(3.0.7 - 3.0.18 only, PHP 4 >= 4.0.0)
function_exists -- Return TRUE if the given function has been defined
Description
bool function_exists (string function_name)
Checks the list of defined functions for function_name. Returns
TRUE if the given function name was found, FALSE otherwise.
if (function_exists('imap_open')) {
echo "IMAP functions are available.<br>\n";
} else {
echo "IMAP functions are not available.<br>\n";
}
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Note that a function name may exist, even if the function itself is unusable due to configuration
or compiling options.
See also method_exists().
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