Change Header Redirect based on Error Conditions

[TryingToLearn]

Hello

When developing an application, exceptions (errors) can occur. I noticed that using the header( “Location” directToPage.php ), redirects to the page even if errors occur. I also noticed that it has to be the first line in the php code.

So I am curious, how do others use redirect logic when exceptions (errors) occur? For example:

<?php
	//-- I have to put the redirect here for it to work
	header( “Location” successPage.php );

	//-- I use a Data Access object to insert data but the insert fails
	//-- so instead of directing to successPage.php, I need to direct to errorPage.php
	$dao = new InsertDAO();
	If( $dao.insert() ) {
		//-- successful insert, let successPage.php redirect occur
	} else {
		//-- here is where the failed insert is caught… I now want to direct to
		//-- the errorPage.php but I am not sure how I can… this does not work
		header( “Location” errorPage.php );
	}

Any feedback is appreciated.

[Cups]

for one, your syntax is incorrect.
SB

header( "Location: errorPage.php" ) ;
exit();  // to be sure 

[AnthonySterling]

The location header call doesn't have to be first, it just has to be before any output. So feel free to process any amount of logic prior, just don't output anything.

[TryingToLearn]

Thank you very much for the clarification. Understanding that does allow logic to be applied then. Just to make sure I completely understand output… output is considered sending a response or flushing a stream but it is not considered writing to a file. Is this correct?

[AnthonySterling]

Correct.

[crmalibu]

btw, http://www.php.net/manual/en/book.outcontrol.php

Sometimes, it may be more convenient to let help with certain buffering tasks.

[TryingToLearn]

Thank you very much for the feedback.