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Topic: PHP Basics – Part 3 of 10: Control Structures (if, else, elseif, switch, loops) --- 1. Conditional Statements in PHP PHP allows decision-making in your code through control structures like if, else, elseif, and switch. --- 2. `if`, `else`, and `elseif` Statements

<?php
$score = 85;

if ($score >= 90) {
    echo "Grade: A";
} elseif ($score >= 80) {
    echo "Grade: B";
} elseif ($score >= 70) {
    echo "Grade: C";
} else {
    echo "Grade: F";
}
?>

• The condition inside if() must return true or false. • You can chain multiple conditions using elseif. --- 3. `switch` Statement • Good for checking a variable against multiple possible values.

<?php
$day = "Tuesday";

switch ($day) {
    case "Monday":
        echo "Start of the week!";
        break;
    case "Friday":
        echo "Weekend is near!";
        break;
    case "Sunday":
        echo "Rest day!";
        break;
    default:
        echo "Just another day.";
}
?>

• Each case must end with a break to avoid fall-through. --- 4. Loops in PHP Loops allow repeating code multiple times. --- 5. `while` Loop

<?php
$i = 0;
while ($i < 5) {
    echo "Number: $i<br>";
    $i++;
}
?>

• Repeats while the condition is true. --- 6. `do...while` Loop

<?php
$i = 0;
do {
    echo "Count: $i<br>";
    $i++;
} while ($i < 3);
?>

• Executes at least once even if the condition is false initially. --- 7. `for` Loop

<?php
for ($i = 1; $i <= 5; $i++) {
    echo "Line $i<br>";
}
?>

• Most commonly used loop with initializer, condition, and increment. --- 8. `foreach` Loop • Used to iterate over arrays.

<?php
$colors = array("red", "green", "blue");
foreach ($colors as $color) {
    echo "Color: $color<br>";
}
?>

• Also works with key-value pairs:

<?php
$person = array("name" => "Ali", "age" => 28);
foreach ($person as $key => $value) {
    echo "$key: $value<br>";
}
?>

--- 9. Control Keywords • break – Exit a loop or switch. • continue – Skip current iteration and go to the next.

for ($i = 1; $i <= 5; $i++) {
    if ($i == 3) continue;
    echo "$i<br>";
}

--- 10. Summary • Conditional logic (if, else, switch) helps make decisions. • Loops (for, while, foreach) help automate repetitive tasks. • Control flow is critical for building dynamic applications. --- Exercise • Write a PHP script that prints numbers 1 to 20, but skips multiples of 3 using continue, and stops completely if the number is 17 using break. --- #PHP #ControlStructures #Loops #PHPTutorial #BackendDevelopment https://t.me/Ebooks2023

Topic: PHP Basics – Part 2 of 10: Data Types and Operators --- 1. PHP Data Types PHP supports multiple data types. The most common include: • String – A sequence of characters.

$name = "Ali";

• Integer – Whole numbers.

$age = 30;

• Float (Double) – Decimal numbers.

$price = 19.99;

• Boolean – true or false.

$is_active = true;

• Array – Collection of values.

$colors = array("red", "green", "blue");

• Object, NULL, Resource – Used in advanced scenarios. --- 2. Type Checking Functions

var_dump($variable); // Displays type and value
is_string($name);    // Returns true if $name is a string
is_array($colors);   // Returns true if $colors is an array

--- 3. PHP Operators • Arithmetic Operators

$a = 10;
$b = 3;
echo $a + $b;  // Addition
echo $a - $b;  // Subtraction
echo $a * $b;  // Multiplication
echo $a / $b;  // Division
echo $a % $b;  // Modulus

• Assignment Operators

$x = 5;
$x += 3; // same as $x = $x + 3

• Comparison Operators

$a == $b  // Equal
$a === $b // Identical (value + type)
$a != $b  // Not equal
$a > $b   // Greater than

• Logical Operators

($a > 0 && $b > 0) // AND
($a > 0 || $b > 0) // OR
!$a               // NOT

--- 4. String Concatenation • Use the dot (.) operator to join strings.

$first = "Hello";
$second = "World";
echo $first . " " . $second;

--- 5. Summary • PHP supports multiple data types and a wide variety of operators. • You can check and manipulate data types easily using built-in functions. --- Exercise • Create two variables: one string and one number. Perform arithmetic and string concatenation, and print the results. --- #PHP #DataTypes #Operators #Backend #PHPTutorial https://t.me/Ebooks2023

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Topic: PHP Basics – Part 1 of 10: Introduction and Syntax 1. What is PHP? • PHP (Hypertext Preprocessor) is a widely-used, open-source server-side scripting language designed for web development. • Embedded in HTML and used to create dynamic web pages, manage databases, handle forms, sessions, and more. 2. Why Use PHP? • Easy to learn and integrates seamlessly with HTML. • Works well with MySQL and popular servers like Apache or Nginx. • Supported by major CMS platforms like WordPress, Drupal, and Joomla. 3. PHP Syntax Overview • PHP code is written inside <?php ... ?> tags. <?php echo "Hello, World!"; ?> • Every PHP statement ends with a semicolon (;). 4. Basic Output with echo and print <?php echo "This is output using echo"; print "This is output using print"; ?> • echo is slightly faster; print returns a value. 5. PHP Variables • Variables start with a dollar sign ($) and are case-sensitive. <?php $name = "Ali"; $age = 25; echo "My name is $name and I am $age years old."; ?> 6. PHP Comments // Single-line comment # Also single-line comment /* Multi-line comment */ 7. Summary • PHP is a server-side scripting language used to build dynamic web applications. • Basic syntax includes echo, variables with $, and proper use of <?php ... ?> tags. Exercise • Write a simple PHP script that defines two variables ($name and $age) and prints a sentence using them. #PHP #WebDevelopment #PHPTutorial #ServerSide #Backend https://t.me/DataScience4

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