[翻译]压缩HTML输出为一行
（不知道有没有人发过，原文地址https://github.com/bcit-ci/CodeIgniter/wiki/Compress-HTML-output/）移除HTML代码中无用的空格（除js代码）
第一步：启用钩子 config/config.php
$config['enable_hooks'] = TRUE;
第二步：加入压缩的钩子 config/hooks.php
// Compress output
$hook['display_override'][] = array(
'class' => '',
'function' => 'compress',
'filename' => 'compress.php',
'filepath' => 'hooks'
);
第三步：定义一个“display_override”钩子
<?phpif ( ! defined('BASEPATH')) exit('No direct script access allowed');
function compress()
{
ini_set("pcre.recursion_limit", "16777");
$CI =& get_instance();
$buffer = $CI->output->get_output();
$re = '%# Collapse whitespace everywhere but in blacklisted elements.
(?> # Match all whitespans other than single space.
[^\S ]\s* # Either one [\t\r\n\f\v] and zero or more ws,
| \s{2,} # or two or more consecutive-any-whitespace.
) # Note: The remaining regex consumes no text at all...
(?= # Ensure we are not in a blacklist tag.
[^<]*+ # Either zero or more non-"<" {normal*}
(?: # Begin {(special normal*)*} construct
< # or a < starting a non-blacklist tag.
(?!/?(?:textarea|pre|script)\b)
[^<]*+ # more non-"<" {normal*}
)*+ # Finish "unrolling-the-loop"
(?: # Begin alternation group.
< # Either a blacklist start tag.
(?>textarea|pre|script)\b
| \z # or end of file.
) # End alternation group.
)# If we made it here, we are not in a blacklist tag.
%Six';
$new_buffer = preg_replace($re, " ", $buffer);
// We are going to check if processing has working
if ($new_buffer === null)
{
$new_buffer = $buffer;
}
$CI->output->set_output($new_buffer);
$CI->output->_display();
}
/* End of file compress.php */
/* Location: ./system/application/hooks/compress.php */
上面的代码保存在application/hooks/compress.php
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