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I am using wordpress total cache, and i need to clear cache every time a comment is added or modified

<?php 
 $w3_plugin_totalcache->flush_all();
?>

i found this method but , i don't know when to call it ( how to get when a comment is posted/updated )

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You would better to contact plugin author, because this is for more general wordpress stuff.

In general, you can clear your cache when comment is added.

There is comment_post hook. This hook will be run when the comment is submitted. To see Reference

  • where can i find the comment_post hook ? is it in theme's function file ? – AYMEN SOUMER Sep 10 '19 at 14:03
  • It's wp-core filter. You can use the hook in functions.php in your theme. – idpokute Sep 10 '19 at 14:15

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