无效的HTML-引用属性

Question

I have following HTML:

<td width=140 style='width:105.0pt;padding:0cm 0cm 0cm 0cm'>
    <p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";
       mso-fareast-font-family:"Times New Roman";color:#666666'>OCCUPANCY
       TAX:</span></p>
</td>

Some of the HTML attributes are not quoted, like for example: width=140 and class=MsoNormal

Are there any PHP function for that sort of thing, if not what would be the clever way of sanitizing this in HTML?

Thank you.

Answer 1

I guess you could use regexp for this:

/\s([\w]{1,}=)((?!")[\w]{1,}(?!"))/g


\s match any white space character [\r\n\t\f ]
1st Capturing group ([\w]{1,}=)
    [\w]{1,} match a single character present in the list below
        Quantifier: {1,} Between 1 and unlimited times, as many times as possible, giving back as needed [greedy]
    \w match any word character [a-zA-Z0-9_]
    = matches the character = literally
2nd Capturing group ((?!")[\w]{1,}(?!"))
    (?!") Negative Lookahead - Assert that it is impossible to match the regex below
    " matches the characters " literally
    [\w]{1,} match a single character present in the list below
        Quantifier: {1,} Between 1 and unlimited times, as many times as possible, giving back as needed [greedy]
    \w match any word character [a-zA-Z0-9_]
    (?!") Negative Lookahead - Assert that it is impossible to match the regex below
    " matches the characters " literally
g modifier: global. All matches (don't return on first match)

Which would be implemented something like this:

echo preg_replace_callback('/\s([\w]{1,}=)((?!")[\w]{1,}(?!"))/', function($matches){
    return ' '.$matches[1].'"'.$matches[2].'"';
}, $str);

And would result in:

 <td width="140" style='width:105.0pt;padding:0cm 0cm 0cm 0cm'>
   <p class="MsoNormal"><span style='font-size:9.0pt;font-family:"Arial","sans-serif";
     mso-fareast-font-family:"Times New Roman";color:#666666'>OCCUPANCY
      TAX:</span></p>
 </td>

Eval.in live example

Note, this is a down and dirty example, and can surely be cleaned up.