How to check GD library support in PHP

This is a way of figuring out wether of not you have GD installed and functioning on your web server.

When GD is available, you have access to a set of functions. The basic idea is to create a function that checks if those functions exist, by verifying the function gd_info that returns an array of supported or unsupported features.

The following code check if gd_info exists, then outputs each of its elements with its value. (YES if it's supported, NO is it's not supported)

<?php

function gdInfo()
{
	// Check if the function gd_info exists (great way to know if gd is istalled)
	if (function_exists("gd_info"))
	{
		echo "GD is supported. Here are some details:<br>";
		$gd = gd_info();

		// Show status of all values that might be supported(unsupported)
		foreach ($gd as $key => $value)
		{
			echo " " . $key . ": ";
			if ($value)
				echo "YES<br>";
			else
				echo "NO< br>";
		}
	}
	else
		echo "GD is not supported";
}

?>

Paste the code into your script and call the function to check if your php version supports GD.