function scald_file_command_exists in Scald File Provider 7

Determines if a command exists on the current environment.

@codingStandardsIgnoreStart

Source: http://stackoverflow.com/questions/12424787/how-to-check-if-a-shell-comm...

Parameters

string $command: The command to check.

Return value

bool True if the command has been found ; otherwise, false.

1 call to scald_file_command_exists()

_scald_file_pdf_thumbnail in ./scald_file.module

Generate a thumbnail for a pdf file.

File

./scald_file.module, line 488

Scald File is a Scald Atom Provider for Files.

Code

function scald_file_command_exists($command) {
  $whereIsCommand = PHP_OS == 'WINNT' ? 'where' : 'which';

  // @codingStandardsIgnoreEnd
  $process = proc_open("{$whereIsCommand} {$command}", array(
    // STDIN.
    0 => array(
      "pipe",
      "r",
    ),
    // STDOUT.
    1 => array(
      "pipe",
      "w",
    ),
    // STDERR.
    2 => array(
      "pipe",
      "w",
    ),
  ), $pipes);
  if ($process !== FALSE) {
    $stdout = stream_get_contents($pipes[1]);
    $stderr = stream_get_contents($pipes[2]);
    fclose($pipes[1]);
    fclose($pipes[2]);
    proc_close($process);
    return $stdout != '';
  }
  return FALSE;
}