What is the difference between $

The difference between $ and $? in PHP relates to variable usage and indicates different types of information within programming contexts.

keywords: PHP, $variable, $? return status, variable scope, programming
description: This article explains the difference between $ and $? in PHP, including their usage and significance in programming.

Here's a simple example demonstrating the concepts:

<?php // Using a variable $value = 5; // $ notation to define a variable // Example of $? $command = 'ls'; // Sample command system($command); // Execute command if ($? == 0) { // $? to check the exit status of the last command echo "Command executed successfully!"; } else { echo "Command failed!"; } ?>

keywords: PHP $variable $? return status variable scope programming

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