PHP Assignment operators

Mastering PHP Assignment Operators: A Comprehensive Guide

Introduction:
Learn the ins and outs of PHP assignment operators with our comprehensive guide. Whether you’re a beginner or an experienced developer, this lesson covers the basics, advanced techniques, and practical examples to enhance your PHP programming skills.

PHP Assignment operators

In PHP, assignment operators are used to assign values to variables. They are shorthand notations that combine the assignment operation with another operation. Here are some commonly used assignment operators in PHP:

PHP Assignment (=):

The basic assignment operator is the equal sign (=). It assigns the value on the right to the variable on the left.

$a = 10; // $a is assigned the value 10

PHP Addition Assignment (+=):

Adds the right operand to the left operand and assigns the result to the left operand.

$a += 5; // Equivalent to: $a = $a + 5;

PHP Subtraction Assignment (-=):

Subtracts the right operand from the left operand and assigns the result to the left operand.

$a -= 3; // Equivalent to: $a = $a – 3;

PHP Multiplication Assignment (*=):

Multiplies the left operand by the right operand and assigns the result to the left operand.

$a *= 2; // Equivalent to: $a = $a * 2;

PHP Division Assignment (/=):

Divides the left operand by the right operand and assigns the result to the left operand.

$a /= 4; // Equivalent to: $a = $a / 4;

PHP Modulus Assignment (%=):

Calculates the modulus of the left operand divided by the right operand and assigns the result to the left operand.

$a %= 3; // Equivalent to: $a = $a % 3;

PHP Concatenation Assignment (.=):

Concatenates the right operand to the left operand and assigns the result to the left operand.

$str = “Hello “;
$str .= “World!”; // Equivalent to: $str = $str . “World!”;

These assignment operators help to perform operations and update the value of a variable in a concise and readable manner.

complete example in html with explanation

Let’s create a simple HTML page with PHP code that demonstrates the use of various assignment operators.
I’ll include comments to explain each part of the code:

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>PHP Assignment Operators Example</title>
</head>
<body>

<?php
// PHP code starts here

// Basic assignment
$a = 10;
echo "<p>Value of \$a after basic assignment: $a</p>";

// Addition assignment
$a += 5;
echo "<p>Value of \$a after addition assignment: $a</p>";

// Subtraction assignment
$a -= 3;
echo "<p>Value of \$a after subtraction assignment: $a</p>";

// Multiplication assignment
$a *= 2;
echo "<p>Value of \$a after multiplication assignment: $a</p>";

// Division assignment
$a /= 4;
echo "<p>Value of \$a after division assignment: $a</p>";

// Modulus assignment
$a %= 3;
echo "<p>Value of \$a after modulus assignment: $a</p>";

// Concatenation assignment
$str = "Hello ";
$str .= "World!";
echo "<p>Concatenated string: $str</p>";

// PHP code ends here
?>

</body>
</html>

Explanation:

Basic Assignment: The variable $a is assigned the value 10.
Addition Assignment: 5 is added to the current value of $a.
Subtraction Assignment: 3 is subtracted from the current value of $a.
Multiplication Assignment: The current value of $a is multiplied by 2.
Division Assignment: The current value of $a is divided by 4.
Modulus Assignment: The modulus of the current value of $a divided by 3 is assigned to $a.
Concatenation Assignment: The string “World!” is concatenated to the existing string “Hello “.

The HTML page displays the results of each operation, providing a visual representation of the effects of different assignment operators in PHP.

Am application about this lesson with explanation

Let’s create a simple PHP web application that provides a quiz about PHP assignment operators. This application will consist of two pages: one for the quiz questions and another for displaying the quiz results.

index.php (Quiz Questions Page):

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>PHP Assignment Operators Quiz</title>
</head>
<body>

<h1>PHP Assignment Operators Quiz</h1>
<form action="results.php" method="post">

<?php
$questions = array(
"What is the purpose of the basic assignment operator in PHP?",
"Which operator is used for addition assignment in PHP?",
"What does the following code do? \$a -= 3;",
"What does the modulus assignment operator (\%=) do in PHP?",
"How is concatenation assignment represented in PHP?",
"What will be the value of \$a after the code \$a *= 2; if \$a was initially 5?",
"Which operator is used for division assignment in PHP?",
"What is the output of the code \$str = 'Hello '; \$str .= 'World!'; echo \$str;?",
"What is the primary purpose of concatenation assignment?",
"Which assignment operator is used to subtract a value in PHP?",
"What will be the value of \$a after the code \$a /= 4; if \$a was initially 16?",
"What does the code \$a %= 3; do?",
"How is the value of \$a updated in the code \$a += 5; if \$a was initially 8?",
"Which assignment operator is used for basic assignment in PHP?",
"What is the purpose of the concatenation operator (.) in PHP?"
);

$choices = array(
array("A) Addition", "B) Subtraction", "C) Assignment", "D) Concatenation"),
array("A) +=", "B) -=", "C) *=", "D) /="),
array("A) Adds 3 to \$a", "B) Subtracts 3 from \$a", "C) Multiplies \$a by 3", "D) Divides \$a by 3"),
array("A) Adds", "B) Subtracts", "C) Finds the remainder", "D) Multiplies"),
array("A) .+", "B) =.", "C) .=", "D) :+"),
array("A) 10", "B) 7", "C) 15", "D) 2.5"),
array("A) %", "B) /", "C) /=", "D) *="),
array("A) Hello", "B) World!", "C) Hello World!", "D) Hello + World!"),
array("A) Addition", "B) Subtraction", "C) String concatenation", "D) Division"),
array("A) -", "B) -=", "C) /=", "D) *="),
array("A) 4", "B) 2", "C) 8", "D) 16"),
array("A) Multiplies \$a by 3", "B) Divides \$a by 3", "C) Adds 3 to \$a", "D) Finds the remainder of \$a divided by 3"),
array("A) \$a remains 8", "B) \$a becomes 5", "C) \$a becomes 13", "D) \$a becomes 3"),
array("A) =:", "B) ==", "C) =", "D) :="),
array("A) Addition", "B) Subtraction", "C) String concatenation", "D) Multiplication")
);

for ($i = 0; $i < count($questions); $i++) {
echo "<p><strong>{$questions[$i]}</strong></p>";
foreach ($choices[$i] as $choice) {
echo "<label><input type='radio' name='q{$i}' value='{$choice}'> {$choice}</label><br>";
}
echo "<br>";
}

?>

<button type="submit">Submit Quiz</button>

</form>
</body>
</html>

results.php (Quiz Results Page):

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>PHP Assignment Operators Quiz Results</title>
</head>
<body>

<h1>PHP Assignment Operators Quiz Results</h1>

<?php

$correctAnswers = array(
"C) Assignment",
"A) +=",
"B) Subtracts 3 from \$a",
"C) Finds the remainder",
"C) .=",
"A) 10",
"C) /=",
"C) Hello World!",
"C) String concatenation",
"B) -=",
"B) 2",
"D) Finds the remainder of \$a divided by 3",
"C) \$a becomes 13",
"C) =",
"C) String concatenation"
);

$score = 0;

foreach ($_POST as $key => $value) {
$Answer = htmlspecialchars($value);
$questionNumber = filter_var($key, FILTER_SANITIZE_NUMBER_INT);

echo "<p><strong>Question {$questionNumber}:</strong><br>";
echo "Your Answer: {$Answer}<br>";
echo "Correct Answer: {$correctAnswers[$questionNumber]}</p>";

if ($Answer === $correctAnswers[$questionNumber]) {
$score++;
}
}

echo "<h2>Your Score: {$score} / " . count($correctAnswers) . "</h2>";

?>

</body>
</html>

Explanation:

index.php contains the quiz questions and choices in a form. Each question has radio buttons for the to select their answer.
results.php processes the submitted form, compares the ‘s answers with the correct answers, and displays the results along with the ‘s score.
To use this application, save the two code snippets into separate files (index.php and results.php) and place them in the same directory on a PHP-enabled web server.
Access index.php through a web browser to take the quiz. After submitting the form, the results will be displayed on the results.php page.

A quiz about this lesson:15 questions

Here’s a quiz about PHP assignment operators.
Each question has multiple-choice answers. Choose the correct option for each question.

1. What is the purpose of the basic assignment operator in PHP?

A) Addition
B) Subtraction
C) Assignment
D) Concatenation

2. Which operator is used for addition assignment in PHP?

A) +=
B) -=
C) *=
D) /=

3. What does the following code do? $a -= 3;

A) Adds 3 to $a
B) Subtracts 3 from $a
C) Multiplies $a by 3
D) Divides $a by 3

4. What does the modulus assignment operator (%=) do in PHP?

A) Adds
B) Subtracts
C) Finds the remainder
D) Multiplies

5. How is concatenation assignment represented in PHP?

A) .+
B) =.
C) .=
D) :+

6. What will be the value of $a after the code $a *= 2; if $a was initially 5?

A) 10
B) 7
C) 15
D) 2.5

7. Which operator is used for division assignment in PHP?

A) %
B) /
C) /=
D) *=

8. What is the output of the code $str = “Hello “; $str .= “World!”; echo $str;?

A) Hello
B) World!
C) Hello World!
D) Hello + World!

9. What is the primary purpose of concatenation assignment?

A) Addition
B) Subtraction
C) String concatenation
D) Division

10. Which assignment operator is used to subtract a value in PHP?

– A) –
– B) -=
– C) /=
– D) *=

11. What will be the value of $a after the code $a /= 4; if $a was initially 16?

– A) 4
– B) 2
– C) 8
– D) 16

12. What does the code $a %= 3; do?

– A) Multiplies $a by 3
– B) Divides $a by 3
– C) Adds 3 to $a
– D) Finds the remainder of $a divided by 3

13. How is the value of $a updated in the code $a += 5; if $a was initially 8?

– A) $a remains 8
– B) $a becomes 5
– C) $a becomes 13
– D) $a becomes 3

14. Which assignment operator is used for basic assignment in PHP?

– A) :=
– B) ==
– C) =
– D) =

15. What is the purpose of the concatenation operator (.) in PHP?

– A) Addition
– B) Subtraction
– C) String concatenation
– D) Multiplication

Answers:

1-C) Assignment
2-A) +=
3-B) Subtracts 3 from $a
4-C) Finds the remainder
5-C) .=
6-A) 10
7-C) /=
8-C) Hello World!
9-C) String concatenation
10-B) -=
11-B) 2
12-D) Finds the remainder of $a divided by 3
13-C) $a becomes 13
14-C) =
15-C) String concatenation

PHP Tutorial

Curriculum

PHP Assignment operators

Mastering PHP Assignment Operators: A Comprehensive Guide

PHP Assignment operators

PHP Assignment (=):

PHP Addition Assignment (+=):

PHP Subtraction Assignment (-=):

PHP Multiplication Assignment (*=):

PHP Division Assignment (/=):

PHP Modulus Assignment (%=):

PHP Concatenation Assignment (.=):

1. What is the purpose of the basic assignment operator in PHP?

2. Which operator is used for addition assignment in PHP?

4. What does the modulus assignment operator (%=) do in PHP?

5. How is concatenation assignment represented in PHP?

6. What will be the value of $a after the code $a *= 2; if $a was initially 5?

7. Which operator is used for division assignment in PHP?

A) % B) / C) /= D) *=

8. What is the output of the code $str = “Hello “; $str .= “World!”; echo $str;?

9. What is the primary purpose of concatenation assignment?

10. Which assignment operator is used to subtract a value in PHP?

11. What will be the value of $a after the code $a /= 4; if $a was initially 16?

12. What does the code $a %= 3; do?

13. How is the value of $a updated in the code $a += 5; if $a was initially 8?

14. Which assignment operator is used for basic assignment in PHP?

15. What is the purpose of the concatenation operator (.) in PHP?

Answers:

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Modal title

A) %
B) /
C) /=
D) *=