What are some common debugging techniques in PHP to identify errors in code, such as missing variables or syntax errors?

One common debugging technique in PHP is to use error reporting to display any errors or warnings that occur in the code. This can be done by setting the error_reporting level to E_ALL and displaying errors using the ini_set function. Additionally, using functions like var_dump or print_r can help identify the values of variables at different points in the code.

// Enable error reporting
error_reporting(E_ALL);
ini_set('display_errors', 1);

// Example code snippet with var_dump to display variable values
$variable = "Hello";
var_dump($variable);