How to surround all text snippets with paragraph tags?

Question

I want to put paragraph tags around any text elements. Therefore, he should avoid tables and other elements. How should I do it? I think it can somehow be done with preg_replace?

Answer 1

Here are a few features to help you do what you want to do:

// nl2p
// This function will convert newlines to HTML paragraphs
// without paying attention to HTML tags. Feed it a raw string and it will
// simply return that string sectioned into HTML paragraphs

function nl2p($str) {
    $arr=explode("\n",$str);
    $out='';

    for($i=0;$i<count($arr);$i++) {
        if(strlen(trim($arr[$i]))>0)
            $out.='<p>'.trim($arr[$i]).'</p>';
    }
    return $out;
}



// nl2p_html
// This function will add paragraph tags around textual content of an HTML file, leaving
// the HTML itself intact
// This function assumes that the HTML syntax is correct and that the '<' and '>' characters
// are not used in any of the values for any tag attributes. If these assumptions are not met,
// mass paragraph chaos may ensue. Be safe.

function nl2p_html($str) {

    // If we find the end of an HTML header, assume that this is part of a standard HTML file. Cut off everything including the
    // end of the head and save it in our output string, then trim the head off of the input. This is mostly because we don't
    // want to surrount anything like the HTML title tag or any style or script code in paragraph tags. 
    if(strpos($str,'</head>')!==false) {
        $out=substr($str,0,strpos($str,'</head>')+7);
        $str=substr($str,strpos($str,'</head>')+7);
    }

    // First, we explode the input string based on wherever we find HTML tags, which start with '<'
    $arr=explode('<',$str);

    // Next, we loop through the array that is broken into HTML tags and look for textual content, or
    // anything after the >
    for($i=0;$i<count($arr);$i++) {
        if(strlen(trim($arr[$i]))>0) {
            // Add the '<' back on since it became collateral damage in our explosion as well as the rest of the tag
            $html='<'.substr($arr[$i],0,strpos($arr[$i],'>')+1);

            // Take the portion of the string after the end of the tag and explode that by newline. Since this is after
            // the end of the HTML tag, this must be textual content.
            $sub_arr=explode("\n",substr($arr[$i],strpos($arr[$i],'>')+1));

            // Initialize the output string for this next loop
            $paragraph_text='';

            // Loop through this new array and add paragraph tags (<p>...</p>) around any element that isn't empty
            for($j=0;$j<count($sub_arr);$j++) {
                if(strlen(trim($sub_arr[$j]))>0)
                    $paragraph_text.='<p>'.trim($sub_arr[$j]).'</p>';
            }

            // Put the text back onto the end of the HTML tag and put it in our output string
            $out.=$html.$paragraph_text;
        }

    }

    // Throw it back into our program
    return $out;
}

The first one, nl2p (), takes a string as input and converts it to an array wherever there is a newline character ( "\n"). Then it goes through each element, and if it finds one that is not empty, it will wrap tags <p></p>around it and add it to the line that returns at the end of the function.

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