<?php
    //using a boolean variable to check if the site's online or not
    $isAlive=FALSE;

    ////////////////////////////////////////////////////////////////////////
    //This function will handle all the errors//////////////////////////////
    //that may occur in the site's functioning./////////////////////////////
    //$errorNumber - shows the error's number///////////////////////////////
    //$errorMessage - shows what message the error holds////////////////////
    //$errorFile - shows what file's generating the error///////////////////
    //$errorLine - shows what line in $errorFile's generating the error/////
    //$errorVar - shows what variable in $errorLine's generating the error//
    ////////////////////////////////////////////////////////////////////////
    function errorHandler($errorNumber, $errorMessage, $errorFile, $errorLine, $errorVar)
    {
        global $isAlive;
        //building the error message
        $message="An error occured in script '$errorFile' on line $errorLine: $errorMessage\n";
        $message.=print_r($errorVar, 1);
        if($isAlive) {//we won't be showing the error
            echo '<div class="error">A system error occured. We apologize for the trouble we caused you.';
        } else {//we're showing the error
            echo '<div class="error">' . $message . '</div><br />';
        }
    }

    set_error_handler('errorHandler');
?>