Description:
------------
Suppose I want to build a string with fixed length (for whatever reason) by appending a number to a string.

//I want strings like 'foo0001','foo0002','foo0010' etc
for ($i=1;$i<1000;$i++)
{
    $string = 'foo'.$i;
}
strval could be useful IF it accepted a second (int) parameter to tell it: 
    "This number will have <int parameter> characters in string form,fill it to the left with zeroes"

With this behaviour,this would work:
for ($i=1;$i<1000;$i++)
{
    $string = 'foo'.strval($i,4);//This would give me '0001'
}
What about floats? Another parameter.

Explained by example:
for ($i=1;$i<1000;$i++)
{
    $string = 'foo'.strval($i,4,3);//This would give me '0001.000'
}

For completeness:
$number = 123456789;
$string = 'bignumber: '.strval($number,5);
Will result in the string 'bignumber123456789', since I asked for less characters than the number has.