Re: [PEPr] +1 for XML::XML_Feed_Parser

From:	Arnaud Limbourg	Date:	Fri, 21 Oct 2005 05:12:18 +0000
Subject:	Re: [PEPr] +1 for XML::XML_Feed_Parser
References:	1 2 3 4	Groups:	php.pear.dev
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Sean Coates wrote:

Sorry to jump in...
JP> I would prefer using ' for all strings except those with JP> backslash expressions as variable interpolation is more expensive JP> and less visible than concatenation.
Justin, are you sure? I always understood concatenation to be slower because memory had to be allocated separately for each string (prior to concatenation) whereas with interpolation, the memory is already allocated. Not trying to start a fight--I actually want to know your interpretation/proof. I remember seeing a comment from Ilia on a blog post about that. Ilia did several tests and the number of opcodes is smaller when doing concatenation.

I don't remember where and cannot find it on google doing a quick search. Alan pointed out the other day that auditing code which uses ' is easier because you know no variable substitution is going to occur so it is easier to read. Arnaud.