How to specify number of digits in a float number in php?

Question

The number is: 1234.56789 or maybe '-1234.56789'

What is the php function to specify we have 4 digits before . and 5 digits after . ?

Something like this:

intNumber(1234.56789);   //4
floatNumber(1234.56789); //5

Edit: Actually I want to check if this number has 4 digits before (.) and 5 digits after (.). If yes I save it to database, and if not, I don't save it in the database.

Answer 1

Make use of the round() in PHP with an extra parameter called precision.

<?php
echo round(1234.56789,4); //"prints" 1234.5679
                    //^--- The Precision Param

EDIT :

Thanks a lot. Actually I want to check if this number has 4 digits before (.) and 5 digits after (.). If yes I save it to database, and if not, I don't save it in the database.

This one is a bit hacky though..

<?php

function numberCheck($float)
{
    $arr=explode('.',$float);
    if(strlen(trim($arr[0],'-'))==4 && strlen($arr[1])==5)
    {
        return 1;
    }
    else
    {
        return 0;
    }
}

if(numberCheck(1234.56789))
{
    echo "You can insert this number !";
}
else
{
    echo "Not in the correct format!";
}