[SOLVED] maths madness...

[redarrow]

 

why dosent this work please.

 

i no the array_dif but what wrong with this please?

 

<?php

$numbers=array("1","2","3","4","5");

$numbers_not_wanted=array("3","5");

for($i=0; $i<count($numbers); $numbers_not_wanted++, $i++){

if($numbers[$i]==$numbers_not_wanted[$i])

continue;

echo $numbers[$i];


}

?>

[Alex]

I'm assuming you want something like this:?

 

$numbers=array("1","2","3","4","5");
$numbers_not_wanted=array("3","5");

for($i = 0;$i < count($numbers);$i++)
{
     if(in_array($numbers[$i], $numbers_not_wanted))
          continue;
     echo $numbers[$i];
}

 

Assuming I'm right in guessing (Because you didn't specify what you want..) the reason yours didn't work is because you were only comparing the current element of $numbers to one element of  $numbers_not_wanted.

 

If I'm completely wrong then tell me what you really wanted.

[redarrow]

here a php.net example of continue....

<?php
for ($i = 0; $i < 5; ++$i) {
    if ($i == 2)
        continue
    print "$i\n";
}
?>

 

why didn't mine work i no the in_array way!

 

why didn't mine work like php.net example please....

 

please exsplin in depth.

the reason yours didn't work is because you were only comparing the current element of $numbers to one element of  $numbers_not_wanted.

[Mark Baker]

It doesn't work because you're looping through the array indexes, assuming that they're the same as the index values.

 

$numbers=array("1","2","3","4","5");

gives array(0 => '1', 1 => '2', 2 => '3', 3 => '4', 4 => '5')

 

$numbers_not_wanted=array("3","5");

gives array(0 => '3', 1 => '5')

 

 

$i=0; $numbers_not_wanted (not even set in first pass of loop, defaults to 0)

$numbers[0] = '1'

$numbers_not_wanted[0] = '3'

The two don't match

 

$i=1; $numbers_not_wanted = 1;

$numbers[1] = '2'

$numbers_not_wanted[1] = '5'

The two don't match

 

$i=2; $numbers_not_wanted = 2;

$numbers[2] = '3'

$numbers_not_wanted[2] doesn't exist

The two don't match

 

etc.

[Daniel0]

You'd also (in this case) get three E_NOTICEs.

[redarrow]

Thank you all .......

 

 

alexwd your a grate programmer, and good help to php freaks , but mate loads off people always want to no why your solution works, so why not just tell them there and then, ur solution in words to your answer off php, cheers.

 

i no it a pain to type your solutions, but as a master i am sure, you can short and sweet.

 

 

[Alex]

Sorry, I usually try to explain my solutions, as I was writing that I was about to go do something so I was kind of rushing.