php运算符

<?php

/*运算符*/
    /*1. 基本运算符 + - * / %
    2. 赋值运算符 += -= *= /= %= =
    3. 前置与后置运算符 ++ --
    4. 字符串连接符 .
    5. 关系运算[比较运算符] == === >= <= < >
    6. 逻辑运算符[&&||!]
    7.三元运算符(表达式)?a:b;
    8.位运算[位与 位或 异或 取反 左移 右移]
        计算机处理二进制是按补码来算的.
        正数的原码,反码,补码都一样
        负数人反码是在原码上取反,补码是在反码上加1*/
        //&位与 同1为1
            $intData1 = 12;
            $intData2 = 3;
            echo $intData1&$intData2;

            /*
            00001100
            00000011
            ----------
            00000000*/

        //|位或 是要有1就为1
            $intData1 = 12;
            $intData2 = 3;
            echo $intData1|$intData2;
            /*
            00001100
            00000011
            --------
            00001111*/
        //^异或 互斥为1
            $intData1 = 12;
            $intData2 = 3;
            echo $intData1^$intData2;
           /*
            00001100
            00000011
            --------
            00001111*/
        //~取反 1为0 0为1
                $intData1 = 12;
                $intData2 = 3;
                echo ~$intData1;
                /*
                00001100
                --------
                11110011
            -         1
            ------------
                11110010
            ~        
            ------------
                10001101
            ------------
                -13*/
        //<<左移 高位移出,低位补0
            $intData1 = 12;
            $intData2 = 3;
            echo $intData1<<2;
            /*
            00001100
            --------
            00110000*/
        //>>右移 低位移出,高位补符号位
            $intData1 = 12;
            $intData2 = 3;
            echo $intData1>>2;
            /*
            00001100
            --------
            00000011*/

            $intData1 = -12;
            $intData2 = 3;
            echo $intData1>>2;
             /*
             10001100
             --------
             11110011
             --------
             11110100
             --------
             11111101
             --------
             11111100
             --------
             00000011*/

//加密
function jiami($dada,$key){
    return $dada^$key;
}
//解密
function jiemi($result,$key){
    return $result^$key;
}
$key = md5('qwerasfzxcv');
echo $key;
echo '<hr/>';
$dada = 'hollo world';
$resu = jiami($dada,$key);
echo $resu;
echo '<hr/>';
echo jiemi($resu,$key);
?>