我可以在变量中使用运算符吗

Question

我可以在 php 中编写如下代码吗？

$operator = ">=90";
$val = 100;
if($val.$operator){
echo "Correct!";
}

Answer 1

查看eval() function. Though, I would say you should look into closures and even arrow functions。

$operator = fn($x) => $x >= 90;
$val = 100;
if($operator($val)){
    echo "Correct!";
}