PHP For Loop - PHP Tutorial

The for loop in PHP is a versatile tool for running a block of code a specified number of times. It’s ideal when the number of iterations is predetermined.

Syntax

for (initialization; condition; increment) {
  // code block
}

PHP
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for (initialization; condition; increment) {  // code block}

Initialization: Executes once at the start, setting the initial state.
Condition: Checked before every iteration; the loop runs as long as this evaluates to true.
Increment: Executes after each iteration, often used to update the counter variable.

Example: Motorcycle Model Numbers

This example displays motorcycle model numbers from 0 to 10:

for ($model = 0; $model <= 10; $model++) {
  echo "Motorcycle model: $model <br>";
}

PHP
 
for ($model = 0; $model <= 10; $model++) {  echo "Motorcycle model: $model <br>";}

Explanation:

$model = 0; initializes the counter variable $model to 0, establishing the starting point of the loop.
$model <= 10; checks whether the value of $model is less than or equal to 10 before each iteration. If true, the loop proceeds; otherwise, it stops.
$model++; increments the counter variable $model by 1 after each loop iteration, allowing the loop to advance towards its stopping point.

This ensures that the script outputs all motorcycle model numbers from 0 to 10 in sequence.

The break Statement

The break statement can be used to terminate the loop early. For instance, stop the loop when the motorcycle model reaches 3:

for ($model = 0; $model <= 10; $model++) {
  if ($model == 3) break;
  echo "Motorcycle model: $model <br>";
}

PHP
 
for ($model = 0; $model <= 10; $model++) {  if ($model == 3) break;  echo "Motorcycle model: $model <br>";}

The continue Statement

The continue statement allows skipping the current iteration and moving on to the next. In this example, skip the model corresponding to Honda (represented as 3):

for ($model = 0; $model <= 10; $model++) {
  if ($model == 3) continue;
  echo "Motorcycle model: $model <br>";
}

PHP
 
for ($model = 0; $model <= 10; $model++) {  if ($model == 3) continue;  echo "Motorcycle model: $model <br>";}

Custom Increment Steps

You can modify the increment value to suit specific needs. For example, count motorcycle production batches in steps of 10:

for ($batch = 0; $batch <= 100; $batch += 10) {
  echo "Production batch: $batch <br>";
}

PHP
 
for ($batch = 0; $batch <= 100; $batch += 10) {  echo "Production batch: $batch <br>";}