php实例大全(php简单实例)-不念博客

PHP是一种广泛使用的服务器端脚本语言，用于创建动态Web应用程序。

以下是一些PHP实例，涵盖了常用功能和概念。

1、输出“Hello, World!”：


<?php
echo "Hello, World!";
?>
<?php
echo "Hello, World!";
?>
<?php
echo "Hello, World!";
?>

2、变量和字符串连接：


<?php
$name = "John";
echo "Hello, " . $name . "!";
?>
<?php
$name = "John";
echo "Hello, " . $name . "!";
?>
<?php
$name = "John";
echo "Hello, " . $name . "!";
?>

3、条件语句：


<?php
$age = 18;
if ($age >= 18) {
    echo "You are an adult.";
} else {
    echo "You are not an adult.";
}
?>
<?php
$age = 18;

if ($age >= 18) {
    echo "You are an adult.";
} else {
    echo "You are not an adult.";
}
?>
<?php
$age = 18;

if ($age >= 18) {
    echo "You are an adult.";
} else {
    echo "You are not an adult.";
}
?>

4、循环语句：


<?php
for ($i = 1; $i <= 5; $i++) {
    echo "Number: " . $i . "<br>";
}
?>
<?php
for ($i = 1; $i <= 5; $i++) {
    echo "Number: " . $i . "<br>";
}
?>
<?php
for ($i = 1; $i <= 5; $i++) {
    echo "Number: " . $i . "<br>";
}
?>

5、数组：


<?php
$fruits = array("apple", "banana", "cherry");
foreach ($fruits as $fruit) {
    echo $fruit . "<br>";
}
?>
<?php
$fruits = array("apple", "banana", "cherry");

foreach ($fruits as $fruit) {
    echo $fruit . "<br>";
}
?>
<?php
$fruits = array("apple", "banana", "cherry");

foreach ($fruits as $fruit) {
    echo $fruit . "<br>";
}
?>

6、函数：


<?php
function greet($name) {
    return "Hello, " . $name . "!";
}
echo greet("John");
?>
<?php
function greet($name) {
    return "Hello, " . $name . "!";
}

echo greet("John");
?>
<?php
function greet($name) {
    return "Hello, " . $name . "!";
}

echo greet("John");
?>

7、从表单获取数据：

假设有一个名为form.html的HTML文件：


<form action="process_form.php" method="post">
  Name: <input type="text" name="name"><br>
  <input type="submit">
</form>
<form action="process_form.php" method="post">
  Name: <input type="text" name="name"><br>
  <input type="submit">
</form>
<form action="process_form.php" method="post">
  Name: <input type="text" name="name"><br>
  <input type="submit">
</form>

创建一个名为process_form.php的PHP文件，以处理表单数据：


<?php
$name = $_POST["name"];
echo "Hello, " . $name . "!";
?>
<?php
$name = $_POST["name"];
echo "Hello, " . $name . "!";
?>
<?php
$name = $_POST["name"];
echo "Hello, " . $name . "!";
?>

8、连接到MySQL数据库：


<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "my_database";
// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);
// 检查连接
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}
// 查询示例
$sql = "SELECT id, name FROM users";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
    // 输出数据
    while ($row = $result->fetch_assoc()) {
        echo "id: " . $row["id"] . " - Name: " . $row["name"] . "<br>";
    }
} else {
    echo "0 results";
}
// 关闭连接
$conn->close();
?>
<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "my_database";

// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);

// 检查连接
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// 查询示例
$sql = "SELECT id, name FROM users";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    // 输出数据
    while ($row = $result->fetch_assoc()) {
        echo "id: " . $row["id"] . " - Name: " . $row["name"] . "<br>";
    }
} else {
    echo "0 results";
}

// 关闭连接
$conn->close();
?>
<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "my_database";

// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);

// 检查连接
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// 查询示例
$sql = "SELECT id, name FROM users";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    // 输出数据
    while ($row = $result->fetch_assoc()) {
        echo "id: " . $row["id"] . " - Name: " . $row["name"] . "<br>";
    }
} else {
    echo "0 results";
}

// 关闭连接
$conn->close();
?>