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Renamed files in 1_Basic folder
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‎1_Basics/1_basics.php‎

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<?php
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echo "Hello World!";
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echo "<br>";
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$a = 5;
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$b = 10;
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$c = $a + $b;
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$d = $a * $b;
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echo "Addition of a and b is: $c<br>";
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echo "Multiplication of a and b is: $d<br>";
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?>
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<!-- Variable naming conventions in PHP -->
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Basics</title>
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</head>
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<body>
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<?php
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echo "HELLO<br>";
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const WISHES = "Good Day!<br>"; // method 1
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echo WISHES;
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echo constant("WISHES"); // method 2
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define("WISHESS", "Good Day!"); // method 3
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echo WISHESS;
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echo "<br>";
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$a = "Welcome to LPU, Punjab";
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echo gettype($a); // string
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echo "<br>";
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echo strlen($a); // length of string $a = 22
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echo "<br>";
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echo str_word_count($a); // word count of string $a = 4
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echo "<br>";
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$t = date("H"); // current hour
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if ($t < "20") {
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echo "Have a good day!";
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} else {
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echo "Have a good night!";
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}
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?>
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</body>
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</html>

‎1_Basics/2_loops.php‎

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Loops</title>
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</head>
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<body>
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<?php
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$i = 1;
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while($i <= 10) {
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echo "The number is: $i<br>";
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$i++;
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}
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echo "<br>";
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$i = 1;
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do {
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echo "The number is: $i<br>";
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$i++;
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} while($i <= 10);
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echo "<br>";
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for($i = 1; $i <= 10; $i++) {
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echo "The number is: $i<br>";
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}
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echo "<br>";
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$colors = array("Red", "Green", "Blue", "Yellow");
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foreach($colors as $value) {
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echo "$value<br>";
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}
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echo "<br>";
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$age = array("Peter"=>"35", "Ben"=>"37", "Joe"=>"43");
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foreach($age as $x => $val) {
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echo "$x = $val<br>";
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}
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echo "<br>";
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$day = "Monday";
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switch ($day) {
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case "Monday":
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// continue;
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echo "Today is Monday";
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break;
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case "Tuesday":
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echo "Today is Tuesday";
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break;
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case "Wednesday":
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echo "Today is Wednesday";
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break;
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case "Thursday":
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echo "Today is Thursday";
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break;
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case "Friday":
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echo "Today is Friday";
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break;
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case "Saturday":
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echo "Today is Saturday";
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break;
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case "Sunday":
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echo "Today is Sunday";
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break;
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default:
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echo "Invalid day";
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}
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?>
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</body>
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</html>

‎1_Basics/3_arrays.php‎

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Document</title>
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</head>
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<body>
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<?php
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$colors = array("Red", "Green", "Blue", "Yellow");
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foreach ($colors as $value) {
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echo "$value<br>";
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}
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echo "<br>";
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$age = array("Peter" => "35", "Ben" => "37", "Joe" => "43");
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foreach ($age as $x => $val) {
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echo "$x = $val<br>";
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}
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echo "<br>";
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$day = "Monday";
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$month = "January";
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$year = 2020;
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$date = array($day, $month, $year);
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foreach ($date as $value) {
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echo "$value<br>";
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}
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echo "<br>";
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$date = array("day" => $day, "month" => $month, "year" => $year);
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foreach ($date as $key => $value) {
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echo "$key = $value<br>";
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}
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echo "<br>Using for loop";
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$cars = array(
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array("Volvo", 22, 18),
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array("BMW", 15, 13),
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array("Saab", 5, 2),
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array("Land Rover", 17, 15)
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);
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for ($row = 0; $row < 4; $row++) {
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echo "<p><b>Row number $row</b></p>";
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echo "<ul>";
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for ($col = 0; $col < 3; $col++) {
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echo "<li>" . $cars[$row][$col] . "</li>";
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}
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echo "</ul>";
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}
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echo "<br>Using For each loop";
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foreach ($cars as $row) {
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echo "<p><b>Row number</b></p>";
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echo "<ul>";
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foreach ($row as $col) {
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echo "<li>" . $col . "</li>";
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}
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echo "</ul>";
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}
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echo "<br>";
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$res = array(
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array("Manoj", 7.8, "Pass"),
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array("Aditya", 3.4, "Fail"),
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array("Rahul", 8.9, "Pass"),
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array("Rohit", 9.2, "Pass")
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);
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for($row = 0; $row < 4; $row++){
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echo "<p><b>Row number $row</b></p>";
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echo "<ul>";
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foreach($res[$row] as $ress){
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echo "<li>" . $ress . "</li>";
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}
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echo "</ul>";
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}
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echo "<br>";
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$emp = array((101)=>"Rahul", (102)=>"Rohit", (103)=>"Aditya", (104)=>"Manoj");
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echo "<pre>";
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print_r($emp); // print_r() is used to print the human-readable information about a variable
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echo "</pre>";
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echo "<br>2D traversal using foreach loop";
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$books = array("C++"=>array("name" => "Beginning with C++", "author" => "E.Balagurusamy", "price" => 450),
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"Java"=>array("name" => "Java Programming", "author" => "Herbert Schildt", "price" => 500),
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"Python"=>array("name" => "Python Programming", "author" => "Guido van Rossum", "price" => 600)
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);
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$keys = array_keys($books);
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for($i = 0;$i<count($books);$i++){
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echo "<h4>" . $keys[$i] . "</h4>";
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foreach($books[$keys[$i]] as $key => $value){
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echo $key . " : " . $value . "<br>";
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}
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// echo "<br>";
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}
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echo "<br>2D traversal using for loop(ERROR needs to be fixed)";
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for($i=0; $i <count($books); $i++){
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for($j=0; $j<count($books[$keys[$i]]); $j++){
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echo $books[$keys[$i]][$keys[$j]] . "<br>";
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}
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}
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?>
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</body>
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</html>

‎1_Basics/4_functions.php‎

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Document</title>
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</head>
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<body>
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<?php function helloWorld()
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{
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echo "Hello, world!";
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}
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helloWorld();
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echo "<br>";
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$users = ["Manoj", "Rahul", "Raj"];
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echo (is_array($users) ? "Yes, it is an array" : "No, it is not an array");
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echo "<br>";
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unset($users[2]);
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print_r($users);
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echo "<br>";
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// To remove last element
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array_pop($users);
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print_r($users);
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echo "<br>";
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$emp = ["name" => "abc", "age" => 25, "salary" => 25000];
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print_r(array_keys($emp));
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echo "<br>";
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// Using implode function to cpnvert array to string
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$colors = ["red", "green", "blue"];
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$colorsString = implode(", ", $colors);
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echo $colorsString;
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echo "<br>";
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// Using explode function to convert string to array
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$colorsString = "red, green, blue";
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$colorsArray = explode(", ", $colorsString);
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print_r($colorsArray);
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echo "<br>";
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// Removing duplicate values from an array
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$numbers = [1, 2, 3, 4, 4, 5, 6, 6];
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$uniqueNumbers = array_unique($numbers);
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print_r($uniqueNumbers);
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echo "<br>";
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// Merging two arrays
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$array1 = [1, 2, 3];
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$array2 = [4, 5, 6];
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$mergedArray = array_merge($array1, $array2);
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print_r($mergedArray);
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echo "<br>";
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// Combining two arrays into an associative array
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$keys = ["name", "age", "salary"];
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$values = ["John Doe", 30, 50000];
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$combinedArray = array_combine($keys, $values);
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print_r($combinedArray);
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echo "<br>";
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// Splitting an array into chunks
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$numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
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$chunks = array_chunk($numbers, 3); //preserve key
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print_r($chunks);
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echo "<br>";
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$courses = array("PHP", "Laravel", "Node.js", "HTML", "CSS", "ASP.NET");
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$slicedArray = array_slice($courses, 2, 3, true);
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print_r($slicedArray);
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echo "<br>";
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// Finding the difference between two arrays
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$array1 = ["apple", "banana", "orange"];
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$array2 = ["banana", "orange", "grapefruit"];
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$difference = array_diff($array1, $array2); //returns entry which are present in array 1 but not array 2
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print_r($difference);
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echo "<br>";
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?>
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</body>
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</html>

‎1_Basics/5_data_type.php‎

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<?php
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$x = "Hello world!";
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$y = 'Hello world!';
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$x = 5985;
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$z = 10.365;
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$a = true;
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$b=null;
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$cars = array("Volvo","BMW","Toyota");
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echo($a);
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echo "<br>";
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echo $x;
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echo "<br>";
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echo($y);
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echo "<br>";
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echo($z);
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echo "<br>";
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echo ($b);
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echo "<br>";
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echo gettype($cars);
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echo "<br>";
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var_dump($z == $y);
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?>

‎1_Basics/6_array.php‎

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<?php
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$a=array("rahul","mohan");
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echo gettype($a);
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echo "<br>";
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$cars = array("Volvo","BMW","Toyota");
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echo gettype($cars);
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echo "<br>";
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$b = ["INT219" => "Front End Web", "INT220" => "PHP", "INT221" => "Laravel"];
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$c = ["INT222" => "Node js", "CSE316" => "Operating System"];
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$d = ($b + $c); // Union of $a and $b
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print_r($d);
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echo "<br>";
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var_dump($d);
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?>

‎1_Basics/7_var1.php‎

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<?php
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$str = "raining";
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echo "It is $str!";
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echo "\n";
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echo 'It is $str!'; // this shows a different result; single inverted code don't show value of variable
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echo "\n";
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echo "It is ".$str."!";

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