9.Control Structure (Loop)

Loop Structure

For loop

Syntax:

for (init; condition; increment)

{

   statements;

}

for (init; condition; increment):

  statements;

endfor;

Example:

<?php

$s=0;

echo "sum = ";

  for($i=1;$i<=5;$i++)

  {

    $s =$s + $i;

    $op=$i>4?"= " : "+ ";

    echo $i ." ". $op;

  }

​​  echo  $s;

?>

While loop

Syntax:

<?php

while (condition)

{

 statements;

 increment;

}

?>

example

<?php

$s=0; $i = 1;

echo "sum = ";

while($i<=5)

{ 

 $s =$s + $i;

 $op=$i>4?"= " : "+ ";

 echo $i ." ". $op;

 $i++;

}

echo $s;

?>

do...while Statement

Syntax:

<?php

do{

 statements;

}

?>

example

<?php

$i=5;

do

 {

   echo "Hello World !";

   $i++;

 }while($i<=7);

?>

Understanding Break,Continue and Exit

Break

Break used to leave the Loop.

Continue

Continue for further processing Loop nothing under it does not work.

Exit

Exit For End Process Code.