The access function iif is very easy to check an expression and return a different value wether the expression is true or false.
functionÂÂiif($expression,ÂÂ$returntrue,ÂÂ$returnfalseÂÂ=”) {
    return ($expressionÂÂ?ÂÂ$returntrueÂÂ:ÂÂ$returnfalse);
}
?>
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