Try this errorTesting.php file which may help you understand why the errors are not showing:
file: errorTesting.php
<?php
ini_set('display_errors',0);
$errorLogFileNEW = 'errorLogFileNEW.php';
echo '<br />' .__LINE__ .' : OLD: ' .ini_set('error_log', $errorLogFileNEW);
echo '<br />' .__LINE__ .' : NEW: ' .ini_get('error_log');
echo '<br />' .__LINE__ .' : Before $forceError/0 <br />';
highlight_file($errorLogFileNEW);
echo '<br />'.__LINE__ .$forceError/0;
echo '<br />' .__LINE__ .' : After $forceError/0 <br />';
highlight_file($errorLogFileNEW);
echo '<br />' .__LINE__ .' Show Errors - ini_set("display_errors",1);';
ini_set('display_errors',1);
echo '<br />' .__LINE__ .' : After: <br />';
echo $i2/0;
echo '<br />' .__LINE__ .' - filesize($errorLogFileNEW) = ' .filesize($errorLogFileNEW);
highlight_file($errorLogFileNEW);
$deleteErrorLog = 10;
if( $deleteErrorLog && file_exists($errorLogFileNEW) ):
$ok = unlink($errorLogFileNEW);
if($ok):
#echo '<br />' .__LINE__ .' Just deleted: ' .$errorLogFileNEW;
endif;
endif;
?>