PHP(第一天)

<?php
 
//   $name='lisi';
//  $age =18;
//$bol =true;
//$bol =false;
//   echo ($bol);
//echo ('name is'.$name.'<br/>age is'.$age)
//if($age>=18)
//{
//    echo ('ok');
//}
//else{
//    echo ('no');
 
//}
//for($i=0;$i<10;$i++ ) {
//    echo($i . ' ');
//}
//$x=5;
//$y=6;
//$z=$x+$y;
//echo ($z.'');
 
//$x=8;
//
//
//function myTest(){
//    $y=7;
//    echo ($y.''.'<br/>');
//
//}
//myTest();
//echo "x=$x";
 
//$x=5;
//$y=8;
//function myTest(){
//    global $x,$y;//global 全局变量 ocal局部变量 static静态变量
//    $y=$x+$y;
//
//}
//
//myTest();
//echo "$y";
 
//$x=6;
//$y=7;
//function myTest(){
//    $GLOBALS['y']=$GLOBALS['y']+$GLOBALS['x'];
//
//}
//myTest();
//echo "$y";
 
//function myTest(){
//    static $x=0;
//    echo  "$x<br/>";
//    $x++;
//}
//myTest();
//myTest();
//myTest();
//myTest();
//myTest();
//myTest();
//myTest();
//myTest();
//myTest();
//myTest();
//myTest();
//myTest();
 
//for($i=0;$i<6;$i++){
//    for($j=6;$j>$i;$j--){   //直角三角形
//        echo " ";
//    }
//    for($k=0;$k<$i;$k++){
//        echo "*";
//    }
//    echo "<br/>";
//}
//echo "PHP  很有趣<br>";
//echo "HEllo world<br>";
//echo "我觉得学习PHP<br>";
 
//$tex1="learn PHP";
//$tex2="baidu.com";
//$cars=array("Vovol","COcol","BObol");
//echo "$tex1<br>";
//echo "$tex2<br>";
//for($i=0;$i<3;$i++){//输出整个集合
//    echo "$cars[$i]<br>";
//}
 
//$x=5950.553;
//var_dump($x);//输出int类型或则float类型
//echo "<br>";
//$x = -345; // 负数
//var_dump($x);
//echo "<br>";
//$x = 0x8C; // 十六进制数
//var_dump($x);
//echo "<br>";
//$x = 047; // 八进制数
//var_dump($x);
//$x=2.4e3;
//echo "<br>";
//var_dump($x);
 
//$cars=array("Volvo","BMW","SAAB");
//var_dump($cars);//集合全部输出
 
class Car
{
    var $color;
    function Car($color="green") {
        $this->color = $color;
    }
    function what_color() {
        return $this->color;
    }
}
 
function print_vars($obj) {
    foreach (get_object_vars($obj) as $prop => $val) {//不懂,明天请教
        echo "\t$prop = $val\n";
    }
}
 
// instantiate one object
$herbie = new Car("white");
 
// show herbie properties
echo "\herbie: Properties\n";
print_vars($herbie);
 
//$x="Hello world!";
//$x=null;       //输出NULL
//var_dump($x);
 
//echo strlen("qianlilin nihao!");//计算字符串的长度(包括空格,符号)
 
//echo strpos("qianlilin nihao!","nihao");//返回首个匹配字符串的位置
 
//define("GREETING","welcome qianlilin");//类似于关键字输出
//echo GREETING   ;
//echo "<br/>";
 
//$x=10;
//$y=6;
//echo ($x + $y); // 输出 16
//echo "<br/>";
//echo ($x - $y); // 输出 4     元素符
//echo "<br/>";
//echo ($x * $y); // 输出 60
//echo "<br/>";
//echo ($x / $y); // 输出 1.6666666666667
//echo "<br/>";
//echo ($x % $y); // 输出