What role does the trim() function play in resolving issues with shell_exec and variable names in PHP?

When using shell_exec in PHP, it's important to be mindful of any whitespace or newline characters that might be present in the output. One common issue is when assigning the output of shell_exec to a variable, as trailing whitespace or newlines can cause unexpected behavior. To resolve this, you can use the trim() function to remove any leading or trailing whitespace from the output before assigning it to a variable.

$output = shell_exec("your_command_here");
$output = trim($output);