Description:
------------
---
From manual page: https://php.net/function.exec
---
The documentation specifies syntax
exec ( string $command [, array &$output [, int &$return_var ]] ) : string

This syntax breaks PHP, and according to numerous internet articles like https://stackoverflow.com/questions/8971261/php-5-4-call-time-pass-by-reference-easy-fix-available explaining it has been so a while:
> As of PHP 5.3.0, you will get a warning saying that "call-time pass-by-reference" is deprecated when you use & in foo(&$a);.

Please update the documentation with correct syntax, and if/when it differs for specific versions, please note the version and change in question - now it incorrectly claims to be valid for "(PHP 4, PHP 5, PHP 7)"



Test script:
---------------
$ cat > test-ref-arg.php
<?php
  exec ( "pwd", &$output );  
  echo "Got output: ";
  var_dump($output);

$ php test-ref-arg.php
PHP Fatal error:  Call-time pass-by-reference has been removed in /home/xx/IMPORT/test-ref-arg on line 2

/opt/rh/rh-php73/root/bin/php test-ref-arg.php
PHP Parse error:  syntax error, unexpected '&', expecting ')' in /home/xx/test-ref-arg.php on line 2