RAMAKAYAL COMPUTER EDUCATION

Author: Saravana Kumar

  • PHP Basics in Tamil: Loops (for, while, do-while, foreach)

    Part 1 – For Loop

    • For Loop – To Repeat no of Times.
    • Syntax:
    <?php
for($i = 1; $i <= 5; $i++){
    echo "Number: $i <br>";
}
?>
    • Output: 1,2,3,4,5

    Part 2 – While Loop

    • While Loop condition true இருக்கும் வரை repeat செய்யும்.
    <?php
$i = 1;
while($i <= 5){
    echo "Number: $i <br>";
    $i++;
}
?>

    Part 3 – Do-While Loop

    • Do-While Loop குறைந்தது ஒரு முறை code execute செய்யும்.
    <?php
$i = 1;
do{
    echo "Number: $i <br>";
    $i++;
} while($i <= 5);
?>

    Part 4 – Foreach Loop

    • Foreach Loop mainly arrays iterate செய்ய பயன்படும்.
    <?php
$colors = array("Red","Green","Blue");
foreach($colors as $color){
    echo "Color: $color <br>";
}
?>

    Part 5 – Real-life Example

    • Array values display
    • Table rows iterate
    • Invoice items repeat
    <?php
$items = array("Pen"=>10,"Book"=>5,"Notebook"=>7);
foreach($items as $item => $qty){
    echo "$item quantity: $qty <br>";
}
?>

  • PHP Basics in Tamil: Conditional Statements (if, else, elseif, switch)

    Part 1 – If Statement

    • If statement என்பது ஒரு condition true ஆக இருந்தால் code execute செய்யும்.
    • Syntax:
    <?php
$age = 18;
if($age >= 18){
    echo "You are eligible to vote.";
}
?>

    Part 2 – If-Else Statement

    • Condition true/false இருவரையும் handle செய்ய If-Else பயன்படுத்தலாம்.
    • Example:
    <?php
$age = 16;
if($age >= 18){
    echo "You can vote.";
} else {
    echo "You are not eligible to vote.";
}
?>

    Part 3 – Elseif Statement

    • Multiple conditions handle செய்ய Elseif பயன்படுத்தலாம்.
    • Example:
    <?php
$marks = 75;
if($marks >= 90){
    echo "Grade A";
} elseif($marks >= 75){
    echo "Grade B";
} elseif($marks >= 50){
    echo "Grade C";
} else {
    echo "Fail";
}
?>

    Part 4 – Switch Statement

    • Switch statement variable மதிப்பை பரிசீலிக்க உதவும்.
    • Example:
    <?php
$day = 3;
switch($day){
    case 1:
        echo "Monday";
        break;
    case 2:
        echo "Tuesday";
        break;
    case 3:
        echo "Wednesday";
        break;
    default:
        echo "Invalid day";
}
?>

    Part 5 – Real-life Example

    • Age check for eligibility
    • Grade calculation
    • Menu selection

    Example combining If-Else and Switch:

    <?php
$age = 20;
$day = 2;

if($age >= 18){
    echo "You can vote.<br>";
} else {
    echo "You cannot vote.<br>";
}

switch($day){
    case 1:
        echo "Today is Monday";
        break;
    case 2:
        echo "Today is Tuesday";
        break;
    default:
        echo "Invalid day";
}
?>

  • PHP Operators & Expressions | PHP Tutorial in Tamil

    Part 1 – Arithmetic Operators

    • + Addition, – Subtraction, * Multiplication, / Division, % Modulus
    • Example:
    <?php
$a = 10;
$b = 3;

echo $a + $b; // 13
echo $a - $b; // 7
echo $a * $b; // 30
echo $a / $b; // 3.3333
echo $a % $b; // 1
?>

    Part 2 – Assignment Operators

    • *=, +=, -=, =, /=
    • Example:
    <?php
$x = 5;
$x += 3; // x = x + 3, result: 8
$x *= 2; // x = x * 2, result: 16
?>

    Part 3 – Comparison Operators

    • ==, !=, >, <, >=, <=
    • Example:
    <?php
$a = 10;
$b = 5;

var_dump($a > $b); // true
var_dump($a == $b); // false
var_dump($a != $b); // true
?>

    Part 4 – Logical Operators

    • && AND, || OR, ! NOT
    • Example:
    <?php
$x = true;
$y = false;

var_dump($x && $y); // false
var_dump($x || $y); // true
var_dump(!$x);      // false
?>

    Part 5 – Expressions & Real-life Example

    • Expressions என்பது Operators மற்றும் Variables பயன்படுத்தி ஒரு result generate செய்யும் statement.
    • Example:
    &lt;?php
$price = 100;
$tax = 0.18;
$total = $price + ($price * $tax);
echo "Total Price: $total"; // 118
?>
    • Real-life usage: Bill calculation, Age check, Login validation, etc.

  • var_dump() in PHP

    1️⃣ What is var_dump()?

    • var_dump() is a PHP built-in function.
    • It displays detailed information about a variable, including:
      • Data type (string, integer, array, boolean, etc.)
      • Value of the variable
      • Length (for strings or arrays)

    It’s mainly used for debugging during development.

    2️⃣ Syntax

    var_dump($variable);
    • $variable = any PHP variable you want to inspect.

    3️⃣ Examples

    Example 1 – Integer

    <?php
$age = 25;
var_dump($age);
?>

    Output:

    int(25)
    • int → data type
    • 25 → value

    Example 2 – String

    <?php
$name = "Saravana";
var_dump($name);
?>

    Output:

    string(8) "Saravana"
    • string → data type
    • (8) → number of characters
    • "Saravana" → value

    Example 3 – Boolean

    <?php
$isActive = true;
var_dump($isActive);
?>

    Output:

    bool(true)

    Example 4 – Array

    <?php
$colors = array("Red","Green","Blue");
var_dump($colors);
?>

    Output:

    array(3) {
  [0]=> string(3) "Red"
  [1]=> string(5) "Green"
  [2]=> string(4) "Blue"
}
    • array(3) → 3 elements
    • Shows index [0], [1], [2], type, and value of each element

    4️⃣ Why use var_dump()?

    1. Debugging variables: Know exactly what type and value a variable has.
    2. Inspect arrays or objects: See nested structures clearly.
    3. Avoid errors: Check before using variables in calculations or functions.

    Tip: You can also use print_r() to display arrays, but var_dump() gives more detailed info, including types.

  • PHP Operators & Expressions | PHP Tutorial in Tamil

    Part 1 – Arithmetic Operators

    • + Addition, – Subtraction, * Multiplication, / Division, % Modulus
    • Example:
    <?php
$a = 10;
$b = 3;

echo $a + $b; // 13
echo $a - $b; // 7
echo $a * $b; // 30
echo $a / $b; // 3.3333
echo $a % $b; // 1
?>

    Part 2 – Assignment Operators

    • *=, +=, -=, =, /=
    • Example:
    <?php
$x = 5;
$x += 3; // x = x + 3, result: 8
$x *= 2; // x = x * 2, result: 16
?>

    Part 3 – Comparison Operators

    • ==, !=, >, <, >=, <=
    • Example:
    <?php
$a = 10;
$b = 5;

var_dump($a > $b); // true
var_dump($a == $b); // false
var_dump($a != $b); // true
?>

    Part 4 – Logical Operators

    • && AND, || OR, ! NOT
    • Example:
    <?php
$x = true;
$y = false;

var_dump($x && $y); // false
var_dump($x || $y); // true
var_dump(!$x);      // false
?>

    Part 5 – Expressions & Real-life Example

    • Expressions என்பது Operators மற்றும் Variables பயன்படுத்தி ஒரு result generate செய்யும் statement.
    • Example:
    <?php
$price = 100;
$tax = 0.18;
$total = $price + ($price * $tax);
echo "Total Price: $total"; // 118
?>
    • Real-life usage: Bill calculation, Age check, Login validation, etc.