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# PEAR_Dependency::checkOS()

PEAR_Dependency::checkOS() -- Check Operating system dependency

## Synopsis

    require_once 'PEAR/Dependency.php';

``mixed PEAR_Dependency::checkOS` (string &$errmsg, string $os)`

## Description

Operating system dependencies check method

## Parameter

string `&$errmsg`

  this variable will contains an error message, if check fail

string `$os`

  Name of the operating system

## Return value

`mixed` - `FALSE` if dependency could be resolved successfully(!); or an `PEAR_DEPENDENCY_*` constant in case of unresolved dependency.

## Note

This function can not be called statically.

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