Best way to abort plugin in case of insufficient PHP version?

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You write a plugin which requires PHP 5.1. Someone tries to install it on a server with PHP 4. How do you deal with that in a safe and user-friendly manner?

4

This function and activation hook prevents the plugin from activating and allows you to check for both a minimum PHP and WordPress version.

register_activation_hook( __FILE__, array( 'Your_Plugin_Class_Name', 'activate' ) );

/**
  * Plugin Activation hook function to check for Minimum PHP and WordPress versions
  * @param string $wp Minimum version of WordPress required for this plugin
  * @param string $php Minimum version of PHP required for this plugin
  */
 function activate( $wp = '3.1', $php = '5.2.4' ) {
    global $wp_version;
    if ( version_compare( PHP_VERSION, $php, '<' ) )
        $flag = 'PHP';
    elseif
        ( version_compare( $wp_version, $wp, '<' ) )
        $flag = 'WordPress';
    else
        return;
    $version = 'PHP' == $flag ? $php : $wp;
    deactivate_plugins( basename( __FILE__ ) );
    wp_die('<p>The <strong>Insert PLugin Name Here</strong> plugin requires'.$flag.'  version '.$version.' or greater.</p>','Plugin Activation Error',  array( 'response'=>200, 'back_link'=>TRUE ) );
}

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