| Re: strpos() before str_replace()? Or, maybe strtr()? [message #184929 is a reply to message #184928] |
Sun, 16 February 2014 20:41   |
J.O. Aho
Messages: 194
Registered: September 2010
Karma:
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Senior Member |
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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.
--
//Aho
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