Zend Preparation | PHP Quiz (Learning Mode)

PHP Basics Learning Mode

Qusetions Index 14/260

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Mark works as a Web Application Developer for Blue Solutions Inc. He writes the following code:

<?php
    $x =25;
    while($x<10)
    {
        $x--;
    }
    print ($x); 
?>

What will be the output when Mark tries to compile and execute the code?

The script will throw an error message.

Explanation: The while statement executes a block of statements when the condition is true. The while statement evaluates the expression which returns a boolean value. If the expression in the while block evaluates to true, the while statement executes the statements in the while block. The while statement keeps on executing the block until the expression evaluates to false. In the above code, the expression in the while statement evaluates to false and hence 25 is printed to the output.

The while loop is the most basic looping statement. It repeats a statement till its controlling expression is true. The general form of the while loop is as follows:

while (condition) {
//body of the loop
}

Here, the condition can be any Boolean expression. The body of the loop will execute till the condition is true. When the condition turns out to be false, control is transferred to the next line of the code after the while loop. Curly braces are not required if only a single statement is repeated.

The PHP compiler first checks the while conditional expression at the beginning of the while loop. Therefore, if the while condition is found false in the beginning itself, the body of the while loop will not be executed at all.

The body of a while loop can be empty. In PHP, a null statement (one that consists of only a semicolon) is valid.

Answer options B, D, and C are incorrect. The given code snippet will compile successfully and display 25 as output.