php - PHP中发生错误时如何获取所有变量

Question

我的PHP应用程序中有一个自定义错误处理程序，我想获取错误发生时定义的变量。

为此，我使用以下代码:

    function error_handler($errno, $errstr, $errfile, $errline){
        ..some stuff..
        ob_start();
        var_dump(get_defined_vars());
        $environment = ob_get_clean();
        ..some other stuff..
    } 

发生的情况是，它仅返回在error_handler中定义的变量。我想要的是这段代码返回所有变量，而不仅仅是返回error_handler中定义的变量。这里是否存在我不了解的范围问题，或者该问题来自其他地方？

Answer 1

我通过创建一个文件来修复它，该文件将错误之前与自定义错误处理结合起来存储在每个变量中。

getvars.php :(请注意，这不是一个函数，只是您包含在页面中的一些代码)

<?php
    $variables = get_defined_vars();
    $ignore = array('GLOBALS', '_FILES', '_COOKIE', '_POST', '_GET', '_SERVER', '_ENV', 'ignore');
    // diff the ignore list as keys after merging any missing ones with the defined list
    $vars = array_diff_key($variables + array_flip($ignore), array_flip($ignore));
    $values="";
    foreach ($vars as $var => $value){
        if(!is_array($value) && !is_object($value)){
            $values.=$var."=".strval($value).";";
        }
    }
    //create the file
    $ip=$_SERVER['REMOTE_ADDR'];
    $filename=$_SERVER['DOCUMENT_ROOT']."/tmp/".$ip.".txt";
    $tmpFile = fopen($filename,"wb");
    fwrite($tmpFile,$values);
    fclose($tmpFile);
?>

error_log.php :(自定义错误处理程序)

<?php
    set_error_handler("errorHandler");
    register_shutdown_function("shutdownHandler");
    function errorHandler($error_level, $error_message, $error_file, $error_line, $error_context){
        $error = $error_message." | ".$error_file." | line:".$error_line;
        switch ($error_level) {
            case E_ERROR:
            case E_CORE_ERROR:
            case E_COMPILE_ERROR:
            case E_PARSE:
                mylog($error, "(fatal)");
                break;
            case E_USER_ERROR:
            case E_RECOVERABLE_ERROR:
                mylog($error, "(error)");
                break;
            case E_WARNING:
            case E_CORE_WARNING:
            case E_COMPILE_WARNING:
            case E_USER_WARNING:
                mylog($error, "(warn)");
                break;
            case E_NOTICE:
            case E_USER_NOTICE:
                mylog($error, "(info)");
                break;
            case E_STRICT:
                mylog($error, "(debug)");
                break;
            default:
                mylog($error, "(warn default)");
        }
    }
    function shutdownHandler(){ //will be called when php script ends.
        $lasterror = error_get_last();
        switch ($lasterror['type']){
            case E_ERROR:
            case E_CORE_ERROR:
            case E_COMPILE_ERROR:
            case E_USER_ERROR:
            case E_RECOVERABLE_ERROR:
            case E_WARNING:
            case E_CORE_WARNING:
            case E_COMPILE_WARNING:
            case E_USER_WARNING:
            case E_NOTICE:
            case E_USER_NOTICE:
            case E_STRICT:
            case E_PARSE:
                $error = $lasterror['message']." | ".$lasterror['file']." | line:".$lasterror['line'];
                mylog($error, "fatal");
        }
    }
    function mylog($error, $errlvl){
        $ip=$_SERVER['REMOTE_ADDR'];
        error_log($error." ".$errlvl."\n"."https://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI] ",0);
        $filename=$_SERVER['DOCUMENT_ROOT']."/tmp/".$ip.".txt";
        if (file_exists($filename)){ //read the file and add it to the log
            $file=fopen($filename, "r");
            $variables=fread($file, filesize($filename));
            error_log("Variables: ".$variables,0);
        }
    }
?>

例:

<?php
    $a=1;
    $b=0;
    include("./getvars.php");
    require_once("./error_log.php");
    echo $a/$b; //an error :-)
?>

我希望这对某人仍然有用:-)