PHP-day02

/*函数的调用;给函数设置默认值*/function showSelf($name = ‘lemon‘, $age = 18){    echo "{$name}今年{$age}了";}

showSelf(‘小明‘);

/*判断函数是否已经存在*/if (function_exists("showSelf")) {    showSelf("张三", 22);} else {    echo "当前函数不存在";}echo "<br>";/*global关键字使用全局变量*/$age = 10;function num1(){    global $age;    echo $age;    $age = 20;}

function num2(){    global $age;    echo $age;}

num1();num2();

/*静态变量，只初始化一次内存，会改变变量的生命周期，直到文档结束*/function fn1(){    static $age = 10;    $age++;    echo $age . "<br>";}

fn1();fn1();fn1();

/*函数的调用*/function fn2(){    echo "fn2被调用了";}

$f = "fn2";$f();

/*回调函数*/function showNum($f1){    for ($i = 1; $i <= 100; $i++) {

        if ($f1($i)) {            echo $i . "  ";        }    }}

function even($num){    return $num % 2;}

echo "<br>";showNum("even");function oven($num){    return !($num % 2);}

showNum("oven");echo "<br>";function five($num){    return $num % 10 == 5;}

showNum("five");echo "<br>";echo "/*************************数组*****************************/";echo "<br>";/*************************数组*****************************///数组的定义//1、直接赋值方式；$array[0] = "1";$array[1] = "2";$array[2] = "3";$array[4] = "5";$array[‘haha‘] = "hahah";$array[3] = "4";print_r($array);echo "<br>";//2、关联数组$array2["name"] = "lemon";$array2["age"] = "18";print_r($array2);

echo "<br>";

//2、通过array定义数组$array3 = array(1, 2, 3, 4, "lemon");print_r($array3);

echo "<br>";//按顺序向数组添加数据$array4 = array();$array4[] = 0;$array4[] = 1;$array4[] = 2;$array4[] = 3;print_r($array4);echo "<br>";

/*遍历数组*/for ($i = 0; $i < count($array4); $i++) {    echo $array[$i] . " ";};echo "<br>";foreach ($array2 as$item) {    echo $item;};echo "<br>";foreach ($array2 as $key=>$item) {    echo $key."=".$item;};echo"<br>";/*************************get和post请求*************************************/echo"<a href=‘child/judge.php?useName=lemon&passWord=123456‘>点击登录</a>";echo"<br>";echo"<form action=‘child/judge.php‘ method=‘post‘>";echo"<input name=‘userName‘ type=‘text‘>";echo"<input name=‘passWord‘ type=‘password‘>";echo"<input type=‘submit‘>";echo"</form>";