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Warning: Cannot modify header information - headers already sent by (output started at C:\www\hosting\plans.php:5) in C:\www\hosting\step_one.php on line 107
Well if you view the PHP Manual you will see a paragraph saying:
Remember that header() must be called before any actual output is sent, either by normal HTML tags, blank lines in a file, or from PHP. It is a very common error to read code with include(), or require(), functions, or another file access function, and have spaces or empty lines that are output before header() is called. The same problem exists when using a single PHP/HTML file.