PHP For Loop Tutorial

Learn about the PHP for loop, but before going further you should first learn –

  1. Operators in PHP (Including Comparison, Logical, Increment, and Decrement Operators)
  2. Conditional statements in PHP
  3. what are the PHP Loops?

The PHP For Loop is used to execute a block of code for a specified number of times.

PHP For Loop Syntax

<?php
for(Initialization; Condition; Increment or Decrement){
    // Statement
}
?>

The PHP for loop takes three expressions (initialization, condition, and increment) and the expressions are separated by a semicolon (;).

  • Initialization – It is used to set the loop counter value. Basically, this expression takes a variable which value is always a number (This is the number from where the count begins).
  • Condition – The condition decides how many times the loop will run. Basically, your loop will run continuously until your condition is false.
  • Increment or Decrement – It is used to Increment or Decrement the counter value (the counter value will increase or decrease according to the number of times the loop runs.)

How does work the PHP For loop?

How does work the PHP For loop?

Example of For Loop

The example displays the numbers from 1 to 3.

<?php
for($variable = 1; $variable < 4; $variable++){

    echo $variable.'<br>';

}
?>
Browser Output
1
2
3

Explanation:

When the Loop Starts –

  1. $variable = 1 – First, it sets the counter value from where the count begins. The value is 1. This means that the count starts from 1.
  2. $variable < 4 – Then it checks the condition. The condition is $variable is less than 4. The $variable is 1, this means 1 is less than 4 and it is true so this loop will run.
  3. $variable++ – After that, it increase the $varriable value ($varriable + 1 = 2). To understand this, you must have to learn about PHP Increment and Decrement Operators.

Second time Loop:

  1. After increasing the $variable, Now $variable value is 2.
  2. $variable < 4 – Then it checks the condition again. Now at this time, the $variable value is 2. So our condition is – 2 is less than 4, and the condition is true so this loop will run.
  3. $variable++ – After that, it increase the $variable (2) value again ($variable + 1 = 3).

Third-time Loop:

  1. In the third time, the $variable value is 3.
  2. Then it checks the condition again, and the condition is – 3 is less than 4 and this is true so this loop will run.
  3. After that, it increase the $variable (3) value again ($variable + 1 = 4).

Fourth-time Loop:

  1. In the fourth time, the $variable value is 4.
  2. Then it checks the condition again, and the condition is – 4 is less than 4 and the condition is false so this loop will be closed.

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