How can the "unexpected T_LNUMBER" error be resolved in PHP code?

The "unexpected T_LNUMBER" error in PHP occurs when a numeric value is used directly in a variable or function name without any preceding characters. To resolve this error, you can prefix the numeric value with a letter or an underscore to make it a valid variable or function name. Example:

$var_123 = 5;
echo $var_123;