What are some common techniques for debugging variable-related issues in PHP scripts?

One common technique for debugging variable-related issues in PHP scripts is to use var_dump() or print_r() to display the contents of the variable at different points in the script to see how its value changes. Another technique is to check for typos or syntax errors in variable names, as PHP is case-sensitive. Additionally, using error_reporting(E_ALL) at the beginning of the script can help identify any uninitialized variables.

// Using var_dump() to display the contents of a variable
$variable = "Hello, World!";
var_dump($variable);

// Checking for typos in variable names
$Variable = "This is a different variable.";
echo $variable; // This will throw an error due to the typo in the variable name

// Using error_reporting(E_ALL) to identify uninitialized variables
error_reporting(E_ALL);
echo $uninitializedVariable; // This will generate a notice about an uninitialized variable