[TYPO3] Building a hook

[tapio]

> Look at the hooks in t3lib_tcemain ... they always do something like:
> 
> $_procObj->postProcessData(...)

the first is just

$hookObjectsArr = array();
		if (is_array 
($TYPO3_CONF_VARS['SC_OPTIONS']['t3lib/class.t3lib_tcemain.php']['processDatamapClass'])) 
{
			foreach 
($TYPO3_CONF_VARS['SC_OPTIONS']['t3lib/class.t3lib_tcemain.php']['processDatamapClass'] 
as $classRef) {
				$hookObjectsArr[] = &t3lib_div::getUserObj($classRef);
			}
		}


If I put with exactly the similar syntax:
											$_procObj = array();
										 
if(is_array($TYPO3_CONF_VARS['EXTCONF']['tm_contentaccess']['hasAccess'])) 
    {
												foreach 
($TYPO3_CONF_VARS['EXTCONF']['tm_contentaccess']['hasAccess'] as 
$hasAccessControl) {
													 $_procObj[] = &t3lib_div::getUserObj($hasAccessControl);
												}

could a hook return a boolean value for a variable

The difference for the previous version is $_procObj[] instead of $_procObj