Wordpress: Function to add images in text editor -

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I'm really new to Wordpress and gradually getting my head around it, but I have come into a problem and I do not know how to fix it.

I am creating a page using text editor in backend and I paste the html there. All are working fine and I can output images to functions.php using this function (I've got this snippet anywhere but I do not remember) 

  // Create shortcode template_url ($ atts, $ content = null) {return '& lt; Img src = "'. Get_template_directory_uri ().' / '. $ Content.'" Alt = "" /> gt; '; } // Add as shortcode code add_shortcode ("template", "template_url");   
 And I call it like this  
  [template] picture / my-image.jpg [/ template]   
 The problem is how do I add some alt text and add a class for the image   
 
 < p> You can add  shortcode  with your  custom attributes  like this: -  
 Add the following code to add the shortcode:  < Pre>  function template_url ($ atts, $ content = null) {extract (shortcode_ts (array ('alt' => gt; '', 'width' = & gt; '', 'heig Ht '= & gt;' '), $ atts)); // And you can use this variable in this way: - Return '& lt; img src = "'. get_template_directory_uri ().' / '. $ contents.'" alt = "'. alt alt."' width = "'. $ Width '"Height ="' $ Height Use this shortcode in the add_shortcode ("template", "template_url");   
 and in the editor: -  
  [ Template alt = "this change is text" width = "400" height = "300"] image / my image .jpg [/ template]   
 I hope this will be useful.

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