What is the common error message "Parse error: syntax error, unexpected T_ELSEIF" in PHP code and how can it be resolved?

The "Parse error: syntax error, unexpected T_ELSEIF" error in PHP code typically occurs when there is a syntax issue with an elseif statement, such as missing parentheses or curly braces. To resolve this error, ensure that the elseif statement is properly structured with the correct syntax.

// Incorrect code causing the error
if ($condition1) {
    // do something
} elseif ($condition2) {
    // do something else
} else {
    // do another thing
}

// Corrected code with proper syntax
if ($condition1) {
    // do something
} elseif ($condition2) {
    // do something else
} else {
    // do another thing
}