What does the error message "Parse error: parse error, unexpected '\"', expecting T_STRING or T_VARIABLE or T_NUM_STRING" indicate in PHP programming?

The error message "Parse error: parse error, unexpected '\"', expecting T_STRING or T_VARIABLE or T_NUM_STRING" in PHP indicates that there is a syntax error in the code where a double quote ("") is used incorrectly. To solve this issue, you should check the line mentioned in the error message and ensure that the double quotes are used properly, either for enclosing strings or concatenating variables. Example PHP code snippet:

// Incorrect usage of double quotes causing the parse error
$variable = "Hello "World"";

// Corrected code using escape character to fix the syntax error
$variable = "Hello \"World\"";