3.4.3 For Loop

The PHP for Loop

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

Syntax

for (init counter; test counter; increment counter) {
  code to be executed for each iteration;
}

• Parameters:
  • init counter: Initialize the loop counter value
  • test counter: Evaluated for each loop iteration. If it evaluates to TRUE, the loop continues. If it evaluates to FALSE, the loop ends.
• increment counter: Increases the loop counter value

Examples

The example below displays the numbers from 0 to 10:

Example 1: PHP Loops - The PHP for Loop part 1

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

Example Explained

• $x = 0; - Initialize the loop counter ($x), and set the start value to 0
• $x <= 10; - Continue the loop as long as $x is less than or equal to 10
• $x++ - Increase the loop counter value by 1 for each iteration

This example counts to 100 by tens:

Example 2: PHP Loops - The PHP for Loop part 2

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

Example Explained

• $x = 0; - Initialize the loop counter ($x), and set the start value to 0
• $x <= 100; - Continue the loop as long as $x is less than or equal to 100
• $x+=10 - Increase the loop counter value by 10 for each iteration