php numbers like (10M, ..) - php

Question

I would like to work with numbers like 10M (which represents 10 000 000), and 100K etc. Is there a function that already exists in PHP, or do I have to write my own function?
I'm thinking something along the lines of :
echo strtonum("100K"); // prints 100000
Also, taking it one step further and doing the opposite, something to translate and get 100K from 100000?

Answer 1

You could whip up your own function, because there isn't an builtin function for this. To give you an idea:
function strtonum($string)
{
$units = [
'M' => '1000000',
'K' => '1000',
];
$unit = substr($string, -1);
if (!array_key_exists($unit, $units)) {
return 'ERROR!';
}
return (int) $string * $units[$unit];
}
Demo: http://codepad.viper-7.com/2rxbP8
Or the other way around:
function numtostring($num)
{
$units = [
'M' => '1000000',
'K' => '1000',
];
foreach ($units as $unit => $value) {
if (is_int($num / $value)) {
return $num / $value . $unit;
}
}
}
Demo: http://codepad.viper-7.com/VeRGDs
If you want to get really funky you could put all that in a class and let it decide what conversion to run:
<?php
class numberMagic
{
private $units = [];
public function __construct(array $units)
{
$this->units = $units;
}
public function parse($original)
{
if (is_numeric(substr($original, -1))) {
return $this->numToString($original);
} else {
return $this->strToNum($original);
}
}
private function strToNum($string)
{
$unit = substr($string, -1);
if (!array_key_exists($unit, $this->units)) {
return 'ERROR!';
}
return (int) $string * $this->units[$unit];
}
private function numToString($num)
{
foreach ($this->units as $unit => $value) {
if (is_int($num / $value)) {
return $num / $value . $unit;
}
}
}
}
$units = [
'M' => 1000000,
'K' => 1000,
];
$numberMagic = new NumberMagic($units);
echo $numberMagic->parse('100K'); // 100000
echo $numberMagic->parse(100); // 100K
Although this may be a bit overkill :)
Demo: http://codepad.viper-7.com/KZEc7b

Answer 2

For second one
<?php
# Output easy-to-read numbers
# by james at bandit.co.nz
function bd_nice_number($n) {
// first strip any formatting;
$n = (0+str_replace(",","",$n));
// is this a number?
if(!is_numeric($n)) return false;
// now filter it;
if($n>1000000000000) return round(($n/1000000000000),1).' trillion';
else if($n>1000000000) return round(($n/1000000000),1).' billion';
else if($n>1000000) return round(($n/1000000),1).' million';
else if($n>1000) return round(($n/1000),1).' thousand';
return number_format($n);
}
?>