Warning: Cannot modify header information - headers already sent by
如果在执行php程序时看到这条警告:"Warning: Cannot modify header information - headers already sent by ....".
有以下几种解决方法:
1. Blank lines (空白行):
,检查 后面没有空白行,特别是include或者require的文件.不少问题是这些空白行导致的。
2. Use exit statement (用exit来解决):在header后加上exit();
header ("Location: xxx");exit();
3.用Javascrīpt来解决:
self.location( file.php );"; ?>
可以用Javascrīpt来代替header。另外需要注意,采用这种方法需要浏览器支持Javascrīpt.
4. 用输出缓存来解决:
<?php ... HTML codes ... ... PHP codes ... header ("Location: ...."); ob_end_flush(); ?>
永久地址:
转载随意~请带上教程地址吧^^

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

PHPWarning:Invalidargumentsuppliedforforeach()-Solution When developing web pages or applications using PHP, you often encounter various errors and warnings. One of the common warnings is "Invalidargumentsuppliedforforeach()", which is usually produced when using a foreach loop to iterate over an array. This question seems simple, but if you don't

How to solve PHPWarning:fopen():SSLoperationfailedinfile.phponlineX In PHP programming, we often use the fopen function to open files or URLs and perform related operations. However, when using the fopen function, sometimes you will encounter something similar to Warning:fopen():SSLoperationfailedinfile.p

How to solve PHPWarning:file_get_contents():failedtoopenstream:HTTPrequestfailed During PHP development, we often encounter situations where HTTP requests are initiated to remote servers through the file_get_contents function. However, sometimes we encounter a common error message: PHPWarning: file_get_c

In recent years, PHP has become one of the important tools for web development. However, PHP will also appear some error messages, one of the common errors is the "Invalidargumentsuppliedforforeach()" error. Here's how to fix this error. First, let’s understand what this error is. This error usually occurs when using foreach loop code, but providing invalid parameters to the loop code. In most cases, this error will crash the program

As a widely used programming language, PHP is widely used in many fields such as web development and server-side programming. During development, you may encounter the following error message: PHPWarning:strtolower()expectsparameter1tobestring. The solution to this problem lies in understanding the usage and parameters of the strtolower() function. First of all, strtolower() is a PHP built-in function used to convert

In today's era of web development, effective and efficient table management has become very important, especially when dealing with data-heavy web applications. The ability to dynamically add, edit, and delete rows from a table can significantly enhance the user experience and make applications more interactive. An effective way to achieve this is to leverage the power of jQuery. jQuery provides many features to help developers perform operations. Table rows A table row is a collection of interrelated data, represented by elements in HTML. It is used to group together cells (represented by elements) in a table. Each element is used to define a row in the table, and for multi-attribute tables, it usually contains one or more elements. Syntax$(selector).append(co

In PHP programming, Warning messages often appear. One of the more common prompts is "PHPWarning:implode():Invalidargumentspassed". This article will introduce the ideas and methods to solve this Warning. First, we need to understand how to use the implode() function. The function of this function is to concatenate an array into a string, using the following syntax: string

PHP is a commonly used server scripting language that can execute scripts on the web server to create dynamic web pages. The powerful functions and flexibility of PHP make it widely used in website development. The file_get_contents() function is also a commonly used method to obtain URL content in PHP. But sometimes you will encounter the following error: PHPWarning:file_get_contents(url):failedto
