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@ 2015-06-10T19:36:59Z

<?php
class test {
	function register() {
		if (!function_exists('test_init')) {
			function test_init() {
				echo 'Initializing library'.PHP_EOL;
			}
		}
	}
}

$test = new test;
$test->register();
test_init();
?>

Output
Performance
VLD
References
Branches

function_exists: documentation ( source)

preferences:dark modelive previewkey bindings

119.18 ms | 2141 KiB | 5 Q