Android programmers learn PHP development (9)-assignment comparison logical operations-PhpStorm

黄舟
Release: 2023-03-06 09:54:02
Original
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Assignment operator symbols: =, +=, -=, *=, /=, %=, .=
Comparison operator symbols: >, <, ==, >=, < ;=, ===, !=, !==
Logical operators and or &&, or or ||, not or!, xor
xor Different is true, the same is false
die() Output a message and exit the current script


<?php
    /**
     * 赋值运算符号:=,+=,-=,*=,/=,%=,.=
     */
    $a = 5;
    $name = "iwanghang"+5; // 打印结果:5
    $name2 = "iwanghang"+$a; // 打印结果:5
    echo $name."<br>";
    echo $name2."<br>";

    $a += 1; // 等同于 $a = $a + 1; 打印结果:6
    echo $a."<br>";
    $a -= 1; // 等同于 $a = $a - 1; 打印结果:5
    echo $a."<br>";

    /**---------------分割线---------------*/
    $str = "王航";
    $str2 = "安卓";
    echo $str.$str2."<br>"; // 打印结果:王航安卓
    //echo $str.$str2.5."<br>"; // 不可以直接连接5
    echo $str.$str2.$a."<br>"; // 但是可以连接$a($a的值为5),打印结果:王航安卓5
    echo "王航安卓{$a}<br>"; // 打印结果:王航安卓5
    echo "王航安卓".$a."<br>"; // 打印结果:王航安卓5
    echo &#39;王航安卓&#39;.$a.&#39;<br>&#39;; // 打印结果:王航安卓5
    echo &#39;王航安卓{$a}<br>&#39;; // 打印结果:王航安卓{$a}
    echo "王航安卓",$a,"<br>"; // 打印结果:王航安卓5

    $str .= "是"; // 打印结果:王航是
    echo $str."<br>";
    $str .= "安卓程序员"; // 打印结果:王航是安卓程序员
    echo $str."<br>";

    /**---------------分割线---------------*/
    $html = &#39;<html>&#39;;
    $html .= &#39;<body>&#39;;
    $html .= "<h1>CSDN</h1>";
    $html .= &#39;</body>&#39;;
    $html .= &#39;</html>&#39;;
    echo $html."<br>"; // 打印结果:CSDN (一级标题)

    /**
     * 比较运算符号:>,<,==,>=,<=,===,!=,!==
     */
    $a = "007";
    $b = 7;
    var_dump($a===$b); // 打印结果:bool(false) , 全等于判断(变量类型也需要相同)
    echo "<br>";
    var_dump($a==$b); // 打印结果:bool(true) , 等于判断
    echo "<br>";
    var_dump($a=$b); // 打印结果:int(7) , 赋值运算
    echo "<br>";

    /**
     * 逻辑运算符 and或者&&、or或||、not或!、xor
     * xor 不同为真,相同为假
     */
    var_dump(true && true); // 打印结果:bool(true)
    echo "<br>";
    var_dump(true && false); // 打印结果:bool(false)
    echo "<br>";
    var_dump(true || false); // 打印结果:bool(true)
    echo "<br>";
    var_dump(!true); // 打印结果:bool(false)
    echo "<br>";
    var_dump(!false); // 打印结果:bool(true)
    echo "<br>";
    var_dump(true xor false); // 打印结果:bool(true)
    echo "<br>";
    var_dump(false xor true); // 打印结果:bool(true)
    echo "<br>";
    var_dump(true xor true); // 打印结果:bool(false)
    echo "<br>";
    var_dump(false xor false); // 打印结果:bool(false)
    echo "<br>";

    /**---------------分割线---------------*/
    $year = 2016;
    if ($year%4==0 && $year%100!==0 || $year%400!==0 ){
        echo "这个年{$year}是闰年<br>"; // 打印结果:这个年2016是闰年
    }else {
        echo "这个年{$year}是平年<br>";
    }

    /**---------------分割线---------------*/
    //die("输入并退出程序!"); // 打印结果:输入并退出程序!
    //echo "666666"; // 这一行不会输出

    /**---------------分割线---------------*/
    //$link = mysql_connect("localhost","root","") or die("数据库连接失败!");

    /**---------------分割线---------------*/
    $a = 0;
    $b = 0;
    if ($a=3 && $b=3){
        $a++;
        $b++;
    }
    echo $a.",".$b."<br>"; // 打印结果:1,4

    /**---------------分割线---------------*/
    $a = 0;
    $b = 0;
    if ($a=3 || $b=3){
        $a++;
        $b++;
    }
    echo $a.",".$b."<br>"; // 打印结果:1,1

    /**---------------分割线---------------*/
    $a = 0;
    $b = 0;
    if ($a==3 || $b==3){
        $a++;
        $b++;
    }
    echo $a.",".$b."<br>"; // 打印结果:0,0
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