php comparison operators

This article introduces the comparison operators in PHP, which has certain reference value. Now I share it with you. Friends in need can refer to it

1. If you compare a number and a string Or comparing strings involving numeric content, the strings will be converted into numerical values ​​and the comparison will be performed according to the numerical values ​​

2,

switch ("a") {
case 0:
    echo "0";//会运行到这里了因为"a"和数字0比较，字符串被转换成0。如果case “a”放在第一个，那么会运行到case "a"的程序
    break;
case "a": // never reached because "a" is already matched with 0
    echo "a";
    break;
}

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