How to write php pop-up error warning function with strong expansibility

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The copy code is as follows:

/ / * pop up the alert box and jump to the specified page * / /

Function alert ($message,$url='',$isAlert=true,$title=' prompt') {

Echo', $title,''

Echo''

Echo $isAlert?'alert ("'.$ message.'");':'

Echo $url==''?'history.back ();': 'location.href= "'. $url.'";'

Echo''

Echo''

Exit ()

}

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