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Get a List of All Available PHP Functions

This one's actually pretty easy. Just create a new page on your web site with the following code inside it -- when you visit said page, you'll see a (fairly long) list of the PHP functions available to you. What's more is that each function on the list will appear as a link to the function's description and parameters (as found on PHP.net). Here's the code:

<?php
$defined_functions = get_defined_functions();
$defined_int_funcs = $defined_functions["internal"];
natsort($defined_int_funcs);
print '<div style="font-family: Courier New;">';
	foreach ($defined_int_funcs as $sortk => $sortv) {
		$formatted = str_replace('_','-',$sortv);
		$function_link = '<a style="text-decoration: none;" href=';
		$function_link .= '"http://www.php.net/manual/en/function.';
		$function_link .= $formatted;
		$function_link .= '.php" target="_blank">';
		$function_link .= $sortv;
		$function_link .= "()</a><br/>\n";
		print $function_link;
	}
print '</div>';
?>

OR, you can check out this page.