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Introduction to PHP

bookMath Expressions

We also can write math expressions. The sequence of actions will work the same as in mathematics, where 2 + 2 * 2 = 6, because the multiplication is done before the addition.

main.php

main.php

copy

              
123

            
<?php
echo 2 + 2 * 2;
?>

Let's look at a more complex example:

main.php

main.php

copy

              
123

            
<?php
echo (12 + 6) * 2 - 10 / 5 + 2;
?>

First, in the expression (12 + 6) * 2 - 10 / 5 + 2, we perform the operations inside the parentheses. Adding 12 and 6 gives us 18. So, the expression now looks like 18 * 2 - 10 / 5 + 2.

Next, according to the rules of operator precedence, we handle multiplication and division from left to right. First, we calculate 18 * 2, which equals 36. Then, we compute 10 / 5, which equals 2. Thus, our expression transforms into 36 - 2 + 2.

Moving forward, we perform subtraction: 36 - 2, resulting in 34. Finally, we add 2 to 34, giving us the final result of 36.

Therefore, the expression (12 + 6) * 2 - 10 / 5 + 2 evaluates to 36.

question mark

Consider the following PHP expression:

Select the correct answer

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Tak for dine kommentarer!

Sektion 1. Kapitel 5

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bookMath Expressions

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We also can write math expressions. The sequence of actions will work the same as in mathematics, where 2 + 2 * 2 = 6, because the multiplication is done before the addition.

main.php

main.php

copy

              
123

            
<?php
echo 2 + 2 * 2;
?>

Let's look at a more complex example:

main.php

main.php

copy

              
123

            
<?php
echo (12 + 6) * 2 - 10 / 5 + 2;
?>

First, in the expression (12 + 6) * 2 - 10 / 5 + 2, we perform the operations inside the parentheses. Adding 12 and 6 gives us 18. So, the expression now looks like 18 * 2 - 10 / 5 + 2.

Next, according to the rules of operator precedence, we handle multiplication and division from left to right. First, we calculate 18 * 2, which equals 36. Then, we compute 10 / 5, which equals 2. Thus, our expression transforms into 36 - 2 + 2.

Moving forward, we perform subtraction: 36 - 2, resulting in 34. Finally, we add 2 to 34, giving us the final result of 36.

Therefore, the expression (12 + 6) * 2 - 10 / 5 + 2 evaluates to 36.

question mark

Consider the following PHP expression:

Select the correct answer

Var alt klart?

Hvordan kan vi forbedre det?

Tak for dine kommentarer!

Sektion 1. Kapitel 5
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