Simple PHP script to test display of errors including a fix for displaying inline errors in HHVM

php-error-test.php

<?php
/*
 * Test display of errors in HHVM/PHP
 * 
 * In HHVM and often in normal PHP I want to see notices and errors inline to the
 * document. This script tests the ability to make errors visible and has a solution
 * that so far works in all the modern PHP and HHVM versions I tried. 
 */
echo "<h1>Error test document for PHP</h1>";

/*
 * SOLUTION: use set_error_handler() to explicitly define our expected behavior
 */
echo "<h2> SOLUTION FOR HHVM: use set_error_handler() to explicitly define our expected behavior</h2>";

echo "<code>set_error_handler(function ($errorNumber, $message, $errfile, $errline) {
    switch ($errorNumber) {
        case E_ERROR :
            $errorLevel = 'Error';
            break;

        case E_WARNING :
            $errorLevel = 'Warning';
            break;

        case E_NOTICE :
            $errorLevel = 'Notice';
            break;

        default :
            $errorLevel = 'Undefined';
    }

    echo '<br/><b>' . $errorLevel . '</b>: ' . $message . ' in <b>'.$errfile . '</b> on line <b>' . $errline . '</b><br/>';
});</code>";
set_error_handler(function ($errorNumber, $message, $errfile, $errline) {
    switch ($errorNumber) {
        case E_ERROR :
            $errorLevel = 'Error';
            break;

        case E_WARNING :
            $errorLevel = 'Warning';
            break;

        case E_NOTICE :
            $errorLevel = 'Notice';
            break;

        default :
            $errorLevel = 'Undefined';
    }

    echo '<br/><b>' . $errorLevel . '</b>: ' . $message . ' in <b>'.$errfile . '</b> on line <b>' . $errline . '</b><br/>';
});


error_reporting(E_ALL);
ini_set("display_errors", "On");

echo "<h2>Test a notice-generating error</h2>";
echo "<code>echo \$undefined_variable;</code>";
echo "<code style='margin:1em;padding:1em;background:#ddd;display:block;'>";
echo $undefined_variable;
echo "</code>";

echo "<h2>Test a fatal error</h2>";

echo "<code>\$not_a_class = '';
\$not_a_class->not_a_method();</code>";

echo "<code style='margin:1em;padding:1em;background:#ddd;display:block;'>";

$not_a_class = '';
$not_a_class->not_a_method();
echo "</code>";
?>