php中preg_replace怎样改为preg_replace_callback（源码如下）

[qq_33340722]

$source_content = preg_replace($search.'e', "'"
. $this->_quote_replace($this->left_delimiter) . 'php'
. "' . str_repeat(\"\n\", substr_count('\\0', \"\n\")) .'"
. $this->_quote_replace($this->right_delimiter)
. "'"
, $source_content);

/* Gather all template tags. */
preg_match_all("~{$ldq}\s*(.*?)\s*{$rdq}~s", $source_content, $_match);
$template_tags = $_match[1];
/* Split content by template tags to obtain non-template content. */
$text_blocks = preg_split("~{$ldq}.*?{$rdq}~s", $source_content);