Do While Loop - PHP - P30

A regular while loop will skip over the loop body if the expression that’s evaluated is never true. But what if we need the contents of the body to be executed at least once? That’s what the do-while loop does for us.

$will_execute = false;

while ( $will_execute ) {
echo "I will execute at least once";
}

Looking at the code above, the while loop will never execute since the expression is always false. PHP will just skip over it. In this example, we want the statement to execute at least once. We want PHP to display “I will execute at least once” regardless of whether the expression evaluates to true or not.

As a recap, the way that the while loop is processed is as follows:
- PHP tests the expression inside of the while loop.
- If true, execute the code inside of the loop body. Go back to 1 and repeat.
- If false, exit the loop and continue code execution after the loop’s closing curly brace.

The do-while loop flips 1 and 2. It starts by executing the content inside of the loop body and then tests the condition. Even if the condition is false, the code inside of the loop body has already been executed once. If the condition is true, it executes the content inside of the loop body again and keeps repeating the process until the loop expression is evaluated to false.

The do-while loop has the following structure:

do {
code to execute
} while ( expression );

Read the full article on my website
https://www.dinocajic.com/php-do-while-loop/

Code for this tutorial
https://github.com/dinocajic/php-7-youtube-tutorials/blob/master/30%20Do%20While.php

Full Code
https://github.com/dinocajic/php-7-youtube-tutorials

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Dino Cajic
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