Even Numbers

**GamingHybrid** · August 16th, 2007, 6:44 PM

I'm back again, and this is for a modification I plan to make for my forumhome of my vBulletin software.

I've got it all mapped, except for one thing. Is there a way that I can have PHP check if, let's say, $var is a even number? (the variable value is a number).

The variable will be using the forumid numbers, and thus I want it to find every even number forumid. I know the basic layout, but I need it to check is the id is an even number or not.

I know how to do the layout of the coding, just need that php function.

Thanks in advance!

**MarkRH** · August 16th, 2007, 6:55 PM

Use the "%" modulus operator.. (remainder of $a divided by 2)

PHP Code:


			
function is_even($a)

{

  if (($a % 2) == 0) {

    return true;

  } else {

    return false;

  }

}

**GamingHybrid** · August 16th, 2007, 6:59 PM

so, I should replace $a with the variable I'm trying to check if its number is an even number, right?

Thank you MarkRH, you've been a great help like always

**MarkRH** · August 16th, 2007, 7:05 PM

Well, if you do an inline comparision, yes. Or you just call the function like:

if (is_even($myvariable)) then do whatever cause it's even.

Otherwise.. do:

if (($myvariable % 2) == 0) then do whatever cause it's even.

**GamingHybrid** · August 16th, 2007, 7:25 PM

PHP Code:


			
function is_even($forum[forumid])

{

  if (($forum[forumid] % 2) == 0) {

    return true;

    $forumbit_align = 'style="flost:right"';

  } else {

    return false;

  }

}

Using that, it comes up with:

Parse error: syntax error, unexpected '[', expecting ')' in /home/gaminghy/public_html/forums/index.php(63) : eval()'d code on line 3

**GamingHybrid** · August 16th, 2007, 7:28 PM

Is the above my variable causing the issue? If so, I know how to fix... actually, I'll try it now...

**GamingHybrid** · August 16th, 2007, 7:54 PM

i found the issue, just trying to make it work with vBulletin now. thanks Mark!

**MarkRH** · August 16th, 2007, 7:56 PM

No.. don't change that is_even function at all. All it's meant to do is evaluate if a variable passed to it is even or not and return true or false.

In your main code:

PHP Code:


			
if (is_even($forum['forumid'])) { 

    $forumbit_align = 'style="float:right"'; 

  } else { 

    do whatever because its odd 

  }

or do not use the function at all and do:

PHP Code:


			
if (($forum['forumid'] % 2) == 0) { 

    $forumbit_align = 'style="float:right"'; 

  } else { 

    do whatever because its odd 

  }

August 16th, 2007, 6:44 PM	#1 (permalink)
GamingHybrid Bow before Surpass! Super #1 Joined in Sep 2004 1,547 posts Gave thanks: 91 Thanked 49 times	Even Numbers I'm back again, and this is for a modification I plan to make for my forumhome of my vBulletin software. I've got it all mapped, except for one thing. Is there a way that I can have PHP check if, let's say, $var is a even number? (the variable value is a number). The variable will be using the forumid numbers, and thus I want it to find every even number forumid. I know the basic layout, but I need it to check is the id is an even number or not. I know how to do the layout of the coding, just need that php function. Thanks in advance! __________________ Wii Hotspot - Upcoming project! -http://www.wiihotspot.com Make a cPanel Login Form \| Why is my Account Suspended?

August 16th, 2007, 6:55 PM	#2 (permalink)
MarkRH Race Surpass Super #1 Joined in Jul 2006 Lives in Oklahoma City, OK Hosted on sh102 1,227 posts Gave thanks: 18 Thanked 86 times	Use the "%" modulus operator.. (remainder of $a divided by 2) PHP Code: `function is_even($a) { if (($a % 2) == 0) { return true; } else { return false; } }` __________________ SH102 : Mark Headrick - Blog - Gallery Pelicar \| Company of Valor \| Mysstie Wolfestar

August 16th, 2007, 6:59 PM	#3 (permalink)
GamingHybrid Bow before Surpass! Super #1 Joined in Sep 2004 1,547 posts Gave thanks: 91 Thanked 49 times	so, I should replace $a with the variable I'm trying to check if its number is an even number, right? Thank you MarkRH, you've been a great help like always __________________ Wii Hotspot - Upcoming project! -http://www.wiihotspot.com Make a cPanel Login Form \| Why is my Account Suspended?

August 16th, 2007, 7:05 PM	#4 (permalink)
MarkRH Race Surpass Super #1 Joined in Jul 2006 Lives in Oklahoma City, OK Hosted on sh102 1,227 posts Gave thanks: 18 Thanked 86 times	Well, if you do an inline comparision, yes. Or you just call the function like: if (is_even($myvariable)) then do whatever cause it's even. Otherwise.. do: if (($myvariable % 2) == 0) then do whatever cause it's even. __________________ SH102 : Mark Headrick - Blog - Gallery Pelicar \| Company of Valor \| Mysstie Wolfestar

August 16th, 2007, 7:25 PM	#5 (permalink)
GamingHybrid Bow before Surpass! Super #1 Joined in Sep 2004 1,547 posts Gave thanks: 91 Thanked 49 times	PHP Code: `function is_even($forum[forumid]) { if (($forum[forumid] % 2) == 0) { return true; $forumbit_align = 'style="flost:right"'; } else { return false; } }` Using that, it comes up with: Parse error: syntax error, unexpected '[', expecting ')' in /home/gaminghy/public_html/forums/index.php(63) : eval()'d code on line 3 __________________ Wii Hotspot - Upcoming project! -http://www.wiihotspot.com Make a cPanel Login Form \| Why is my Account Suspended?

August 16th, 2007, 7:28 PM	#6 (permalink)
GamingHybrid Bow before Surpass! Super #1 Joined in Sep 2004 1,547 posts Gave thanks: 91 Thanked 49 times	Is the above my variable causing the issue? If so, I know how to fix... actually, I'll try it now... __________________ Wii Hotspot - Upcoming project! -http://www.wiihotspot.com Make a cPanel Login Form \| Why is my Account Suspended?

August 16th, 2007, 7:54 PM	#7 (permalink)
GamingHybrid Bow before Surpass! Super #1 Joined in Sep 2004 1,547 posts Gave thanks: 91 Thanked 49 times	i found the issue, just trying to make it work with vBulletin now. thanks Mark! __________________ Wii Hotspot - Upcoming project! -http://www.wiihotspot.com Make a cPanel Login Form \| Why is my Account Suspended?

August 16th, 2007, 7:56 PM	#8 (permalink)
MarkRH Race Surpass Super #1 Joined in Jul 2006 Lives in Oklahoma City, OK Hosted on sh102 1,227 posts Gave thanks: 18 Thanked 86 times	No.. don't change that is_even function at all. All it's meant to do is evaluate if a variable passed to it is even or not and return true or false. In your main code: PHP Code: `if (is_even($forum['forumid'])) { $forumbit_align = 'style="float:right"'; } else { do whatever because its odd }` or do not use the function at all and do: PHP Code: `if (($forum['forumid'] % 2) == 0) { $forumbit_align = 'style="float:right"'; } else { do whatever because its odd }` __________________ SH102 : Mark Headrick - Blog - Gallery Pelicar \| Company of Valor \| Mysstie Wolfestar

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