Exception::getTraceAsString

    (PHP 5, PHP 7, PHP 8)

    Exception::getTraceAsString — 获取字符串类型的异常追踪信息

    说明

    final public Exception::getTraceAsString(): string

    以字符串类型返回异常追踪信息。

    参数

    此函数没有参数。

    返回值

    以字符串类型返回异常追踪信息。

    示例

    示例 #1 Exception::getTraceAsString()示例

    <?php
    function test() {
    throw new     Exception;
    }

    try {
    test();
    } catch(    Exception $e) {
    echo     $e->getTraceAsString();
    }
    ?>

    以上示例的输出类似于：

    #0 /home/bjori/tmp/ex.php(7): test()
#1 {main}

    参见

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    用户贡献的备注 2 notes

    up
    49
    ernest at vogelsinger dot at
    10 years ago
    Honestly, Exception::getTraceAsString() simply sucks, listing only the called method (below, for example, on line 89 function fail2() gets called, but there's no information that you have the originator is fail1()). The fact that, in the example below, the exception gets thrown on line 78, is completely omitted from the trace and only available within the exception. Chained exceptions are not supported as well.

    Example:
    #0 /var/htdocs/websites/sbdevel/public/index.php(70): seabird\test\C->exc()
    #1 /var/htdocs/websites/sbdevel/public/index.php(85): seabird\test\C->doexc()
    #2 /var/htdocs/websites/sbdevel/public/index.php(89): seabird\test\fail2()
    #3 /var/htdocs/websites/sbdevel/public/index.php(93): seabird\test\fail1()
    #4 {main}

    jTraceEx() provides a much better java-like stack trace that includes support for chained exceptions:
    Exception: Thrown from class C
    at seabird.test.C.exc(index.php:78)
    at seabird.test.C.doexc(index.php:70)
    at seabird.test.fail2(index.php:85)
    at seabird.test.fail1(index.php:89)
    at (main)(index.php:93)
    Caused by: Exception: Thrown from class B
    at seabird.test.B.exc(index.php:64)
    at seabird.test.C.exc(index.php:75)
    ... 4 more
    Caused by: Exception: Thrown from class A
    at seabird.test.A.exc(index.php:46)
    at seabird.test.B.exc(index.php:61)
    ... 5 more

    (see at the end for the example code)

    <?php
    /**
    * jTraceEx() - provide a Java style exception trace
    * @param $exception
    * @param $seen - array passed to recursive calls to accumulate trace lines already seen
    * leave as NULL when calling this function
    * @return array of strings, one entry per trace line
    */
    function jTraceEx($e, $seen=null) {
    $starter = $seen ? 'Caused by: ' : '';
    $result = array();
    if (!    $seen) $seen = array();
    $trace = $e->getTrace();
    $prev = $e->getPrevious();
    $result[] = sprintf('%s%s: %s', $starter, get_class($e), $e->getMessage());
    $file = $e->getFile();
    $line = $e->getLine();
    while (    true) {
    $current = "$file:$line";
    if (    is_array($seen) && in_array($current, $seen)) {
    $result[] = sprintf(' ... %d more', count($trace)+1);
    break;
    }
    $result[] = sprintf(' at %s%s%s(%s%s%s)',
    count($trace) && array_key_exists('class', $trace[0]) ? str_replace('\\', '.', $trace[0]['class']) : '',
    count($trace) && array_key_exists('class', $trace[0]) && array_key_exists('function', $trace[0]) ? '.' : '',
    count($trace) && array_key_exists('function', $trace[0]) ? str_replace('\\', '.', $trace[0]['function']) : '(main)',
    $line === null ? $file : basename($file),
    $line === null ? '' : ':',
    $line === null ? '' : $line);
    if (    is_array($seen))
    $seen[] = "$file:$line";
    if (!    count($trace))
    break;
    $file = array_key_exists('file', $trace[0]) ? $trace[0]['file'] : 'Unknown Source';
    $line = array_key_exists('file', $trace[0]) && array_key_exists('line', $trace[0]) && $trace[0]['line'] ? $trace[0]['line'] : null;
    array_shift($trace);
    }
    $result = join("\n", $result);
    if (    $prev)
    $result .= "\n" . jTraceEx($prev, $seen);

    return     $result;
    }
    ?>

    Here's the example code:
    <?php
    class A {
    public function     exc() {
    throw new     \Exception('Thrown from class A'); // <-- line 46
    }
    }

    class     B {
    public function     exc() {
    try {
    $a = new A;
    $a->exc(); // <-- line 61
    }
    catch(    \Exception $e1) {
    throw new     \Exception('Thrown from class B', 0, $e1); // <-- line 64
    }
    }
    }
    class     C {
    public function     doexc() {
    $this->exc(); // <-- line 70
    }
    public function     exc() {
    try {
    $b = new B;
    $b->exc(); // <-- line 75
    }
    catch(    \Exception $e1) {
    throw new     \Exception('Thrown from class C', 0, $e1); // <-- line 78
    }
    }
    }

    function     fail2() {
    $c = new C;
    $c->doexc(); // <-- line 85
    }

    function     fail1() {
    fail2(); // <-- line 89
    }

    try {
    fail1(); // <-- line 93
    }
    catch(    \Exception $e) {
    echo     jTraceEx($e);
    }
    ?>
    up
    6
    cottton at i-stats dot net
    9 years ago
    this method uses \n for new line (i expected PHP_EOL but well ...).
    if you want to log the string as one single line use something like:
    <?php
    $separator     = ', ';
    $one_line = str_replace("\n", $separator, $e->getTraceAsString());
    ?>
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