What is the significance of the error message "Parse error: parse error, unexpected T_VARIABLE" in PHP?

The error message "Parse error: parse error, unexpected T_VARIABLE" in PHP typically indicates a syntax error where a variable is used incorrectly or in an unexpected way. This can happen if a variable is not properly declared, or if there is a missing or extra character in the variable declaration. To solve this issue, carefully review the code where the error is occurring and ensure that all variables are properly declared and used according to PHP syntax rules.

// Incorrect variable declaration causing parse error
$var1 = "Hello";
$var2 = $var1 + 5; // Parse error: parse error, unexpected T_VARIABLE

// Correct variable declaration
$var1 = "Hello";
$var2 = $var1 . "5"; // Concatenating the string "5" to $var1
echo $var2; // Output: Hello5