$hour > 11 ? ($xm = 'pm') : $xm = 'am';
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To make this a little clearer, this is the same as:

if(  $hour > 11  ) {
    ( $xm= 'pm' )= 'am';
} else {
    $xm= 'am';
}
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So $xm is always set to 'am'.

        - tye (but my friends call me "Tye")