为了平等，我如何比较PHP中的两个HTML / JavaScript字符串？

I have a PHP program that stores the HTML/JavaScript contents of a webpage in a mySQL database. The contents are obtained using cURL, and are then subjected to $mysqli->real_escape_string() before being stored in the table as a longtext.

我有一个PHP程序,它将网页的HTML / JavaScript内容存储在mySQL数据库中。内容是使用cURL获得的,然后在作为longtext存储在表中之前经过$ mysqli-> real_escape_string()。

Later, I have to once again use cURL to get the HTML/JavaScript contents of the webpage and retrieve those which I stored in the database.

稍后,我必须再次使用cURL来获取网页的HTML / JavaScript内容并检索我存储在数据库中的内容。

At this point, I need to compare them to see whether changes have been made or not in the code. I've tried using:

此时,我需要比较它们以查看代码中是否进行了更改。我尝试过使用:

if ($saved == $content)
   return true;
else
   return false;

however this always returns false, even when no changes have been made to the code. Upon using cURL the second time, I am not escaping the string, so that isn't the issue. I've compared the two pieces of code, but I can't visually discern any differences. How can I compare the two strings so that it will accurately return whether any change has been made or not? I should also mention that both files execute just fine, except that the second one always returns false.

但是,即使没有对代码进行任何更改,它也始终返回false。在第二次使用cURL时,我没有转义字符串,所以这不是问题。我比较了两段代码,但我无法直观地辨别出任何差异。如何比较两个字符串,以便准确返回是否进行了任何更改?我还应该提到两个文件都执行得很好,除了第二个文件总是返回false。

First PHP file:

第一个PHP文件:

$url = "www.example.com";
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$content = $mysqli->real_escape_string(curl_exec($ch));
curl_close($ch);

$query = "INSERT INTO saved (url, content)
              VALUES ('$url', '$content')";

$mysqli->query($query)

Second PHP file:

第二个PHP文件:

    $url = "www.google.com";
    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    $content = curl_exec($ch);
    curl_close($ch);

    $query = "SELECT content
              FROM saved
              WHERE url = '$url'";

    $result = $mysqli->query($query);
    $data = $result->fetch_assoc();
    $saved = $data['content'];

    if ($saved == $content)
        echo '1';
    else
        echo '0';

2 个解决方案

#1

md5 the contents and save it. Now just check the fingerprints

md5内容并保存。现在只需检查指纹

if($saved['fingerprint'] == $content['fingerprint'])

#2

If you just need to compare content, my suggestion would be to create a checksum of the data (using md5 or similar) and compare the data based on the checksum.

如果您只需要比较内容,我的建议是创建数据校验和(使用md5或类似)并根据校验和比较数据。

#1