What are common causes of the "Parse error: parse error, unexpected T_VARIABLE" in PHP scripts?

The "Parse error: parse error, unexpected T_VARIABLE" in PHP scripts typically occurs when there is a syntax error involving a variable declaration. This error indicates that PHP encountered a variable where it was not expected, often due to missing semicolons, incorrect variable names, or misplaced variables. To resolve this issue, carefully review the code surrounding the variable declaration mentioned in the error message and correct any syntax errors.

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

// Corrected variable declaration with semicolons
$var1 = "Hello";
$var2 = "World";