How can PHP beginners avoid syntactical errors when using variables that start with numbers?

PHP beginners can avoid syntactical errors when using variables that start with numbers by following the variable naming rules. Variable names in PHP must start with a letter or an underscore, followed by any combination of letters, numbers, or underscores. If a variable needs to start with a number, it can be prefixed with an underscore or a letter to comply with the naming rules.

// Incorrect variable name starting with a number
$1stNumber = 10;

// Correct variable name starting with an underscore
$_1stNumber = 10;

// Correct variable name starting with a letter
$n1stNumber = 10;