looping reverse

[9three]

Hey,

 

I have a variable that holds an integer. I would like to get the values before that value but I'm having an issue.

 

$current = 7;

for($x = $current - 1; $x <= $current - 1 && $x > 0; --$x)
  echo $x;

 

Output is: 654321

 

What I need is 123456.

 

My eyes hurt, can someone help?

[Aeglos]

You are thinking all backwards. You want the values FROM one and UP TO your defined boundary, just do:

 

for ($x = 1; $x < $current; $x++) {
    echo $x;
}

 

So you loop from 1 up to one less than your $current value (that's why you use '<' instead of '<='). That should output 123456 if $current is 7.

[9three]

That won't work.

 

If I'm on page 14, then I would need the last 5 values before 14.

 

Output would be 13, 12, 11, 10, 9

 

If I use yours then it would always be 1, 2, 3, 4, 5

[Alex]

<?php
$current = 14;
for($i = $current - 1;$i >= $current - 5 && $i > 0;$i--)
{
echo $i . "<br />\n";
}

[Aeglos]

I see now what you are attempting; getting the previous five integers.

 

for ($x = $current-5; $x < $current; $x++) {
    if ($x < 1) {
        $x = 1;
    }
    echo $x;
}

 

That will give you the previous 5 integers before $current. Note the if() which is important if $current is lower than 5.

 

Cheers.

[9three]

ah perfect!

 

thank you

[9three]

Actually I take that back. I went with your code Alex and it displays it wrong.

 

if current is 14 then output is:

 

13 12 11 10 9 14

 

It should be:

 

9 10 11 12 13 14

[9three]

Ok I figured it out with the code you guys provided.

 

Here is what I did. Any recommended improvement is always accepted

 

$current = 16;
if ($current <= 5) {
  for($i = 1;$i < $current; $i++) {
    echo $i.' ';
  }
}
else {
  for($i = $current - 5;$i <= $current - 1 && $i > 0; $i++) {
    echo $i.' ';
  }
}
echo ' Current:'.$current;

[lathifmca]

hi 9three,

 

i m a newbie here, try this coding, this will help u for improvement 

 

<?php

$x = 16;

for( $i= $x-5; ($i < $x) && ($i > 0) ; $i++ )

{

echo $i." ";

}

echo $x;

?>

[9three]

It's about the same except you dont have a less than or equal to.

 

But thank you anyway.

[lathifmca]

hmm.. s, but in the above your code, u r checking an IF ELSE condition, that is unneccessary.. so that i replied that code... thats all...

[9three]

Your code does not work if the x is less than 5, that's why I check if its less than 5. If it is, then I do a different for loop.

[lathifmca]

oh right.. my mistake..