What are some common debugging techniques for identifying issues with variables in PHP scripts?

One common debugging technique for identifying issues with variables in PHP scripts is to use var_dump() or print_r() to display the contents of the variable and its data type. This can help identify if the variable is set correctly or if its value is what you expect. Another technique is to use error_reporting(E_ALL) to display all errors and warnings, which can help pinpoint where the issue is occurring. Additionally, using die() or exit() statements at various points in the script can help isolate the problem area.

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

// Using error_reporting(E_ALL) to display all errors and warnings
error_reporting(E_ALL);

// Using die() to stop the script and display a message
$variable = "Hello World";
if ($variable != "Hello World") {
    die("Variable is not set correctly!");
}