What potential error did user #3 identify in the code snippet provided?

User #3 identified that the code snippet is missing the closing parenthesis for the `if` statement. To fix this issue, we need to add the closing parenthesis to ensure that the conditional statement is properly closed. 

if ($age >= 18) {
    echo "You are an adult.";
} else {
    echo "You are not an adult.";
}

Keywords

syntax error missing semicolon PHP_EOL echo concatenation

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