ascii 控制符替换

0.readme.md

（检查 rss 中的特殊字符） http://www.pengzao.com/article/html-entity.html

http://zh.wikipedia.org/wiki/%E6%8E%A7%E5%88%B6%E5%AD%97%E7%AC%A6

    function HtmltoEntity(str){
        var match = [
            '<',
            '>',
            '"',
            "'"
        ];
        var replace = [
            '&lt;',
            '&gt;',
            '&quot;',
            '&#039;'
        ];
        str = str.split("&");
        str = str.join("&amp;");
        for(var i=0;i<match.length;i++){
            var ms = eval("/"+match[i]+"/g");
            str = str.replace(ms, replace[i]);
        }
        return str;
    }

1.php

<?php
    $content = preg_replace(
        array(
            '/\x00/', '/\x01/', '/\x02/', '/\x03/', '/\x04/',
            '/\x05/', '/\x06/', '/\x07/', '/\x08/', '/\x09/', '/\x0A/',
            '/\x0B/','/\x0C/','/\x0D/', '/\x0E/', '/\x0F/', '/\x10/', '/\x11/',
            '/\x12/','/\x13/','/\x14/','/\x15/', '/\x16/', '/\x17/', '/\x18/',
            '/\x19/','/\x1A/','/\x1B/','/\x1C/','/\x1D/', '/\x1E/', '/\x1F/'
        ),
        array(
            "\u0000", "\u0001", "\u0002", "\u0003", "\u0004",
            "\u0005", "\u0006", "\u0007", "\u0008", "\u0009", "\u000A",
            "\u000B", "\u000C", "\u000D", "\u000E", "\u000F", "\u0010", "\u0011",
            "\u0012", "\u0013", "\u0014", "\u0015", "\u0016", "\u0017", "\u0018",
            "\u0019", "\u001A", "\u001B", "\u001C", "\u001D", "\u001E", "\u001F"
        ),
        $content
    );