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To allow javascript interaction you will most likely pass variables from javascript to a .php image (&lt;img src='./image.php?var1=1&amp;va<wbr />r2=2' style='...'/&gt;). <br />
<br />
You then use the image library, as above, with those variables to output the image. To change the background you'll need to change the background image for your site. <br />
<br />
IF YOU ARE ALLOWING USER INPUT TO INFLUENCE YOUR PHP SCRIPTS, make sure to validate and sanitize any and all accepted inputs before using them. 
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To allow javascript interaction you will most likely pass variables from javascript to a .php image (<img src='./image.php?var1=1&var2=2' style='...'/>).

You then use the image library, as above, with those variables to output the image. To change the background you'll need to change the background image for your site.

IF YOU ARE ALLOWING USER INPUT TO INFLUENCE YOUR PHP SCRIPTS, make sure to validate and sanitize any and all accepted inputs before using them.

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Thanks for both of your help... is there anyway to create gradients??
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Thanks for both of your help... is there anyway to create gradients??

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HEROIC!!! Many thanks to you both!!!!
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Hi Experts,<br />
<br />
Looking at this site:<br />
<br />
<a href="http://www.stripegenerator.com/" rel="ugc">http://www.stripegenerator.com/</a><br />
<br />
is there any way to generate or manipulate colours in an image... So users can change the colour of stripes or gradients on my site?
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Hi Experts,

Looking at this site:

http://www.stripegenerator.com/

is there any way to generate or manipulate colours in an image... So users can change the colour of stripes or gradients on my site?

image manipulation with php and javascript

PHP is a widely-used server-side scripting language especially suited for web development, powering tens of millions of sites from Facebook to personal WordPress blogs. PHP is often paired with the MySQL relational database, but includes support for most other mainstream databases. By utilizing different Server APIs, PHP can work on many different web servers as a server-side scripting language.

JavaScript is a dynamic, object-based language commonly used for client-side scripting in web browsers. Recently, server side JavaScript frameworks have also emerged. JavaScript runs on nearly every operating system and  in almost every mainstream web browser.

JavaScript

Web development can range from developing the simplest static single page of plain text to the most complex web-based internet applications, electronic businesses, and social network services using a wide variety of languages and standards, including the familiar HTML, JavaScript and jQuery, ASP and ASP.NET, PHP, ColdFusion, CSS, PHP, Flex and Flash, but also the implementation of a broad list of standards including XML, WSDL, SSDL, VoiceXML and many more.