Overview: Understanding how to use looping in our code introduction to While Loops

The ability to add logic in a script is the first fundamental part of any true programming language, but then the ability to execute the same code multiple times is also very important.

Imagine you had to print the number from 1 to 20 you could echo it from 1....20 or we can write a simple while loop that does the job.


Introducing the While Loop
while loops are the simplest type of loop in PHP. It tells PHP to execute the nested statement(s) repeatedly, as long as the while expression evaluates to TRUE.

The syntax of a while loop

While(conditions)
{
// This code will execute until the conditions
// provided no longer evaluates to true
}


Let's do a simple while loop example that prints the numbers from 1 to 10.

<?php

$cnt = 1;
while($cnt != 11)
{
echo "$cnt
";
$cnt = $cnt + 1;
}
?>


Understanding the above example: In the above example we have created a variable $cnt and assigned it an value of 1, then we added the while loop.

We said to the while loop to continue the loop until $cnt != 11 means that the loop should continue until $cnt reaches 11, then we print the value of $cnt, after that we increment the value of $cnt by one, the loop checks the value of $cnt if its not equal to 11 it continues the loop, when finally $cnt reaches 11 the loop exits.

Let's make a simple multiplication table using While Loop

<?php
$table = 5; //we will use the multiplication table 5
$cnt = 1;

while($cnt != 11)
{
echo "
$table x $cnt = ". $table * $cnt;
$cnt++;
}
?>