PHP基础 -（二）分支与循环、php模板语法

1. 实例演示分支与循环
   

<?php
$username = 'zolo';
$myname = 'zy';
printf("用户名：%s,名字：%s<hr>",$username,$myname);
$uname = &$myname;
printf("u用户名：%s,名字：%s<br>",$uname,$myname);
if($uname == $myname){
    printf("u用户名：%s,名字：%s<br>",$uname,$myname);
}else{
    echo '不相等<br>';
}
echo $uname == $myname ?  '相等<br>': '不相等<br>';
//echo infoSalary(10000);
//echo call_user_func('infoSalary',12345);
class Demo{
    public function infoSalary($salary){
        return $salary.'<br>';
    }
}
class Demo1{
    public static function infoSalary($salary){
        return $salary.'<br>';
    }
}
echo call_user_func([(new Demo),'infoSalary'],'2223332');
echo call_user_func(['Demo1','infoSalary'],'00000009999');
$username = 'zolo1';
$psw = '123123';
if ($username == 'zolo'){
    echo '用户名正确'.'<br>';
    if($psw == '123123'){
        echo '密码正确'.'<br>';
    }else{
        echo '密码错误'.'<br>';
    }
}else{
    echo '用户名错误'.'<br>';
}
$age = 15;
switch (true) {
    case $age >= 18 && $age < 30:
        echo "{$age}岁, 已成年<br>";
        break;
    case $age >= 30 && $age < 45:
        echo "{$age}岁, 老了<br>";
        break;
    case $age >= 45:
        echo "{$age}岁, 太老了 <br>";
        break;
    default:
        echo "{$age}岁, 小屁孩 <br>";
}
$colors = ['red','green','blue','dark'];
$list  = '<ul style="border:1px solid;background: pink;display:inline-block">';
for ($i = 0; $i < count($colors); $i++) {
    // 只输出前二个
    // if ($i > 1) break;
    // 跳过第2个,只输出第1个和第3,4个
    // if ($i === 1) continue;
    // $list .= "<li>{$colors[$i]}</li>";
    $list =$list."<li>{$colors[$i]}</li>";
}
echo $list;
echo '</ul><hr>';

1. 实例演示php模板语法与html混编技巧
   

$users = [
    0 => ['id' => 1, 'name' => 'ZOLO1', 'gender' => 0, 'age' => 28],
    1 => ['id' => 2, 'name' => 'ZOLO2', 'gender' => 1, 'age' => 10],
    2 => ['id' => 3, 'name' => 'ZOLO3', 'gender' => 0, 'age' => 35],
];
$table = '<table border="1" width="400" cellspacing="0" cellpadding="3" align="center">
<caption>用户信息表</caption>
<thead bgcolor="#ccc">
<tr>
<th>id</th>
<th>用户名</th>
<th>性别</th>
<th>年龄</th>
</tr>
</thead>
<tbody align="center">';
foreach($users as $user){
    // echo  print_r($user,true);
    //print_r($user);
    // 1->true, 0->false 
    $table .= '<tr>
    <td>' . $user['id'] . '</td>
    <td>' . $user['name'] . '</td>
    <td>' . ($user['gender'] ? '女' : '男') . '</td>
    <td>' . $user['age'] . '</td></tr>';
}
$table .= '</tbody></table>';
echo $table;