'print_r' => ['string|true', 'var'=>'mixed', 'return='=>'bool'],

'printf' => ['int', 'format'=>'string', '...args='=>'string|int|float'],

'proc_close' => ['int', 'process'=>'resource'],

'proc_nice' => ['bool', 'priority'=>'int'],

'proc_open' => ['resource|false', 'command'=>'string', 'descriptorspec'=>'array', '&w_pipes'=>'resource[]', 'cwd='=>'?string', 'env='=>'?array', 'other_options='=>'array'],

'proc_terminate' => ['bool', 'process'=>'resource', 'signal='=>'int'],