Zend Preparation | PHP Quiz (Learning Mode)

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Qusetions Index 18/260

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What is the output of the following PHP code?

<?php
    define('FOO', 10);
    $array = array(10 => FOO,"FOO" => 20);
    print $array[$array[FOO]] * $array["FOO"];
?>

FOO

100

200

Explanation: A constant can be defined by using the define() function. The define function is used to define a named constant. The syntax of the define function is as follows:

bool define ( string $name , mixed $value [, bool $case_insensitive = false ] )

To define the case-sensitive constant, you will write the code like this:

<?php
 define("GREETING","How are you today?");
 echo constant("GREETING");
?>

To define the case-insensitive constant, you will write the code like this:

<?php
 define("GREETING","How are you today?",TRUE);
 echo constant("greeting");
?>

In this question, $array["FOO"] = 20 and $array[$array[FOO]] = 10, because FOO is constant with value 10 $array[$array[10]] * $array["FOO"]; so 200.