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From: "J.O. Aho" <user@example.net>
Newsgroups: comp.lang.php
Subject: Re: strpos() before str_replace()? Or, maybe strtr()?
Date: Mon, 17 Feb 2014 06:35:38 +0100
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On 16/02/14 21:51, 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.
>
> Yes, though the question was rhetorical!

Even if your question is rhetorical:
One of the send guys did release an pdf some year ago where he wes 
recommending to strpos check before use of str_replace saying just that 
the strpos was more optimized.

-- 

  //Aho