Home / Core PHP / PHP 5 while Loops

PHP 5 while Loops

PHP while loops execute a block of code while the specified condition is true.

PHP Loops
Often when you write code, you want the same block of code to run over and over again in a row. Instead of adding several almost equal code-lines in a script, we can use loops to perform a task like this.

In PHP, we have the following looping statements:

while – loops through a block of code as long as the specified condition is true
do…while – loops through a block of code once, and then repeats the loop as long as the specified condition is true
for – loops through a block of code a specified number of times
foreach – loops through a block of code for each element in an array
The PHP while Loop
The while loop executes a block of code as long as the specified condition is true.

Syntax

while (condition is true) {
code to be executed;
}
The example below first sets a variable $x to 1 ($x=1;). Then, the while loop will continue to run as long as $x is less than, or equal to 5. $x will increase by 1 each time the loop runs ($x++;):

Example

Select Code
<?php 
$x=1; 

while($x<=5) {
  echo "The number is: $x <br>";
  $x++;
} 
?>

The PHP do…while Loop
The do…while loop will always execute the block of code once, it will then check the condition, and repeat the loop while the specified condition is true.

Syntax

do {
code to be executed;
} while (condition is true);
The example below first sets a variable $x to 1 ($x=1;). Then, the do while loop will write some output, and then increment the variable $x with 1. Then the condition is checked (is $x less than, or equal to 5?), and the loop will continue to run as long as $x is less than, or equal to 5:

Example

Select Code
<?php 
$x=1; 

do {
  echo "The number is: $x <br>";
  $x++;
} while ($x<=5);
?>

Notice that in a do while loop the condition is tested AFTER executing the statements within the loop. This means that the do while loop would execute its statements at least once, even if the condition fails the first time.

The example below sets the $x variable to 6, then it runs the loop, and then the condition is checked:

Example

Select Code
<?php 
$x=6;

do {
  echo "The number is: $x <br>";
  $x++;
} while ($x<=5);
?>

About v.shakya

I am V.Shakya, Freelance PHP Programmer. I like to share my ideas, views and knowledge to all of you who come across my website. I am young, enthusiastic, highly motivated and self disciplined person. I completed my studies in Master of Computer Application and currently giving my technical expertise to one of the Big IT company. I have more than Ten years of experience in vast field of Programming , Designing and Development of websites and various software's.

Check Also

PHP 5 Arrays

An array stores multiple values in one single variable: Example <?php $cars=array("Volvo","BMW","Toyota"); echo "I like …

Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.