php回调函数

php回调函数

//回调函数 function getSum($a,$b,$c){ return $c($a,$b,$c); //sub(1,2) } function sum($num1,$num2){ return $num1+$num2; } function sub($num1,$num2){ return $num1-$num2 } $ers = getSum(3,4,'sub'); echo $res;