PHP cannot modify header information-headers already sent_php tutorial

This article describes a variety of PHP cannot modify header information-headers already sent by set solution, there is a need for some friends can refer to.

Set output_buffering to on in PHP config file php.ini. Open.

Output_buffering = On

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All or nothing, now or never.

The following workarounds are available:

1. Blank lines (empty line):
Make sure no blank line after the calling PHP script.
Check that there are no blank lines behind, especially the include or require files. Many problems are caused by these blank lines.

2. Use Exit statement (to be resolved with exit):

The code is as follows	Copy Code
Use exit after header statement seems to help some people Add exit () after the header; Header ("location:xxx"); Exit ();

Use JavaScript (to solve with JavaScript):

The code is as follows	Copy Code

Since it ' s a script, it won ' t modify the header until execution of Javascript.
You can use JavaScript instead of headers. But the above code I did not execute success ... It is also important to note that this approach requires JavaScript to be supported by the browser.

3b. Use output buffering (to be resolved with the export cache):

The code is as follows	Copy Code
... HTML codes ... ... PHP codes ... Header ("Location: ...."); Ob_end_flush (); ?>

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