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When debugging it is often useful to have a way to output data in a human readable format.

Perl[]

use Data::Dumper; print Dumper($foo);

PHP[]

In var_export(), the 2nd argument sets whether to return the result instead of printing it

print var_export($foo, true);

You can also trigger a notice, so it'll show up in your logging, instead of on the generated page (NB: trigger_error() truncates the message to 1024 bytes if it's larger than that):

trigger_error(var_export($foo, true), E_USER_NOTICE);
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