$_GET Examples
1. Basic URL Parameter
<?php
$name = $_GET['name'];
echo "Welcome, " . $name;
?>
2. Check If Parameter Exists
<?php
if (isset($_GET['id'])) {
$id = $_GET['id'];
echo "Product ID: $id";
} else {
echo "No ID provided";
}
?>
3. Multiple Parameters
<?php
$category = $_GET['category'];
$page = $_GET['page'];
$sort = $_GET['sort'];
echo "Showing $category sorted by $sort (Page $page)";
?>
4. Default Value If Missing
<?php
$page = $_GET['page'] ?? 1;
$limit = $_GET['limit'] ?? 10;
echo "Page: $page, Items per page: $limit";
?>
5. Sanitize Input (Security)
<?php
$search = $_GET['q'] ?? '';
$safe = htmlspecialchars($search, ENT_QUOTES, 'UTF-8');
echo "You searched for: $safe";
?>
6. Build Dynamic Links
<?php
$current = $_GET['page'] ?? 1;
$next = $current + 1;
$prev = max(1, $current - 1);
echo "<a href='?page=$prev'>Prev</a>";
echo " | Page $current | ";
echo "<a href='?page=$next'>Next</a>";
?>
$_POST Examples
1. Basic Form Data
<?php
$username = $_POST['username'];
$password = $_POST['password'];
echo "Welcome, $username";
?>
2. Check Request Method
<?php
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
$name = $_POST['name'];
echo "Form submitted by: $name";
} else {
echo "Please submit the form";
}
?>
3. Complete Contact Form
<?php
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
$name = htmlspecialchars($_POST['name']);
$email = filter_var($_POST['email'], FILTER_SANITIZE_EMAIL);
$message = htmlspecialchars($_POST['message']);
echo "Name: $name<br>";
echo "Email: $email<br>";
echo "Message: $message";
}
?>
4. Validate Email
<?php
$email = $_POST['email'];
if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
echo "Valid email: $email";
} else {
echo "Invalid email address";
}
?>
5. Password Hashing
<?php
$password = $_POST['password'];
$hashed = password_hash($password, PASSWORD_DEFAULT);
echo "Hashed: $hashed";
if (password_verify($password, $hashed)) {
echo "Password correct!";
}
?>
6. Multiple Checkboxes
<?php
$skills = $_POST['skills'] ?? [];
foreach ($skills as $skill) {
echo "Selected: $skill<br>";
}
?>
Arithmetic Examples
1. All Basic Operators
<?php
$a = 10;
$b = 3;
echo $a + $b;
echo $a - $b;
echo $a * $b;
echo $a / $b;
echo $a % $b;
echo $a ** $b;
?>
2. Calculate Total Price
<?php
$price = 99.99;
$quantity = 3;
$tax = 0.15;
$subtotal = $price * $quantity;
$total = $subtotal + ($subtotal * $tax);
echo "Total: $" . number_format($total, 2);
?>
3. Check Even/Odd (Modulus)
<?php
$num = 7;
if ($num % 2 == 0) {
echo "$num is Even";
} else {
echo "$num is Odd";
}
?>
4. Increment & Decrement
<?php
$x = 5;
echo ++$x;
echo $x++;
echo --$x;
echo $x--;
?>
5. Calculate Average
<?php
$scores = [85, 90, 78, 92, 88];
$sum = array_sum($scores);
$count = count($scores);
$average = $sum / $count;
echo "Average: $average";
?>
6. Compound Assignment
<?php
$x = 10;
$x += 5;
$x -= 3;
$x *= 2;
$x /= 4;
echo $x;
?>
Comparison Examplesأمثلة المقارنة
1. Equal (==)
<?php
if (5 == "5") {
echo "True: Values are equal.";
}
?>
2. Identical (===)
<?php
if (5 === "5") {
echo "False";
}
?>
3. Greater/Less Than
<?php
$age = 20;
if ($age >= 18) {
echo "Adult";
}
?>
4. Not Equal (!=)
<?php
$x = 100;
if ($x != 50) {
echo "Not fifty";
}
?>
5. Spaceship (<=>)
<?php
$a = 10;
$b = 10;
echo $a <=> $b;
?>
6. Null Coalescing (??)
<?php
$user = $_GET['user'] ?? 'Guest';
echo "Hello $user";
?>
If/Else Examplesأمثلة If/Else
1. Simple If
<?php
$score = 90;
if ($score > 50) {
echo "Pass";
}
?>
2. If...Else
<?php
$light = "Red";
if ($light == "Green") {
echo "Go";
} else {
echo "Stop";
}
?>
3. Elseif Chain
<?php
$t = 15;
if ($t < 10) {
echo "Morning";
} elseif ($t < 20) {
echo "Day";
} else {
echo "Night";
}
?>
4. Ternary Operator
<?php
$age = 20;
$status = ($age >= 18) ? "Adult" : "Minor";
echo $status;
?>
5. Nested If
<?php
$a = 10;
$b = 20;
if ($a > 5) {
if ($b > 15) {
echo "Both match";
}
}
?>
6. Logical Operators
<?php
$x = 10;
$y = 20;
if ($x == 10 && $y == 20) {
echo "True";
}
?>
Switch Examplesأمثلة Switch
1. Basic Switch
<?php
$color = "Red";
switch ($color) {
case "Red":
echo "Is Red";
break;
case "Blue":
echo "Is Blue";
break;
}
?>
2. Default Case
<?php
switch ($day) {
case "Sat":
echo "Weekend";
break;
default:
echo "Work day";
}
?>
3. Multiple Cases
<?php
switch ($fruit) {
case "Apple":
case "Pear":
echo "Pome Fruit";
break;
}
?>
4. Switch True
<?php
$age = 18;
switch (true) {
case ($age < 10):
echo "Child";
break;
case ($age >= 10):
echo "Teen/Adult";
}
?>
5. Match (PHP 8)
<?php
$status = 200;
$msg = match($status) {
200 => "OK",
400 => "Error",
default => "Unknown",
};
echo $msg;
?>
6. Alt Syntax
<?php
$i = 1;
switch ($i):
case 1:
echo "One";
break;
endswitch;
?>
For Loop Examplesأمثلة حلقة For
1. Count to 5
<?php
for ($i=1; $i<=5; $i++) {
echo "Number: $i <br>";
}
?>
2. Count Down
<?php
for ($i=10; $i>0; $i--) {
echo $i . "...";
}
?>
3. Array Loop
<?php
$colors = ["Red", "Blue"];
for ($i=0; $i < count($colors); $i++) {
echo $colors[$i];
}
?>
4. Break Loop
<?php
for ($i=0; $i<10; $i++) {
if ($i == 5) break;
echo $i;
}
?>
5. Continue Loop
<?php
for ($i=0; $i<5; $i++) {
if ($i == 2) continue;
echo $i;
}
?>
6. Nested Loop (Grid)
<?php
for ($x=1; $x<=2; $x++) {
for ($y=1; $y<=2; $y++) {
echo "$x,$y ";
}
}
?>
While Loop Examplesأمثلة حلقة While
1. Basic While
<?php
$x = 1;
while ($x <= 5) {
echo $x++;
}
?>
2. Do...While
<?php
$x = 10;
do {
echo "Runs once";
} while ($x < 5);
?>
3. Break Condition
<?php
$i = 0;
while (true) {
$i++;
if ($i > 10) break;
}
?>
4. While Continue
<?php
$i = 0;
while ($i < 5) {
$i++;
if ($i == 3) continue;
echo $i;
}
?>
5. Random Until Match
<?php
$n = 0;
while ($n != 5) {
$n = rand(1, 10);
echo $n . " ";
}
?>
6. Nested While
<?php
$i = 1;
while ($i <= 2) {
$j = 1;
while ($j <= 2) {
echo "$i-$j ";
$j++;
}
$i++;
}
?>
Echo & Print Examplesأمثلة الطباعة
1. Echo Strings
<?php
echo "Hello World!";
?>
2. Echo Variables
<?php
$name = "PHP";
echo "Learn " . $name;
?>
3. Print Statement
<?php
print "Hello";
?>
4. Concatenation
<?php
$first = "PHP";
$last = "Mastery";
echo $first . " " . $last;
?>
5. Echo HTML
<?php
echo "<h1>Title</h1>";
echo "<p>Paragraph</p>";
?>
6. Debug Dump
<?php
$arr = [1, 2, 3];
var_dump($arr);
?>
