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

The error message "Parse error: syntax error, unexpected T_VARIABLE" in PHP code indicates that there is a syntax error related to a variable declaration. This error often occurs when a variable is not properly declared or used in the code. To solve this issue, check the variable declaration and ensure that it follows the correct syntax rules in PHP.

// Incorrect code causing the error
$variable = "Hello World";
echo $variable
```

```php
// Corrected code with proper variable declaration
$variable = "Hello World";
echo $variable;