| Re: strpos() before str_replace()? Or, maybe strtr()? [message #184933 is a reply to message #184931] |
Sun, 16 February 2014 21:16   |
Thomas 'PointedEars'
Messages: 701
Registered: October 2010
Karma:
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Senior Member |
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Ben Bacarisse wrote:
> "J.O. Aho" <user(at)example(dot)net> writes:
>> On 16/02/14 21:24, Ben Bacarisse wrote:
>>> Thomas 'PointedEars' Lahn <PointedEars(at)web(dot)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(at)94(dot)75(dot)214(dot)39>
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