Useful function

[Anon]

I was thinking,
is there a function to help if the year (current or selected) is a leap year.
Low & behold, they forgot it ???

function IsLeapYear($yr){
$yy=(($yr % 4 == 0) || ($yr % 400 == 0) || ($yr % 100 == 0));
return $yy;
}

whoops 🙂

[Anon]

Well hotshot why not just:
function IsLeapYear($yr){
return (($yr % 4 == 0) || ($yr % 400 == 0) || ($yr % 100 == 0));
}

[Anon]

The function should be :

function IsLeapYear($yr)
{
return ($yr % 4 == 0) && (($yr % 400 == 0) || ($yr % 100 != 0));
}

Multiples of 100 are NOT leap unless multiples of 400 (which is the case of 2000).

Another possibility is simply :

function IsLeapYear($yr)
{
return checkdate(2,29,$yr);
}

[Anon]

Ok, ok you got me on both counts..

shouldn't we (int) the num too ??

[Anon]

I also thought it was useful & Rasmus & The others @ the php project just overlooked it 🙂

There's a few others too....

isEven - return (abs((int) $value) % 2 == 0) ? true : false;

isOdd - return (isEven($num)) ? false : true;

insert_str -

function insert_str($substring,$source,$position){
$left=substr($source,0,$position);
$right=substr($source,$position+1,strlen($source));
return $left.$substring.$right;
} # end function

I thought these wre a few ....

[Anon]

or
function insert_str($substring,$source,$position){
return substr($source,0,$position).$substring.substr($source,$position+1,strlen($source));
}

[Anon]

Sorry again, but you have in PHP4 the wonderful substr_replace() function :

function insert_str($substring,$source,$position)
{
return substr_replace($source,$substring,$position,0);
}

[Anon]

Yeah but I was thinkking of those who might still be running 3.x