> run when the first fails, so in essence 2 foreach loops after one
>>> another?
>>>
>>
>> Nope, both if statements are in the loop. Each time through it will
>> process $val1 then $val2.
>
> <?php
> $a = $b = array();
> for($i = 1;$i<5;$i++){
> $a[] = 'a'.$i;
> $b[] = 'b'.$i;
> }
> while(($val1 = each($a)) || ($val2 = each($b))){
> if (isset($val1) && $val1) { // false if at the end
> // $val1['key'] contains the key
> // $val1['value'] contains the value
> var_dump($val1);
> }
> else
> echo 'a not set';
> if (isset($val2) && $val2) { // false if at the end
> // $val2['key'] contains the key
> // $val2['value'] contains the value
> var_dump($val2);
> }
> else
> echo 'b not set';
> }
> ?>
> Output:
> array(4) {
> [1]=>
> string(2) "a1"
> ["value"]=>
> string(2) "a1"
> [0]=>
> int(0)
> ["key"]=>
> int(0)
> }
> b not setarray(4) {
> [1]=>
> string(2) "a2"
> ["value"]=>
> string(2) "a2"
> [0]=>
> int(1)
> ["key"]=>
> int(1)
> }
> b not setarray(4) {
> [1]=>
> string(2) "a3"
> ["value"]=>
> string(2) "a3"
> [0]=>
> int(2)
> ["key"]=>
> int(2)
> }
> b not setarray(4) {
> [1]=>
> string(2) "a4"
> ["value"]=>
> string(2) "a4"
> [0]=>
> int(3)
> ["key"]=>
> int(3)
> }
> b not seta not setarray(4) {
> [1]=>
> string(2) "b1"
> ["value"]=>
> string(2) "b1"
> [0]=>
> int(0)
> ["key"]=>
> int(0)
> }
> a not setarray(4) {
> [1]=>
> string(2) "b2"
> ["value"]=>
> string(2) "b2"
> [0]=>
> int(1)
> ["key"]=>
> int(1)
> }
> a not setarray(4) {
> [1]=>
> string(2) "b3"
> ["value"]=>
> string(2) "b3"
> [0]=>
> int(2)
> ["key"]=>
> int(2)
> }
> a not setarray(4) {
> [1]=>
> string(2) "b4"
> ["value"]=>
> string(2) "b4"
> [0]=>
> int(3)
> ["key"]=>
> int(3)
> }
>
> So, the original argument still stands: the second expression will not
> be evaluated in this conditional as long as the first will return true.
Darn, you're right - I've been in vbscript too much recently (don't ask!
:-)). And it evaluates the entire expression.
Better would be:
for ($val1 = each($a), $val2 = each($b); $val1 || $val2;
$val1 = each($a), $val2 = each($b))
Does that make you happy? :-)
--
==================
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstucklex@attglobal.net
==================
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