How can users troubleshoot and resolve "command not found" errors when using exec() or passthru() functions in PHP?

When using the exec() or passthru() functions in PHP, a "command not found" error can occur if the specified command is not recognized by the system. To troubleshoot and resolve this issue, ensure that the command is properly installed on the server and that the correct path to the command is specified in the PHP code. 

// Example code snippet to resolve "command not found" error in PHP
$command = 'ls -l'; // Example command that may result in "command not found" error
$output = [];
$return_var = 0;
exec($command, $output, $return_var);

if ($return_var !== 0) {
    echo "Error executing command: $command";
} else {
    foreach ($output as $line) {
        echo $line . PHP_EOL;
    }
}

Keywords

exec passthru command not found troubleshooting resolve

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