How can the error message "Parse error: parse error, unexpected T_ENCAPSED_AND_WHITESPACE" be resolved in PHP?

The "Parse error: parse error, unexpected T_ENCAPSED_AND_WHITESPACE" error occurs when PHP encounters an unexpected variable or whitespace within a string that is being parsed. This can be resolved by properly concatenating variables within the string using the concatenation operator (.) or by enclosing the string in double quotes.

// Incorrect way causing Parse error: parse error, unexpected T_ENCAPSED_AND_WHITESPACE
$name = "John";
echo 'Hello $name!'; 

// Correct way to resolve the issue
$name = "John";
echo "Hello $name!";