The obvious solution

So if you’re in an exam, the answer would be

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for ($i=0; $i<=5; $i++)
{
  echo $i;
}

but where’s the fun in that?! Below are various different ways of doing the same thing. They all work.
They’re all correct. They’re just not what you’d do.

Using an array

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for ($i=range(0,5),$k=$j=count($i);$j>=0;$j--)
{
	echo $i[$k-$j];
}

Outputting chars

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for ($i=48; $i < 54; $i++)
{
  echo chr($i);
}
 
// or even better!
for ($i=48; $i<=53; print_r(chr($i++)));

Using a string to count

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for ($i=0, $s=''; $i<6; $s.=' ', $i++)
{
	echo strlen($s);
}

Using bitwise operators

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for ($i=1;$i<64; $i=$i<<1)
{
	echo log($i,2);
}

The know it all method

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for (;;)
{
	echo 'the numbers 0 to 5'; break;
}

more?

What other ways can you think of to output the numbers 0 to 5 using a for loop?