How can you write a PHP program that stores "Hello" and "World" in two variables and then outputs "Hello World!"?

hard📝 Application Q9 of 15

PHP - Basics and Execution Model

A<?php $a = 'Hello'; $b = 'World'; echo $a + " " + $b + "!"; ?>

B<?php $a = Hello; $b = World; echo $a $b !; ?>

C<?php $a = "Hello"; $b = "World"; echo "$a $b!"; ?>

D<?php $a = "Hello"; $b = "World"; echo $a . " " . $b . "!"; ?>

Step-by-Step Solution

Solution:

Step 1: Assign strings to variables correctly
Variables must have strings in quotes; and C do this correctly.
Step 2: Concatenate variables with space and exclamation
uses dot operator to join strings with space and exclamation; tries to use double quotes with variables inside, which also works but is not in options.
Step 3: Check syntax errors in other options
misses quotes and concatenation; uses + which is invalid for strings in PHP.
Final Answer:
<?php $a = "Hello"; $b = "World"; echo $a . " " . $b . "!"; ?> -> Option D
Quick Check:
Concatenate strings with dot operator [OK]

Quick Trick: Use dot (.) to join strings and variables [OK]

Common Mistakes:

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