How can one avoid parse errors in PHP code when dealing with strings, variables, or numerical strings?

Parse errors in PHP code can often occur when dealing with strings, variables, or numerical strings due to incorrect syntax or improper concatenation. To avoid these errors, it is important to properly escape special characters in strings, use concatenation operators correctly, and ensure that variables are properly interpolated within strings. Additionally, using functions like `sprintf()` can help in formatting numerical strings without causing parse errors.

// Example of avoiding parse errors in PHP code when dealing with strings, variables, or numerical strings

$name = "John";
$age = 30;

// Correct way to concatenate variables within a string
echo "My name is $name and I am $age years old.";

// Using sprintf() to format numerical strings
$number = 12345.67;
echo sprintf("The number is %.2f", $number);