PHP错误实例详解错误级别配置项设置错误级别手动触发PHP错误自定义错误处理器脚本即将关闭前执行的函数

; Error Level Constants:
; E_ALL             - All errors and warnings (includes E_STRICT as of PHP 5.4.0)
; E_ERROR           - fatal run-time errors
; E_RECOVERABLE_ERROR  - almost fatal run-time errors
; E_WARNING         - run-time warnings (non-fatal errors)
; E_PARSE           - compile-time parse errors
; E_NOTICE          - run-time notices (these are warnings which often result
;                     from a bug in your code, but it's possible that it was
;                     intentional (e.g., using an uninitialized variable and
;                     relying on the fact it is automatically initialized to an
;                     empty string)
; E_STRICT          - run-time notices, enable to have PHP suggest changes
;                     to your code which will ensure the best interoperability
;                     and forward compatibility of your code
; E_CORE_ERROR      - fatal errors that occur during PHP's initial startup
; E_CORE_WARNING    - warnings (non-fatal errors) that occur during PHP's
; E_STRICT          - run-time notices, enable to have PHP suggest changes
;                     to your code which will ensure the best interoperability
;                     and forward compatibility of your code
; E_CORE_ERROR      - fatal errors that occur during PHP's initial startup
; E_CORE_WARNING    - warnings (non-fatal errors) that occur during PHP's
;                     initial startup
; E_COMPILE_ERROR   - fatal compile-time errors
; E_COMPILE_WARNING - compile-time warnings (non-fatal errors)
; E_USER_ERROR      - user-generated error message
; E_USER_WARNING    - user-generated warning message
; E_USER_NOTICE     - user-generated notice message
; E_DEPRECATED      - warn about code that will not work in future versions
;                     of PHP
; E_USER_DEPRECATED - user-generated deprecation warnings

echo error_reporting(); // 结果是用数字值表示
echo "<br/>";
error_reporting(E_ALL);
echo $test; // 报Notice错误
echo "<br/>";
error_reporting(E_ALL & ~ E_NOTICE); // NOTICE级别错误不显示
echo $name; // 不会报错

error_reporting(0); // 不显示所有错误
settype($var, 'test'); // 不报错
error_reporting(-1); // 显示所有错误
settype($var, 'test'); // warning错误

echo "continue"; // 非致命错误，程序会继续往下跑

ini_set('error_reporting', -1);
ini_set('display_errors', 0); // 不显示错误
echo $name;
ini_set('display_errors', 1); // 显示错误
echo $age;

md6('md5有md6厉害吗？');
echo "程序还能往下跑？"; // Fatal error，此行不会运行

header('content-type:text/html;charset=utf-8');
$name = '张飞';
$gender = '女';
trigger_error('扯淡，张飞是猛男', E_USER_ERROR); // 自定义的Fatal error
echo "还能运行吗?"; // 不会运行

header('content-type:text/html;charset=utf-8');
error_reporting(-1);
function customError($errno, $errmsg, $file, $line) {
    echo "错误代码：[{$errno}] {$errmsg}<br>";
    echo "错误行号：{$file} 文件中的第{$line}行<br>";
    echo "PHP版本" . PHP_VERSION . "(" . PHP_OS . ")<br>";
}
set_error_handler('customError');

// NOTICE 和 Warning级别被有自定义的错误处理器接管
echo $test;
settype($var, 'test');

md6('又来加密了'); // Fatal error不会被自定义的错误处理器接管

class Shutdown {
    public static function doSomething()
    {
        echo "我觉得我还可以再抢救下";
    }
}

echo "就到这里吧，一切都结束了<br />";
register_shutdown_function(['Shutdown', 'doSomething']);

就到这里吧，一切都结束了
我觉得我还可以再抢救下