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Message-ID: <2051024.CPFVgIA8O1@PointedEars.de>
From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Reply-To: Thomas 'PointedEars' Lahn <php@PointedEars.de>
Organization: PointedEars Software (PES)
Date: Sun, 16 Feb 2014 22:16:29 +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>
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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:
>>> <snip>
>>>>> I'm looping through roughly 100,000 values:
>>>>>
>>>>> $userArr = array(
>>>>>    "something" => "anything",
>>>>>    ...
>>>>> );
>>>>>
>>>>> foreach ($userArr as $key => $val) {
>>>>>    $firstname = str_replace($key, "****", $firstname);
>>>>>    $lastname = str_replace($key, "****", $lastname);
>>>>> }
>>>>>
>>>>> Both $firstname AND $lastname could contain any of the keys, but could
>>>>> only potentially contain one key each. It's likely, though, that
>>>>> neither will contain any of the keys.
>>> <snip>
>>>>> Would it be faster to use strpos() before each str_replace(), like
>>>>> so?:
>>>>>
>>>>> foreach ($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.
 
> Yes, though the question was rhetorical!

The question was stupid.


PointeDears
-- 
Sometimes, what you learn is wrong. If those wrong ideas are close to the 
root of the knowledge tree you build on a particular subject, pruning the 
bad branches can sometimes cause the whole tree to collapse.
  -- Mike Duffy in cljs, <news:Xns9FB6521286DB8invalidcom@94.75.214.39>