What is the purpose of defining the content of a variable in PHP?

Defining the content of a variable in PHP is important because it allows the programmer to assign a specific value to the variable, which can then be used throughout the code. This helps in maintaining consistency and clarity in the code, as well as preventing errors that may occur due to undefined variables. By defining the content of a variable, the programmer can ensure that the variable will hold the intended value when it is accessed or manipulated.

// Defining the content of a variable
$myVariable = "Hello, world!";