The PHP connection_status() function returns the current connection status.

Values that can be returned are:

• 0 – CONNECTION_NORMAL – connection is running normally
• 1 – CONNECTION_ABORTED – connection is aborted by user or network error
• 2 – CONNECTION_TIMEOUT – connection timed out
• 3 – CONNECTION_ABORTED & CONNECTION_TIMEOUT

<?php
switch (connection_status()) {
    case CONNECTION_NORMAL:
        $txt = 'Connection is in a normal state';
        break;
    case CONNECTION_ABORTED:
        $txt = 'Connection aborted';
        break;
    case CONNECTION_TIMEOUT:
        $txt = 'Connection timed out';
        break;
    case (CONNECTION_ABORTED & CONNECTION_TIMEOUT):
        $txt = 'Connection aborted and timed out';
        break;
    default:
        $txt = 'Unknown';
        break;
}

echo $txt;
?>

connection_status()