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That indeed correct. A check

Submitted by Dominique De Cooman on Tue, 2010-09-21 13:06.

That indeed correct. A check should be performed. Above function should be.

<?php

/**
 * Themes an image from text
 */
function theme_your_module_formatter_text_as_image($element) {
  //Validation
  $string_to_obscure = $element[0]['#item']['safe'];
  if (!$string_to_obscure) {
    return;
  }

  // Set up signwriter profile    
  $profile->fontfile = drupal_get_path('module', 'signwriter'). '/Arial.TTF';//See this issue why its like this (<a href="http://drupal.org/node/606670" title="http://drupal.org/node/606670">http://drupal.org/node/606670</a>)
  $profile->fontsize = 10;
  $profile->foreground = '000000';
  $profile->background = 'ffffff';
  $profile->maxwidth = 600;
  $profile->transparent = true;
  $profile->imagetype = 'png';
  $profile->disable_span = true; 
    
  $text= signwriter_title_convert($string_to_obscure, $profile);
  //Some extra logic if it is an email    
  $output = preg_replace('/alt="[0-9a-zA-Z!@#\$%^&\*~\-\.\+\_\/=\?\|\{\}}]+"/','alt="Email Address"',$text);
    
  return $output;
}
?>

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