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// 单分支$age = 19;if($age >= 18){echo '满18岁,已成年'. '<br>';}// 双分支$age = 12;if($age >= 18){echo '满18岁,你已成年<br>';} else{echo '你未成年,请家长陪同<br>';}// 双分支语法糖: 三元运算符echo $age >=18 ? "满18岁,你已成年" : "你未成年,请家长陪同";echo '<br>';// 多分支$age = 49;if ($age < 18){echo '你还是努力上学吧<br>';} elseif ($age = 18){echo '买房的钱存够了吗<br>';} elseif ($age > 50){echo '房贷供完了吗';}// 多分支语法糖 switch$age = 61;switch(true){case $age > 12 && $age <=24;echo '还在上学奋斗中';break;case $age > 25 && $age <=40;echo '还在苦逼打工';break;case $age > 41 && $age <=65;echo '在公司养老中';break;case $age > 66 && $age <=80;echo '退休中';break;}
namespace _0809;// 用二维数组来模拟数据表查询结果$stus = [['id' => 1, 'name' => '张三', 'gender' => '男', 'score' => 83],['id' => 2, 'name' => '李四', 'gender' => '女', 'score' => 66],['id' => 3, 'name' => '刘五', 'gender' => '男', 'score' => 42],['id' => 4, 'name' => '钱六', 'gender' => '女', 'score' => 90],['id' => 5, 'name' => '陈七', 'gender' => '男', 'score' => 55],['id' => 6, 'name' => '赵八', 'gender' => '女', 'score' => 45],['id' => 7, 'name' => '马九', 'gender' => '男', 'score' => 75],['id' => 8, 'name' => '陆十', 'gender' => '男', 'score' => 88],]?><!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>学生信息表</title><style>table {border-collapse: collapse;width: 360px;text-align: center;}table th,table td {border: 1px solid #000;padding: 5px;}table caption {font-size: 1.3em;}table thead {background-color: lightcyan;}.active {color: red;}</style></head><body><table><thead><tr><th>ID</th><th>姓名</th><th>性别</th><th>成绩</th></tr></thead><tbody><?php foreach($stus as $stu): ?><tr><td><?=$stu['id']?></td><td><?=$stu['name']?></td><td><?=$stu['gender']?></td><td><?=$stu['score']?></td></tr><?php endforeach ?></tbody></table></body></html>