Are there best practices for naming variables in PHP to avoid conflicts like using numbers at the beginning?

When naming variables in PHP, it is best to follow certain conventions to avoid conflicts and improve code readability. One common practice is to avoid starting variable names with numbers, as PHP variable names cannot begin with a number. Instead, start variable names with a letter or underscore, followed by letters, numbers, or underscores.

// Incorrect variable naming with a number at the beginning
$1variable = 10;

// Correct variable naming without a number at the beginning
$variable1 = 10;