How to print a debug log?

php debugging logging
eugene picture eugene · May 21, 2011 · Viewed 252.4k times · Source

I'd like to debug some PHP code, but I guess printing a log to screen or file is fine for me.

How should I print a log in PHP code?

The usual print/printf seems to go to HTML output not the console.

I have Apache server executing the PHP code.

Answer

chx picture chx · May 21, 2011

A lesser known trick is that mod_php maps stderr to the Apache log. And, there is a stream for that, so file_put_contents('php://stderr', print_r($foo, TRUE)) will nicely dump the value of $foo into the Apache error log.

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