php - Change Variable Values by Form -

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How can any PHP variables change PHP variables? I am using PHP scripts to display values ​​on HTML pages

but I do not want to edit

values ​​by editing the PHP files but I do not know how to do this

Here my PHP scripts [data.php] 

  < Php $ web_title_en = "JDST blog"; // website title $ web_subtitle_en = "blah blah blah"; // website subtitles? & Gt;

and html (to display values) [index.html] 

  & lt; Html & gt; & Lt; Top & gt; & Lt ;? Php included 'data.php';; & Gt; & Lt; / Head & gt; & Lt; Body & gt; & Lt; H1 & gt; & Lt ;? Php echo $ web_title_en; ? & Gt; & Lt; / H1> & Lt; H4 & gt; & Lt ;? Php echo $ web_subtitle_en; ? & Gt; & Lt; / H4 & gt; & Lt; / Body & gt; & Lt; / Html & gt; If you want to process html form with php, you should read it. Your form will look something like this:  
  & lt; Html & gt; & Lt; Body & gt; & Lt; Form action = "data.php" method = "post" & gt; Title: & lt; Input type = "text" name = "title" & gt; & Lt; Br> Subtitles: & lt; Input type = "text" name = "subtitle" & gt; & Lt; Br> & Lt; Input type = "submit" & gt; & Lt; / Form & gt; & Lt; / Body & gt; & Lt; / Html & gt;  
 
 And this will be data.php (a merged version with your index.html) 
 
   & Lt; H4 & gt; & Lt ;? Php echo $ web_subtitle_en; ? & Gt; & Lt; / H4 & gt; & Lt; / Body & gt; & Lt; / Html & gt;

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