while()
for();
do...while()
foreach() // PHP4 Only

<?php
 $i= 0; // on define a variable and give the zero value to it.
while ( $i <= 4 ) // the loop will stop when $i equal 4

{
print 'round number '.$i.'<br />'; 
// we display this phrase with each current number of $i.
$i++; // the ++ ($i= $i +1;) means that we add 1 each...
//round of the loo, do not forget if else the... 
//loop will be infinite and it will show an error!
} 

?>

<?php
or ($i=0;$i<=4;$i++) // it's the same example when we used (while),... 
//but the advantage of for() is you get all the code... 
//in the same line, that avoids the incrementing of the counter

{
print 'round number '.$i.'<br />'; 
// we display this phrase with the number of the round.
}  
?>

<?php 
$i=0;
do
  {
  $i++;
  echo "The number is " . $i . "<br />";
  }

while ($i<5);
?>
?>

<?php
$arr=array("one", "two", "three");

foreach ($arr as $value)
{
  echo "Value: " . $value . "<br />";

}
?>