How do I know if my php version has function X ?

[davebartlett]

I want to use "xdiff_string_patch" but the manual entry doesn't say what version of php this requires.

http://uk.php.net/manual/en/function.xdiff-string-patch.php

How can I ask my php installation if it has "xdiff_string_patch"?

[jazz_snob]

Try function_exists()

[Megahertza]

I suppose, if you try and use it php will either do it or output a error

[Davy]

Out of curiosity, what is this function?

I have gone to the php.net site via the link you provided but I cannot make sesne of it.

It performs patches to text and html files...ayy?

What is a practical use for these 'xdiff' functions?

[Ceril]

no version information, might be only in CVS, kk?
Greatest chance to get it: PHP5 I would say 🙂