0805作业找出数组偶数和计算器

—图例

<?php
/*循环
 for foreach while  do  ..while
*/
$cities = ['合肥','南京','苏州','上海','杭州','东莞'];
/*echo current($cities);
next ($cities);
echo current($cities);
next($cities);
echo  current($cities);*/
while ( $city=current($cities)):
    echo current($cities).'<br>';
 //前移针针
    next($cities);
endwhile;
//var_dump(current($cities));
reset($cities);
var_dump($cities);
var_dump(count($cities));
//do .. while出口循环
$i=0;
do{
    echo $cities[$i];
    $i++;
}while($i<count($cities));
echo  '<hr>';
//for计算循环  for(初始条件;循环条件;更新条件){满足循环条件所执行的代码块}
for ($i=0;$i<count($cities);$i++){
    //break提前结束循环
    if($i == 2 ) continue;
    echo $cities[$i],'<br>';
}
ob_clean();
/*
 * foreach  用于遍历数组
 * foreach($array as $value){
 * 处理数组成员 $value}
*/
$cities = ['合肥','南京','苏州','上海','杭州','东莞'];
foreach($cities as $vlues ) {
    echo "<h1 style='color:pink'><center>$vlues</center></h1>";
};
$info=[['create_time'=>1321657471,'name'=>'peter'],
       ['create_time'=>1321341451,'name'=>'chloe'],
       ['create_time'=>1322312471,'name'=>'mile']];
foreach($info as $k =>$v){
    $info[$k]['create_time']=date("Y-m-d H:m:s",$v['create_time']);
}
echo '<pre>';
print_r($info);
$info1=[
    ['贵州'=>'贵阳'],
    ['贵州'=>'遵义'],
    ['贵州'=>'安顺']];
foreach($info as $k=>$value){
   ;
}
print_r($info1);
//作业1 $arr = [23,3,45,6,78,8,34],
$arr = [23,3,45,6,78,8,34];
 for($i=0;$i<count($arr);$i++){
    if(($arr[$i])%2==0){
     $a=   "$arr[$i]".',';}
}

—- 计算机器

— 图例

—- 代码区

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
<form  method="post">
    <input type="text" name="first" />
    <select name="s" id="">
        <option value="+">+</option>
        <option value="-">-</option>
        <option value="*">*</option>
        <option value="%">%</option>
        <option value="/">/</option>
    </select>
    <input type="text" name="second">
    <input type="submit" value="结果">
</form>
</body>
</html>
<?php
//判断是否PHP的得到值
$first=$_POST["first"];  //获得name为first的值
$v=$_POST["s"];        //获取name为s的值
$second=$_POST["second"];   //获取name为second的值
if($v=="+"){
    echo $first."+".$second."结果为".($first+$second);
}elseif($v== "-"){
    echo $first."-".$second."结果为".($first-$second);
}elseif($v== "*"){
    echo $first."*".$second."结果为".($first-$second);
}elseif($v=="/"){
    if($second ==0){
    echo "除数不能为0";
    }else{
        echo $first."/".$second."结果为".($first/$second);
    }
}elseif($v == "%"){
     if($second ==0){
         echo "除数不能为0";
     }else{
         echo $first."%".$second."结果为".($first%$second);
     }
}