Solution

01.print.php

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+<?php
+echo "hola?";
+print"hola2?";
+$array = array('apple', 'banana', 'orange');
+
+print_r($array);
+
+
+
+
+?>

02.iterators.php

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+<?php
+
+for ($i = 1; $i <= 10; $i++) {
+    echo $i . "<br>";
+}
+
+
+foreach ($fruits as $fruit) {
+    echo $fruit . "<br>";
+}
+
+$i = 1;
+while ($i <= 10) {
+    echo $i . "<br>";
+    $i++;
+}
+
+
+$i2 = 1;
+do {
+    echo $i2 . "<br>";
+    $i2++;
+} while ($i2 <= 10);
+
+
+?>

03.operators.php

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+<?php
+var_dump(1 == 2); 
+$a = 5;
+$b = 3;
+
+echo $a + $b . "<br>"; // Outputs 8
+echo $a - $b . "<br>"; // Outputs 2
+echo $a * $b . "<br>"; // Outputs 15
+echo $a / $b . "<br>"; // Outputs 1.6666666666667
+echo $a % $b . "<br>"; // Outputs 2
+
+
+echo $a == $b . "<br>"; // Outputs false
+echo $a != $b . "<br>"; // Outputs true
+echo $a < $b . "<br>";  // Outputs false
+echo $a > $b . "<br>";
+
+
+$c = true;
+$d = false;
+
+echo ($c && $d) . "<br>"; // Outputs false
+echo ($c || $d) . "<br>"; // Outputs true
+echo !$c . "<br>";       // Outputs false
+echo ($c xor $d) . "<br>"; // Outputs true
+?>

04.dates.php

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+<?php
+$date1 = new DateTime();
+echo $date1->format("Y-m-d");
+
+$date2 = new DateTime("2022-12-20");
+echo $date2->format("Y-m-d"); // Outputs "2022-12-20"
+
+$timestamp = strtotime("2022-12-20");
+$date3 = new DateTime("@$timestamp");
+echo $date3->format("Y-m-d"); // Outputs "2022-12-20"
+
+echo date("d"); // Outputs the current day of the month as a 2-digit number (e.g. "01", "02", ..., "31")
+
+echo $date3->format("d"); // Outputs the current day of the month as a 2-digit number (e.g. "01", "02", ..., "31")
+
+echo date("m"); // Outputs the current month as a 2-digit number (e.g. "01", "02", ..., "12")
+
+$date5 = new DateTime();
+echo $date5->format("m"); // Outputs the current month as a 2-digit number (e.g. "01", "02", ..., "12")
+
+echo date("i"); // Outputs the current minute as a 2-digit number with leading zeros (e.g. "00", "01", ..., "59")
+
+$date6 = new DateTime();
+echo $date6->format("i"); // Outputs the current minute as a 2-digit number with leading zeros (e.g. "00", "01", ..., "59")
+
+
+
+?>

05.conditionals.php

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+<?php
+
+$day = date("l"); // Get the current day of the week as a full textual representation (e.g. "Monday", "Tuesday", ..., "Sunday")
+
+if ($day == "Monday") {
+    echo "We are on Monday";
+}
+
+$date1 = new DateTime();
+$day = $date1->format("l"); // Get the current day of the week as a full textual representation (e.g. "Monday", "Tuesday", ..., "Sunday")
+
+if ($day == "Monday") {
+    echo "We are on Monday";
+}
+
+
+$month = date("F"); // Get the current month as a full textual representation (e.g. "January", "February", ..., "December")
+
+if ($month == "October") {
+    echo "We are in October";
+} else {
+    echo "We are in $month";
+}
+
+$date2 = new DateTime();
+$month = $date2->format("F"); // Get the current month as a full textual representation (e.g. "January", "February", ..., "December")
+
+if ($month == "October") {
+    echo "We are in October";
+} else {
+    echo "We are in $month";
+}
+
+$minute = date("i"); // Get the current minute as a 2-digit number (e.g. "00", "01", ..., "59")
+
+if ($minute < 10) {
+    echo "The current minute is less than 10";
+} elseif ($minute > 15) {
+    echo "The current minute is more than 15";
+} else {
+    echo "Does not meet any conditions";
+}
+
+$date3 = new DateTime();
+$minute = $date3->format("i"); // Get the current minute as a 2-digit number (e.g. "00", "01", ..., "59")
+
+if ($minute < 10) {
+    echo "The current minute is less than 10";
+} elseif ($minute > 15) {
+    echo "The current minute is more than 15";
+} else {
+    echo "Does not meet any conditions";
+}
+
+
+$day = date("l"); // Get the current day of the week as a full textual representation (e.g. "Monday", "Tuesday", ..., "Sunday")
+
+switch ($day) {
+    case "Monday":
+        echo "It's the start of a new week!";
+        break;
+    case "Wednesday":
+        echo "Hump day!";
+        break;
+    case "Friday":
+        echo "TGIF!";
+        break;
+    case "Saturday":
+        echo "Time to relax and enjoy the weekend!";
+        break;
+    case "Sunday":
+        echo "End of the weekend, time to get ready for another week.";
+        break;
+    default:
+        echo "Just another day...";
+        break;
+}
+
+
+
+
+
+?>

06.types.php

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+<?php
+// Define a boolean variable
+$bool = true;
+
+// Define an integer variable
+$int = 123;
+
+// Define a float variable
+$float = 3.14;
+
+// Define a string variable
+$string = "Hello, World!";
+
+// Define an array variable
+$array = array(1, 2, 3, 4, 5);
+
+// Define an object variable
+class MyClass { }
+$object = new MyClass();
+
+// Define a NULL variable
+$null = null;
+
+
+
+
+
+?>

07.maths.php

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+<?php
+// Define a variable with the result of the abs function (returns the absolute value)
+$absValue = abs(-123); // $absValue will be 123
+
+// Define a variable with the result of the ceil function (returns the next highest integer)
+$roundedUp = ceil(3.14); // $roundedUp will be 4
+
+// Define a variable with the result of the max function (returns the highest value of a series of values)
+$maxValue = max(1, 2, 3, 4, 5); // $maxValue will be 5
+
+// Define a variable with the result of the min function (returns the lowest value of a series of values)
+$minValue = min(1, 2, 3, 4, 5); // $minValue will be 1
+
+// Define a variable with the result of the rand function (returns a random number)
+$randomNumber = rand(1, 100); // $randomNumber will be a random number between 1 and 100 (inclusive)
+
+
+
+
+?>

08.strings.php

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+<?php
+// Print a text string
+echo "Hello, World!";
+
+// Print a text string that interprets variables
+$name = "John";
+echo "Hello, $name!";
+
+// Concatenate a previously declared variable in a text string
+$name = "John";
+echo "Hello, " . $name . "!";
+
+// Execute the function that allows you to replace text in a string (case sensitive)
+$text = "Hello, World!";
+$newText = str_replace("World", "PHP", $text);
+echo $newText; // Outputs "Hello, PHP!"
+
+// Execute the function that allows you to replace text in a string (without taking into account upper / lower case)
+$text = "Hello, World!";
+$newText = str_ireplace("world", "PHP", $text);
+echo $newText; // Outputs "Hello, PHP!"
+
+// Execute the function that allows you to write a text N times
+$text = "Hello, World! ";
+echo str_repeat($text, 3); // Outputs "Hello, World! Hello, World! Hello, World! "
+
+// Execute the function that allows to obtain the length of a text string
+$text = "Hello, World!";
+echo strlen($text); // Outputs 13
+
+// Executes the function that allows to obtain the position of the first occurrence of a text within a text string
+$text = "Hello, World!";
+echo strpos($text, "W"); // Outputs 6
+
+// Execute the function that allows a text string to be capitalized
+$text = "hello, world!";
+echo ucwords($text); // Outputs "Hello, World!"
+
+// Execute the function that allows you to transform a text string to lowercase
+$text = "HELLO, WORLD!";
+echo strtolower($text); // Outputs "hello, world!"
+
+// Execute the function that allows to obtain a text substring from a given position
+$text = "Hello, World!";
+echo substr($text, 6);
+
+
+?>

09.arrays.php

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+<?php
+// Define a simple array composed of text strings
+$array1 = array("apple", "banana", "orange");
+
+// Define a simple array consisting of whole numbers and decimal numbers
+$array2 = array(1, 2.5, 3, 4.5);
+
+// Define a multidimensional array
+$array3 = array(
+    array(1, 2, 3),
+    array(4, 5, 6),
+    array(7, 8, 9)
+);
+
+// Execute the function that allows to obtain the length of an array
+echo count($array1); // Outputs 3
+
+// Execute the function that allows to obtain the combination of two arrays
+$combinedArray = array_merge($array1, $array2);
+print_r($combinedArray);
+// Outputs Array ( [0] => apple [1] => banana [2] => orange [3] => 1 [4] => 2.5 [5] => 3 [6] => 4.5 )
+
+// Execute the function that once is given an array return the last element of it
+echo end($array1); // Outputs "orange"
+
+// Execute the function that once is given an array add a new element to the array in question
+array_push($array1, "mango");
+print_r($array1); // Outputs Array ( [0] => apple [1] => banana [2] => orange [3] => mango )
+
+
+
+?>

10.functions.php

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+<?php
+// Create a function that given two numbers returns the sum of both
+function sum($x, $y) {
+    return $x + $y;
+}
+
+// Create a function that given two numbers returns the multiplication of both
+function multiply($x, $y) {
+    return $x * $y;
+}
+
+// Create a function that given two numbers returns the division of both
+function divide($x, $y) {
+    return $x / $y;
+}
+
+// Create a function that, given two numbers and an operation (add, multiply or divide), returns the result of that operation
+function calculate($x, $y, $operation) {
+    switch ($operation) {
+        case "add":
+            return sum($x, $y);
+        case "multiply":
+            return multiply($x, $y);
+        case "divide":
+            return divide($x, $y);
+        default:
+            return "Invalid operation";
+    }
+}
+
+// Test the calculate function
+echo calculate(1, 2, "add"); // Outputs 3
+echo calculate(3, 4, "multiply"); // Outputs 12
+echo calculate(6, 2, "divide"); // Outputs 3
+echo calculate(5, 6, "subtract"); // Outputs "Invalid operation"
+
+
+?>

11.phpinfo.php

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+<?php
+
+
+
+?>