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Re: split array and string from string (trust me it will make sense when you read) [message #180814 is a reply to message #180813] Wed, 20 March 2013 01:21 Go to previous messageGo to previous message
Christoph Becker is currently offline  Christoph Becker
Messages: 91
Registered: June 2012
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CloudPress wrote:

> I guess the real question is is there anything to be gained by using
> regular expressions. besides cleaner code? Because if this will work
> without any noticeable performance difference compared to regex it might
> just be easier to stick to this.

IMO it's not so much about cleaner code, than about performance. Using
regexp's will shift all the hard work from PHP to C, which is much
faster. Consider the code you've posted: it calls strpos(), substr(),
str_replace() et al. in a loop multiple times; for sure not the fastest
way of doing things.

A quick example, what can be accomplished with a simple regexp:

>>> $str = 'Hello world, [key=value] [key2=value1] This is just a
test. [key=value2]';
>>> echo preg_replace('/\[key[0-9]*=value[0-9]*\]/', '', $str);
Hello world, This is just a test.

To fill the array of key/value pairs, you can start with:

>>> preg_match_all('/\[(key[0-9]*)=(value[0-9]*)\]/', $str, $m);
>>> var_dump($m)

--
Christoph M. Becker
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