For loop is not running for float values

Question

i have a for loop like below

<?php 

 for($i=0;$i<=10;$i+0.4){

 echo $i."<br>";
 }

 ?>

this code prints the value of i till 9.6 not 10.

why it returns the value of i=10 at last.

Answer 1

because of representing of float numbers for machines - http://en.wikipedia.org/wiki/Floating_point

I'd recommend to use integer indexes for loops

Answer 2

Use += to increment it, instead of just plus. As it is now, its an infinite loop for me.

Edit: For some reason PHP doesn't work properly with different types in loops.

This below should work

for($i=0;$i<=100;$i+=4){
   echo $i/10."<br>";
 }

Here's the var_dump

int(0)

float(0.4)

float(0.8)

float(1.2)

float(1.6)

int(2)

float(2.4)

float(2.8)

float(3.2)

float(3.6)

int(4)

float(4.4)

float(4.8)

float(5.2)

float(5.6)

int(6)

float(6.4)

float(6.8)

float(7.2)

float(7.6)

int(8)

float(8.4)

float(8.8)

float(9.2)

float(9.6)

int(10)

That's probably the auto-casting PHP is doing that is causing this