While loops in PHP execute a block of code repeatedly as long as a specified condition remains true. The while loop checks the condition before each iteration, whereas the do...while loop checks the condition after running the code block at least once. This document provides an example of using a while loop to print the numbers 0 through 4.

1. WHILE LOOPS

2. • PHP while loops execute a block of
code while the specified condition is
true.
• while (condition is true) {
code to be executed;
}

3. • Print 0-4 on the screen.

4. • 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.