PHP，GD库，图像旋转(PHP, GD library, Image rotation)

 感谢Yuriy的意见，我能够提出一个解决方案。 
 
 基本上，我创建的代码将在页面首次加载时定义我的函数。 此外，我注册了我的自定义函数，以在每次ajax请求后重新定义我的函数。 鉴于我将此代码放在MasterPage上，我能够使其在所有应用程序中运行。 
 
 这是代码： 
 
 MasterPage.aspx是一个简单的Html页面，其ContentPlaceHolders和ScriptManager位于表单标签的正下方。 另外，我必须在页面顶部（head标签）添加对“Utils.js”的引用。 
 
 MasterPage.aspx.cs 
 
protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        if (!Page.ClientScript.IsStartupScriptRegistered("jsDefineFunction"))
            Page.ClientScript.RegisterStartupScript(Page.GetType(), "jsDefineFunction", "defineValidationFunction();", true);

        if (!Page.ClientScript.IsStartupScriptRegistered("jsDefineEndRequestFunction"))
            Page.ClientScript.RegisterStartupScript(Page.GetType(), "jsDefineEndRequestFunction", "Sys.WebForms.PageRequestManager.getInstance().add_endRequest(defineValidationFunction);", true);
    }
}
 
 Utils.js 
 
function defineValidationFunction() {
    var ValidatorConvert = function (op, dataType, val) {
            //>>Consider everything as valid (client side)
            return op.toString();
        }
}
 
 有了这个，我的代码适用于使用MasterPage的所有页面。 代码将不断覆盖我的验证功能。 有一点开销，但我无法想出另一种方式。 

Thanks to Yuriy's input, I was able to come up with a solution.
 
Basically, I created code that will define my function when the page first load. Also, I registered my custom function to redefine my function after every ajax request. Given that I put this code on a MasterPage I'm able to make it work across all the application.
 
Here's the code:
 
MasterPage.aspx is a simple Html page with its ContentPlaceHolders and the ScriptManager right below the form tag. Also, I had to place a reference to my "Utils.js" at the top of the page (head tag).
 
MasterPage.aspx.cs
 
protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        if (!Page.ClientScript.IsStartupScriptRegistered("jsDefineFunction"))
            Page.ClientScript.RegisterStartupScript(Page.GetType(), "jsDefineFunction", "defineValidationFunction();", true);

        if (!Page.ClientScript.IsStartupScriptRegistered("jsDefineEndRequestFunction"))
            Page.ClientScript.RegisterStartupScript(Page.GetType(), "jsDefineEndRequestFunction", "Sys.WebForms.PageRequestManager.getInstance().add_endRequest(defineValidationFunction);", true);
    }
}
 
Utils.js
 
function defineValidationFunction() {
    var ValidatorConvert = function (op, dataType, val) {
            //>>Consider everything as valid (client side)
            return op.toString();
        }
}
 
With that in place, my code works for all pages that uses the MasterPage. The code will constantly overwrite the validation function with mine. There's a little bit of overhead but I couldn't figure out another way.