Find nearest real number

[gosman]

I need a function to find the nearest real number.

I found the following code but it only allows for integers.

$match = 58;

$set = array(1,2,3,5,8,13,21,34,55,89,144,233,377,54);

foreach ($set as $fib)
{
$diff[$fib] = (int) abs($match - $fib);
}
$fibs = array_flip($diff);
$closest = $fibs[min($diff)];

echo $closest;

Any help really appreciated.

[Readie]

Are you trying to find the number defined in the array that is closest to $match?

If so:

$match = 58;

$set = array(1,2,3,5,8,13,21,34,55,89,144,233,377,54);

foreach($set as $fib){
if($fib <= $match) {
$num = ($match - $fib);
} else {
$num = ($fib - $match);
}
$new_set[$fib] = $num;
}

$val = min($new_set);
$key = array_search($val, $new_set);
echo $key;

[gosman]

Thanks Readie for you reply.

Your code works great if the numbers are integers, however in my real life scenario the number could be a float number.

See below

$match = 58.5;

$set = array(1,2,3,5,8,13,21,34,55,89,144,233,377,54,58.3);

foreach($set as $fib){
if($fib <= $match) {
$num = ($match - $fib);
} else {
$num = ($fib - $match);
}
$new_set[$fib] = $num;
}

$val = min($new_set);
$key = array_search($val, $new_set);
echo $key;

Any suggestions?

[Readie]

If you put quotes around floats it works fine, like:

$set = array(1,2,3,5,8,13,21,34,55,89,144,233,377,54,'59.3');

[gosman]

Excellent.

Thank you Readie

[Matthew1980]

Hi there,

When doing an array like that, you should put the quotes in anyway, at least thats my understanding of it, It will work without, but it's good coding practice to use the quotes. It's only when placing a $var in that you don't use quotes.

Cheers,

MRb