php - 错误 500 : Premature end of script headers

Question

我在运行以下脚本时收到“脚本头过早结束:contactform.cgi”错误消息。令我沮丧的是，我在另一台服务器上将其作为 .php 运行，并且它有效。但是，我不得不更改服务器，它们只支持 CGI PHP。但是，它不起作用。我认为代码没有错，但以防万一。

我已经阅读过，有些人说这是权限问题。对我来说会是这样吗？

我知道 "display_errors"和 "error_reporting"语句会在错误日志中显示错误，但是如果我无权访问服务器，如何查看日志？

#!/usr/local/bin/php

<?php

print "Content-type: text/html\n\n";
use CGI::Carp qw(fatalsToBrowser);
ini_set('display_errors',1);
error_reporting(E_ALL);

if(isset($_POST['email'])) {

//Email this form to me
$email_to = "myemail@site.com";

function died($error) {
    // your error code can go here
    echo "Oops... something's wrong. ";
    echo "Fix the error(s) below:<br /><br />";
    echo $error."<br /><br />";
    die();
}


// validation expected data exists
if(!isset($_POST['first_name']) ||
    !isset($_POST['last_name']) ||
    !isset($_POST['email']) ||
    !isset($_POST['subject']) ||
    !isset($_POST['comments'])) {
    died('There appears to be a problem with the form you submitted.');       
}


$first_name = $_POST['first_name']; // required
$last_name = $_POST['last_name']; // required
$email_from = $_POST['email']; // required
$subject = $_POST['subject']; // not required
$comments = $_POST['comments']; // required

$error_message = "";
$email_exp = '/^[A-Za-z0-9._%-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}$/';
if(!preg_match($email_exp,$email_from)) {
$error_message .= 'The Email Address you entered does not appear to be valid.<br />';
}
$string_exp = "/^[A-Za-z .'-]+$/";
if(!preg_match($string_exp,$first_name)) {
$error_message .= 'The First Name you entered does not appear to be valid.<br />';
}
if(!preg_match($string_exp,$last_name)) {
$error_message .= 'The Last Name you entered does not appear to be valid.<br />';
}
if(strlen($comments) < 2) {
$error_message .= 'The Comments you entered do not appear to be valid.<br />';
}
if(strlen($error_message) > 0) {
died($error_message);
}


$email_message = "Form details below.\n\n";

function clean_string($string) {
  $bad = array("content-type","bcc:","to:","cc:","href");
  return str_replace($bad,"",$string);
}

$email_message .= "First Name: ".clean_string($first_name)."\n";
$email_message .= "Last Name: ".clean_string($last_name)."\n";
$email_message .= "Email: ".clean_string($email_from)."\n";
$email_message .= "Subject: ".clean_string($subject)."\n";
$email_message .= "Comments: ".clean_string($comments)."\n";

//Email Subject (put here to include subject from form)
$email_subject = "SUBJECT | ".clean_string($subject)."";


// create email headers
$headers = 'From: '.$email_from."\r\n".
'Reply-To: '.$email_from."\r\n" .
'X-Mailer: PHP/' . phpversion();
@mail($email_to, $email_subject, $email_message, $headers);
?>

<!-- include your own success html here -->

<?php
header("Location: thankyou.html");
}
?>

Answer 1

这是文件权限问题。

我网站上的所有文件都设置为“644”权限级别。一旦我将权限级别更改为 705 ( chmod 705 )，一切正常。请注意，我将其更改为 705，但 755 也可以。我还将它所在的文件夹更改为 701(隐藏它，但仍然可以由服务器执行)。

_{旁白:我仍然不明白为什么我的 .PHP 文件在可能设置为 644 的情况下可以在另一台服务器上运行？ Apache如何在没有世界许可的情况下执行脚本？ Apache不需要世界许可吗？我还有几个问题...}