Which function is faster? substr() or str_replace()? [closed]

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I have a script where开发者_StackOverflow中文版 I can use either substr() or str_replace(). With substr() I just have to cut off the last character and with str_replace I need to replace ! with nothing. Which one would be faster?

I guess substr()?

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I'm not familiar with the PHP source code, but I assume definitely substr(), as it can jump directly to the defined offset.

Don't forget though that this will make a difference only with lots of data. For smaller strings, it is preferable to choose whatever makes for more readable code.