Exception::__toString

    (PHP 5, PHP 7, PHP 8)

    Exception::__toString — 将异常对象转换为字符串

    说明

    public Exception::__toString(): string

    返回转换为字符串（string）类型的异常。

    参数

    此函数没有参数。

    返回值

    返回转换为字符串（string）类型的异常。

    示例

    示例 #1 Exception::__toString()示例

    <?php
    try {
    throw new     Exception("Some error message");
    } catch(    Exception $e) {
    echo     $e;
    }
    ?>

    以上示例的输出类似于：

    exception 'Exception' with message 'Some error message' in /home/bjori/tmp/ex.php:3
Stack trace:
#0 {main}

    参见

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    User Contributed Notes 1 note

    up
    0
    devnull
    18 days ago
    The Exception __toString implementation will also include the string representation of previous exceptions chained to this exception, _before_ the string representation of the current exception.

    For example:

    <?php
    class OuterException extends Exception {}
    class     MiddleException extends Exception {}
    class     InnerException extends Exception {}

    $excA = new InnerException("inner exception", 0);
    $excB = new MiddleException("middle exception", 0, $excA);
    $excC = new OuterException("outer exception", 0, $excB);

    echo     "The exception is:\n$excC";
    ?>

    will print the following:

    The exception is:
    InnerException: inner exception in test.php:6
    Stack trace:
    #0 {main}

    Next MiddleException: middle exception in test.php:7
    Stack trace:
    #0 {main}

    Next OuterException: outer exception in test.php:8
    Stack trace:
    #0 {main}
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