I need to change several variable values by rounding them, and while it works if I specify each variable individually I'm having trouble getting it to do the same thing in a function.   Single Variable  Result = 9.5 (Works correctly)  $var = 9.54; If ($var != NULL AND $var !== "") {    $var = round($var , 1, PHP_ROUND_HALF_EVEN);  } echo $var;   Function Result = 9.54 (Doesn't work correctly)  $a = 9.54; function RoundDecimal($var) {    If ($var != NULL AND $var !== "") {       $var = round($var , 1, PHP_ROUND_HALF_EVEN);     } } RoundDecimal($a); // Calls function echo $a;
Are PHP variables passed by value or by reference?
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