PHP中通过trigger_error触发PHP错误示例，trigger_errorphp
PHP中通过trigger_error触发PHP错误示例
【错误抑制符@】
除了 php.ini 中 error_reporting 和 display_errors 的设置、error_reporting() 函数、ini_set() 函数 外，还可以使用错误抑制符@ 屏蔽错误的输出。
@ 加在任何会产生错误的表达式之前。
【通过 trigger_error 触发 PHP 错误】
触发错误的功能不只限于 PHP 解析器，还可以通过 trigger_error() 函数触发错误，类似于异常中抛出的异常一样，抛出了一个错误，可以协助调试代码。
【例】
复制代码 代码如下:
$num1 = 1;
$num2 = '2';
if(!(is_numeric($num1) && is_numeric($num2))){
//手动抛出通知级别的错误
trigger_error('num1 和 num2 必须为合法数值', E_USER_NOTICE);
}else{
echo $num1 + $num2;
}
echo '
程序继续向下执行';
输出：
复制代码 代码如下:
3
程序继续向下执行
而：
复制代码 代码如下:
$num1 = 1;
$num2 = '2a';
if(!(is_numeric($num1) && is_numeric($num2))){
//手动抛出通知级别的错误
trigger_error('num1 和 num2 必须为合法数值', E_USER_NOTICE);
}else{
echo $num1 + $num2;
}
echo '
程序继续向下执行';
输出：
复制代码 代码如下:
( ! ) Notice: num1 和 num2 必须为合法数值 in D:\practise\php\Error\error1.php on line 6
程序继续向下执行
【其他】当数据库连接不上时等严重错误时，可以手动抛出错误 —— 用 E_USER_ERROR 取代 PHP 内置的E_WARNING 警告。
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