­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ $var; /* testBooleanNot */ $a = ! $var; /* testComma */ echo $a, $b, $c; /* testAsperand */ $a = @callMe(); /* testDollarAndCurlies */ echo ${$var}; /* testBacktick */ $a = `ls -e`;