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<?php/**字符串 定义在单引号、双引号、定界符中*单引号：无法解析变量与转义符，运行速度快*双引号：可以解析变量与转义符*定界符：可以解析变量与转义符，用于输出长字符串**/$msg = "开始学习PHP";$age = '38';echo '小强今年{$age}岁了。<br>';// 变量用{}号echo "小强今年{$age}岁了。<br>";$msg = "小强今年{$age}岁了。<br>";echo $msg;$msg = '第一行 \n 第二行<br>';echo $msg;$msg = "第一行 \n 第二行";echo $msg . "<hr>";// 定界符$html = <<<LIST<ul><li>单引号：无法解析变量与转义符，运行速度快</li><li>双引号：可以解析变量与转义符</li><li>定界符：可以解析变量与转义符，用于输出长字符串</li></ul>LIST;echo $html;
<?PHP/** 遍历数组* foreach ($arr as $index => $value)*/?><!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title> 遍历数组</title></head><body><ul><?PHP// 定义数组，模拟导向栏数据库$nav = [['id' => 1, 'navName' => '前端学习'],['id' => 2, 'navName' => '后端学习'],['id' => 3, 'navName' => '微信学习'],['id' => 4, 'navName' => '辅助学习'],['id' => 5, 'navName' => '可视化布局'],['id' => 6, 'navName' => 'PHP管理系统']];// 遍历数组输出导向栏// 不需要id所以可省略参数foreach ($nav as $navName) {echo "<li>{$navName['navName']}</li>";}?></ul></body></html>
<!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>自定义函数</title></head><body><style>td {padding: 15px;}</style><table><thead><tr><td>商品名称</td><td>单位</td><td>单价</td><td>数量</td><td>合计</td></tr></thead><tbody><?PHP// 定义商品$goods = [['id' => 1, 'name' => '纯牛奶', 'unit' => '箱', 'price' => 65, 'num' => 2],['id' => 2, 'name' => '面粉', 'unit' => '5Kg', 'price' => 25, 'num' => 5],['id' => 3, 'name' => '矿泉水', 'unit' => '件', 'price' => 16, 'num' => 3]];// 遍历数组foreach ($goods as $v) {$t = total($v['price'], $v['num']);$html = <<<TABLE<tr><td>{$v['name']}</td><td>{$v['unit']}</td><td>{$v['price']}</td><td>{$v['num']}</td><td>{$t}</td></tr>TABLE;echo $html;}// 定义函数计算商品合计价function total($price, $goodsNum){return $price * $goodsNum;}?></tbody></table></body></html>
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