Adding the following code to the top of your PHP script will allow that page to show PHP error messages and override the php.ini defaults. This is a good and simple way to quickly debug a page without having to adjust your main PHP config (which isn’t always possible).
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JavaScript is a powerful tool for a website but to extend the capabilities and functionality extra libraries can be included, the most commonly used libraries are jQuery and Prototype. Normally a website will choose either of these libraries but sometimes both libraries are required, if this is the case a small change needs to be
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