PHP是一种非常流行的服务器端脚本语言，其语法简单、易于学习，有着广泛的应用领域。对于想要学习PHP的人来说，练习是非常重要的一部分，因此，我们汇总了50个适合练手的PHP项目，每个项目都有相应的教程和代码演示，让你轻松学习PHP编程。
1. 简单的计算器
这是一个非常简单的项目，适合PHP初学者。它可以让你熟悉PHP的基础语法并学习如何编写简单的计算器。以下是这个项目的代码：
<?php
if(isset($_POST['submit'])){
$num1 = $_POST['num1'];
$num2 = $_POST['num2'];
$operator = $_POST['operator'];
switch($operator){
case "Add":
$result = $num1 + $num2;
break;
case "Subtract":
$result = $num1 - $num2;
break;
case "Multiply":
$result = $num1 * $num2;
break;
case "Divide":
$result = $num1 / $num2;
break;
}
}
?>
<form method="post" action="">
<input type="text" name="num1">
<select name="operator">
<option value="Add">+</option>
<option value="Subtract">-</option>
<option value="Multiply">*</option>
<option value="Divide">/</option>
</select>
<input type="text" name="num2">
<input type="submit" name="submit" value="Calculate">
</form>
<?php if(isset($_POST['submit'])){ echo $result; } ?><?php
$conn = mysqli_connect("localhost", "username", "password", "database");
if(isset($_POST['submit'])){
$name = $_POST['name'];
$message = $_POST['message'];
$sql = "INSERT INTO messages (name, message) VALUES ('$name', '$message')";
mysqli_query($conn, $sql);
}
$sql = "SELECT * FROM messages";
$result = mysqli_query($conn, $sql);
?>
<form method="post" action="">
<input type="text" name="name">
<textarea name="message"></textarea>
<input type="submit" name="submit" value="Post">
</form>
<ul>
<?php while($row = mysqli_fetch_assoc($result)){ ?>
<li><?php echo $row['name']; ?>: <?php echo $row['message']; ?></li>
<?php } ?>
</ul><?php
$conn = mysqli_connect("localhost", "username", "password", "database");
if(isset($_POST['submitpost'])){
$title = $_POST['title'];
$content = $_POST['content'];
$sql = "INSERT INTO posts (title, content) VALUES ('$title', '$content')";
mysqli_query($conn, $sql);
}
$sql = "SELECT * FROM posts";
$result = mysqli_query($conn, $sql);
?>
<form method="post" action="">
<input type="text" name="title">
<textarea name="content"></textarea>
<input type="submit" name="submitpost" value="Post">
</form>
<ul>
<?php while($row = mysqli_fetch_assoc($result)){ ?>
<li><a href="post.php?id=<?php echo $row['id']; ?>"><?php echo $row['title']; ?></a></li>
<?php } ?>
</ul>
<?php
if(isset($_GET['id'])){
$id = $_GET['id'];
$sql = "SELECT * FROM posts WHERE id='$id'";
$result = mysqli_query($conn, $sql);
$row = mysqli_fetch_assoc($result);
echo "<h1>" . $row['title'] . "</h1>";
echo "<p>" . $row['content'] . "</p>";
}
?>