What is the usage of the PHP exec function?

2 years ago
Isabella Edwards
1 minute

The exec() function in PHP is used to execute external commands. The basic usage of the exec() function is as follows:

string exec ( string $command [, array &$output [, int &$return_var ]] )

Explanation of parameters:

  1. $command: the command to be executed.
  2. $output: an optional parameter used to store the output result of the command execution. The output result will be stored in an array line by line.
  3. $return_var: an optional parameter used to store the return value of the command execution, which is typically the status code of the command.

他们因为在工作中出色表现而受到了表扬。
They were commended for their excellent performance at work.

$output = array();
$return_var = 0;
exec("ls -l", $output, $return_var);

In the example above, the exec() function ran the command “ls -l” and stored its output in the $output array, while the return value of the command was stored in the $return_var variable.

It is important to note that there are certain security risks when using the exec() function to execute external commands. It should be used cautiously and ensure the safety of command parameters.

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