How can PHP beginners avoid common errors related to variable initialization and constant usage?

PHP beginners can avoid common errors related to variable initialization by always declaring variables before using them and ensuring that they are properly initialized. For constants, it's important to define them using the define() function and use them consistently throughout the code. 

// Variable initialization
$name = "John Doe";
$age = 25;

// Constant usage
define('PI', 3.14);

echo "Name: " . $name . "<br>";
echo "Age: " . $age . "<br>";
echo "Value of PI: " . PI;

Keywords

PHP variable initialization constant usage error handling debugging

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