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<?php
function check_version() {
    global $wp_version;
    $plugin = plugin_basename( __FILE__ );
    $plugin_data = get_plugin_data( __FILE__, false );

    if ( version_compare($wp_version, "3.0", "<" ) ) {
        if( is_plugin_active($plugin) ) {
            deactivate_plugins( $plugin );
            wp_die( "'".$plugin_data['Name']."' requires WordPress 3.0 or higher! Deactivating Plugin.<br /><br />Back to <a href='".admin_url()."'>WordPress admin</a>." );
        }
    }
}
add_action( 'admin_init', 'check_version' );

<?php
    function always_flush() {
        if( !isset( $this->$flushed ) ) {
            // All this is needed in order that every echo gets sent to the browser.
            // Code taken from php.net user contributed notes.
            @apache_setenv('no-gzip', 1);
            @ini_set('zlib.output_compression', 0);
            @ini_set('implicit_flush', 1);
            wp_ob_end_flush_all();
            ob_implicit_flush(1);
            $this->flushed = true;
        }
    }

<?php
/**
 * trigger_error()
 *
 * @param string $error_msg
 * @param boolean $fatal_error | catched a fatal error - when we exit, then we can't go further than this point
 * @param unknown_type $error_type
 * @return void
 */
function error( $error_msg, $fatal_error = false, $error_type = E_USER_ERROR )  {
    if( isset( $_GET['action'] ) && 'error_scrape' == $_GET['action'] ) {
        echo "{$error_msg}\n";
        if ( $fatal_error )
            exit;
    }
    else {
        trigger_error( $error_msg, $error_type );
    }
}