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PHP For Loop

A for loop repeats a block of code for a counted number of rounds. Its counter moves in steps until a test turns false.

Counting from 0 to 4

The counter starts at 0. The loop prints each value up to 4.

<?php
for ($i = 0; $i <= 4; $i++) {
  echo $i . "\n";
}

A step of 2

The step adds 2 after each round. The printed values jump by two each time.

<?php
for ($i = 0; $i <= 8; $i += 2) {
  echo $i . "\n";
}

A sum built in a for loop

The total starts at 0. Each round adds the counter to the total, and the sum prints after the loop.

<?php
$total = 0;
for ($i = 1; $i <= 5; $i++) {
  $total += $i;
}
echo $total . "\n";

Example

<?php
for ($i = 2; $i <= 10; $i += 2) {
  echo $i . "\n";
}

Key points

  • The for header holds the start, the test and the step in one line.
  • The start sets the counter before the first round.
  • The test runs before each round.
  • The step runs after each round and changes the counter.
  • A for loop suits a job with a counted number of rounds.

In this example, the counter starts at 2. The step adds 2 after each round. The loop prints the even numbers from 2 to 10, one per line.

Try it Yourself

Edit the code, then press Run.

Running is simulated · Programiz PHP Compiler

Exercise

In a for header, what runs after each round?