Gravatar Avatar cache of typecho

Recently, I used typecho to build a website, but gravatar's profile picture was walled. I searched for wordpress on Baidu. I just used plug-ins to modify the source file, but could I use the wordpress function. the php method uses typecho and the function on wordpress. php write down... recently, I used typecho to build a website, but gravatar's profile picture was walled. I searched for wordpress on Baidu. I just used plug-ins to modify the source file, but could I use the wordpress function. the php method uses typecho and the function on wordpress. php writes the following functions to go to the multi-statement source, but the function of typecho. how should I write php? Can it be implemented?
Function mytheme_get_avatar ($ avatar ){
$ Avatar = preg_replace ("/http: \/(www | \ d) .gravatar.com/", "http://gravatar.duoshuo.com", $ avatar );
Return $ avatar;
}
Add_filter ('get _ avatar ', 'mytheme _ get_avatar ');

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Recently, I used typecho to build a website, but gravatar's profile picture was walled. I searched for wordpress on Baidu. I just used plug-ins to modify the source file, but could I use the wordpress function. the php method uses typecho and the function on wordpress. php writes the following functions to go to the multi-statement source, but the function of typecho. how should I write php? Can it be implemented?
Function mytheme_get_avatar ($ avatar ){
$ Avatar = preg_replace ("/http: \/(www | \ d) .gravatar.com/", "http://gravatar.duoshuo.com", $ avatar );
Return $ avatar;
}
Add_filter ('get _ avatar ', 'mytheme _ get_avatar ');

Typecho Gravatar address modification plug-in, Avatar Acceleration