删除html内容中textarea标记内的前面的空格

Question

For my Zend Framework library i have this view-helper that indents code.

I have added the solution in the code below

<?php

class My_View_Helper_Indent
{

    function indent($indent, $string, $space = ' ')
    {
        if($string == '') {
            return '';
        }
        $indent = str_repeat($space, $indent);
        $content = $indent . str_replace("
", "
" . $indent, rtrim($string)) . PHP_EOL;           

// BEGIN SOLUTION TO PROBLEM
// Based on user CodeAngry's answer
$callback = function($matches) use ($indent) {
    $matches[2] = str_replace("
" . $indent, "
", $matches[2]);
    return '<textarea' . $matches[1] . '>' . $matches[2] . '</textarea>';
};
$content = preg_replace_callback('~<textarea(.*?)>(.*?)</textarea>~si', $callback, $content);       
// END 

        return $content;
    }
}

And with the following test code..

$content = 'This is some text' . PHP_EOL;
$content .= '<div>' . PHP_EOL;
$content .= '  Text inside div, indented' . PHP_EOL;
$content .= '</div>' . PHP_EOL;
$content .= '<form>' . PHP_EOL;
$content .= '  <ul>' . PHP_EOL;
$content .= '    <li>' . PHP_EOL;
$content .= '      <label>inputfield</label>' . PHP_EOL;
$content .= '      <input type="text" />' . PHP_EOL;
$content .= '    </li>' . PHP_EOL;
$content .= '    <li>' . PHP_EOL;
$content .= '      <textarea cols="80" rows="10">' . PHP_EOL;
$content .= 'content of text area' . PHP_EOL;
$content .= '   this line is intentionally indented with 3 whitespaces' . PHP_EOL;
$content .= 'content of text area' . PHP_EOL;
$content .= '      </textarea>' . PHP_EOL;
$content .= '    </li>' . PHP_EOL;
$content .= '  </ul>' . PHP_EOL;
$content .= '</form>' . PHP_EOL;
$content .= 'The end';

echo $this->view->indent (6, $content);

What i would like to do, is to remove X whitespace characters from lines with the textarea tags. Where X matches the number of spaces that the code was indented, in the example above it's 6 spaces.

Answer 1

$html = preg_replace('~<textarea(.*?)>\s*(.*?)\s*</textarea>~si',
    '<textarea$1>$2</textarea>', $html);

Try this regular expression. Should trim the contents of your textarea contents. Is this what you need?

OR:

$html = preg_replace_callback('~<textarea(.*?)>(.*?)</textarea>~si', function($matches){
    $matches[2] = trim($matches[2]); // trim 2nd capture (inner textarea)
    return "<textarea{$matches[1]}>{$matches[2]}</textarea>";
}, $html);