What are some common reasons for receiving a return value of 1 when using system() in PHP to execute commands?

A common reason for receiving a return value of 1 when using system() in PHP to execute commands is that the command being executed may have failed. This could be due to incorrect syntax, insufficient permissions, or the command simply not being found. To solve this issue, you should check the command being executed for any errors, ensure that the necessary permissions are set, and verify that the command is available in the system's PATH.

// Example code snippet to handle the return value of 1 when using system() in PHP
$output = null;
$return_var = null;
$command = "ls -l"; // Example command to list files
exec($command, $output, $return_var);

if ($return_var == 1) {
    echo "Command failed to execute properly.";
} else {
    foreach ($output as $line) {
        echo $line . "\n";
    }
}