PHP 오류 유형 및 보고

<?php
// Show all errors (development)
error_reporting(E_ALL);

// Hide notices and deprecated
error_reporting(E_ALL & ~E_NOTICE & ~E_DEPRECATED);

// Production: no display, log to file
error_reporting(E_ALL);
ini_set('display_errors', '0');
ini_set('log_errors', '1');
ini_set('error_log', '/var/log/php_errors.log');

<?php
function divide(int $a, int $b): float {
    if ($b === 0) {
        trigger_error('Division by zero', E_USER_WARNING);
        return 0.0;
    }
    return $a / $b;
}

echo divide(10, 0);  // triggers E_USER_WARNING

<?php
set_error_handler(function(int $errno, string $errstr, string $file, int $line): bool {
    $message = "[$errno] $errstr in $file:$line";
    error_log($message);
    if ($errno === E_USER_ERROR) {
        http_response_code(500);
        die('Internal error — please try again later');
    }
    return true;  // don't execute PHP internal error handler
});

trigger_error('Custom error message', E_USER_ERROR);

<?php
// Bad: hides errors silently
$result = @file_get_contents('missing.txt');

// Good: check explicitly
$result = file_get_contents('missing.txt');
if ($result === false) {
    // handle the error
    echo 'File not found';
}

<?php
// Display errors during development
if (getenv('APP_ENV') === 'development') {
    ini_set('display_errors', '1');
    ini_set('display_startup_errors', '1');
    error_reporting(E_ALL);
} else {
    ini_set('display_errors', '0');
    ini_set('log_errors', '1');
    error_reporting(E_ALL);
}

<?php
$level = error_reporting();

if ($level & E_NOTICE) {
    echo 'Notices are reported';
}
if ($level & E_WARNING) {
    echo 'Warnings are reported';
}

// Check specific error types
echo (E_ALL & E_NOTICE) ? 'E_ALL includes E_NOTICE' : 'no';