位運算符

wei.png

<?php
    /*
     *  位運算符號
     *
     *  位， 按位運算
     *
     *   
     *
     *    hello world 
     *
     *    hello    world 
     *
     *    h   e    l    l   o 
     *
     *    104   -  是由32位0 和 1 （二進制組成）
     *
     *
     *    104 = 64 + 32 + 8
     *
     *    0 0000000 00000000 00000000 01101000 = 104  
     *
     *
     *
     *    boolean &&  boolean  =  boolean   
     *
     *    12 &  13 = 
     *    
     *    12= 8 + 4
     *    13= 8 + 4 + 1
     *    00000000 00000000 00000000 00001100 
     *    00000000 00000000 00000000 00001101   &
     *    --------------------------------------------
     *    00000000 00000000 00000000 00001100  
     *
     *    12 
     *   
     *    65 = 64 + 1          =  1000001 
     *    97 = 64 + 32 + 1     =  1100001   &
     *    ------------------------------------------
     *                            1000001 
     */

    $a = 3;
    $b = 5;
    if($a > 5 & $b++ < 100) {
        echo "111111111111111";
    }

    echo $b;