Key Concepts

Review core concepts you need to learn to master this subject

PHP while loops

PHP do while loops

PHP for loop

PHP foreach loop

PHP break keyword

PHP continue keyword

PHP for loop shorthand

PHP foreach loop shorthand

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PHP while loops

// This while loop counts from 0 to 100
$count = 0;
while ($count <= 100)
{
  echo "The count is: " . $count . "\n";
  $count += 1;
}

In PHP, while loops repeat execution of their code block as long as their conditional statement is true.

The syntax for a while loop is:

while (/*conditional*/) {
  #code block
}
Loops
Lesson 1 of 2
  1. 1
    Why Use Loops?
    When attempting to repeat code over and over again, it can be monotonous to retype or copy and paste the same code. Worse, inadvertent typos can cause errors in your program. Consider an example w…
    Start
  2. 2
    while
    The first PHP loop that we will cover is the while loop. This type of loop continues to iterate as long as its conditional is true. This code outputs the numbers from 1-10, similar to the previous…
    Start
  3. 3
    do while
    A do…while loop is very similar to a while loop. The main difference is that the code block will execute once without the conditional being checked. After the first iteration, it behaves the same…
    Start
  4. 4
    for
    A for loop is commonly used to execute a code block a specific number of times. for (#expression 1; #expression 2; #expression 3) { # code block } The for loop syntax includes 3 expressions: - …
    Start
  5. 5
    foreach
    The foreach loop is used for iterating over an array. The code block is executed for every element in the array and the value of that element is available for use in the code block. Our counting t…
    Start
  6. 6
    break and continue
    Similar to switch statements, the break keyword can be used to terminate any of the loop types early. In our counting example of a while loop, if we add a conditional and a break statement: $count …
    Start
  7. 7
    Review
    Now you have the ability to repeat execution of code blocks as necessary in your PHP programs. Here is a summary of the topics covered in this lesson: - while loops execute only as long as their c…
    Start

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