PHP while loop -types of loop, while loop syntax

PHP while loop execute a multiple statements repeatedly until while expression is true.

Syntax of while loop:

Following is given a general syntax of while loop in PHP:

while(condition)
{ 

  // statement;

}

while(condition)

{

// statement;

}

The multiple statements inside while loop get executed only when expression is true.
These multiple statements enclosed within the curly braces or using the alternate syntax:
Initially if while condition is true then only while statements will execute otherwise they will not execute at even once.

while(condition):
      statement
	  ...
endwhile;

while(condition):

statement

...

endwhile;

Flowchart of PHP while loop

PHP-while-loop

Example

<?php
  $a = 0;
  while($a <= 5)
  {
    echo "a = $a<br>";
	$a++;
  }
?>

<?php

$a = 0;

while($a <= 5)

{

echo "a = $a<br>";

$a++;

}

Output:

a = 0
a = 1
a = 2
a = 3
a = 4
a = 5

a = 0

a = 1

a = 2

a = 3

a = 4

a = 5

Or you can use while loop as following:
It will print same output as above example only we use endwhile instead curly braces { }.

<?php
  $a = 0;
  while($a <= 5):
     echo "a = $a<br>";
	 $a++;
  endwhile;
?>