Altering file name with php -

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i'm getting info out of rss feed.

how can change file name php?

say have filename:

http://anyurl.com/any_file_name_200.jpg

i need change last part of "200.jp" number, "800.jpg". need dynamically, because "any_file_name" different, file names have same structure in end "123.jpg"

any ideas?

you can use preg_replace:

$filename = 'any_file_name_200.jpg'; $newfilename = preg_replace('/\d{3}\.jpg/','800.jpg',$filename);

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