The for loop - Loops through a block of code a specified number of times.

The PHP for Loop

The for loop is used when you know how many times the script should run.

Syntax

for (expression1, expression2, expression3) {
  // code block
}

This is how it works:

• expression1 is evaluated once
• expression2 is evaluated before each iteration
• expression3 is evaluated after each iteration

for ($x = 0; $x <= 10; $x++) {
  echo "The number is: $x <br>";
}

Example Explained

1. The first expression, $x = 0;, is evaluated once and sets a counter to 0.
2. The second expression, $x <= 10;, is evaluated before each iteration, and the code block is only executed if this expression evaluates to true. In this example the expression is true as long as $x is less than, or equal to, 10.
3. The third expression, $x++;, is evaluated after each iteration, and in this example, the expression increases the value of $x by one at each iteration.

The break Statement

With the break statement we can stop the loop even if the condition is still true:

for ($x = 0; $x <= 10; $x++) {
  if ($x == 3) break;
  echo "The number is: $x <br>";
}

The continue Statement

With the continue statement we can stop the current iteration, and continue with the next:

for ($x = 0; $x <= 10; $x++) {
  if ($x == 3) continue;
  echo "The number is: $x <br>";
}

Step 10

This example counts to 100 by tens:

for ($x = 0; $x <= 100; $x+=10) {
  echo "The number is: $x <br>";
}

PHP Exercises

 ($i = 0; $i < 10; ) {
  echo $i;
}