What potential issues or errors could arise from the code snippet?

The code snippet is missing a closing curly brace for the if statement, which could lead to a syntax error. To fix this issue, we need to add a closing curly brace to properly close the if statement. 

// Potential issue: Missing closing curly brace for the if statement
if ($user_age >= 18) {
    echo "User is an adult.";
} // Missing closing curly brace

// Corrected code snippet
if ($user_age >= 18) {
    echo "User is an adult.";
}

Keywords

syntax error undefined variable missing semicolon function not found fatal error

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