Loops in PHP

Loops

In this tutorial we will study about Loops in php and learn how we can use it for different purposes. So let start by asking a simple question i.e. what is a loop?  In general English we say a loop is doing same things again and again until we satisfied with the result.

For e.g. listen a music repeatedly, switching on and off of the fan

Now in php we have  four syntax are there using which can instruct the php to execute bunch of statements again  and again. So let see what they are?
          a) for loop
          b) while loop
          c) do-while loop
          d) do loop

Now we will looking the most used loops which are “for” and “while” loops.

FOR LOOP

first of all let know about syntax i.e. how we can write the loop
          syntax:
                   for(initialization ; condition ; increment/decrement)
                   {
                             //body goes here

                   }
let start with simple understanding:
  for: This thing refers to the English word “for”.
  Initialization: This refers to the first value of the variable to which it is
  initialized.
 
  condition: This is the condition using which a loop continue its work i.e. if the
  condition will be true than loop will continue but if false than loop will be break
  out. 
  Increment/decrement: This part of the loop is used to bring the value of
  the variable to the condition to value on which the loop will stop iterating.

Now let’s take an example of for loop:
         

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

                                      echo $i.” ”;

                             }
Output : 0 1 2 3 4 5 6 7 8 9 10

WHILE LOOP
The working of this loop is same as it as FOR loop but the syntax is differed. Let’s see the syntax:
          SYNTAX:
                  
                   Initialization
                   while(condition){
                             //Statements or body
                             increment/decrement
                   }
eg.
                   $i=0;
                   while ($i<=10) {
                             echo $i;
                             $i++; }
Output : 0 1 2 3 4 5 6 7 8 9 10