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Message-ID: <32394685.JNGdiLLVUf@PointedEars.de>
From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Reply-To: Thomas 'PointedEars' Lahn <php@PointedEars.de>
Organization: PointedEars Software (PES)
Date: Tue, 18 Feb 2014 01:33:18 +0100
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Subject: Re: strpos() before str_replace()? Or, maybe strtr()?
Newsgroups: comp.lang.php
References: <cd42c387-7d7c-43de-bb0f-e12134d6ece2@googlegroups.com> <1816957.0LDT0NebiR@PointedEars.de> <0.9da5fd4e321b89e9adc3.20140216202439GMT.877g8u7qm0.fsf@bsb.me.uk> <bmcm4cFarddU1@mid.individual.net> <0.1d3b7c8128d5ae4333af.20140216205119GMT.87siri6at4.fsf@bsb.me.uk> <2051024.CPFVgIA8O1@PointedEars.de> <0.72f969f4ca3b7fcb1715.20140216231324GMT.87ha7y648b.fsf@bsb.me.uk>
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Ben Bacarisse wrote:

> Thomas 'PointedEars' Lahn <PointedEars@web.de> writes:
>> Ben Bacarisse wrote:
>>> "J.O. Aho" <user@example.net> writes:
>>>> On 16/02/14 21:24, Ben Bacarisse wrote:
>>>>> Thomas 'PointedEars' Lahn <PointedEars@web.de> writes:
>>>>>> Jason C wrote:
>>>>>>> Would it be faster to use strpos() before each str_replace(), like
>>>>>>> so?:
>>>>>>>
>>>>>>> foreach ($userArr as $key => $val) {
>>>>>>>    if (strpos($firstname, $key) !== false)
>>>>>>>      $firstname = str_replace($key, "****", $firstname);
>>>>>>>
>>>>>>>    if (strpos($lastname, $key) !== false)
>>>>>>>      $lastname = str_replace($key, "****", $lastname);
>>>>>>> }
>>>>>>
>>>>>> Most certainly not.
>>>>>
>>>>> And yet, when I measured it, it was faster.  How can that be?
>>>>>
>>>>> <snip>
>>>>
>>>> For strpos is faster than str_replace on finding the string.
>>
>> How, and why?  Both search for the occurrence of a substring in a
>> string.
> 
> Because strpos has a lower per-call overhead.

That is irrelevant regarding the question which function can *find* the 
string faster, is it not?


PointedEars
-- 
Danny Goodman's books are out of date and teach practices that are
positively harmful for cross-browser scripting.
  -- Richard Cornford, cljs, <cife6q$253$1$8300dec7@news.demon.co.uk> (2004)