More than 80% of high-paying job demands are for PHP skills
More than 80% of high-paying job requirements are for PHP technology
With the continuous development of information technology, more and more companies are realizing the importance of building their own online businesses importance. As a fast-developing and highly flexible Web development language, PHP has become one of the preferred technologies among many enterprises. According to reports, more than 80% of high-paying job demands are related to PHP technology. This article will discuss the application of PHP technology in actual development and provide some code examples as a reference.
- Database connection
In most web applications, data storage and management are extremely important. PHP provides a variety of database connection methods. The most commonly used is to connect to the database through PHP's extension library mysqli or PDO. The following is a simple example of using mysqli to connect to a MySQL database and execute queries:
<?php
$servername = "localhost";
$username = "root";
$password = "password";
$dbname = "myDB";
// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);
// 检查连接是否成功
if ($conn->connect_error) {
die("连接失败: " . $conn->connect_error);
}
// 执行查询
$sql = "SELECT * FROM users";
$result = $conn->query($sql);
// 处理查询结果
if ($result->num_rows > 0) {
while($row = $result->fetch_assoc()) {
echo "ID: " . $row["id"]. " - 姓名: " . $row["name"]. "<br>";
}
} else {
echo "0 结果";
}
// 关闭连接
$conn->close();
?>- Form processing
Forms often appear in web development. It is the interaction between users and the website. A common way to interact. Through PHP, we can easily process form data submitted by users and perform corresponding operations. The following is a simple form processing example:
<!DOCTYPE html>
<html>
<body>
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">
姓名：<input type="text" name="name">
<input type="submit" name="submit" value="提交">
</form>
<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
$name = $_POST['name'];
echo "你提交的姓名是：" . $name;
}
?>
</body>
</html>- Image processing
Image processing is one of the commonly used functions in modern web applications. PHP provides many powerful image processing libraries, allowing us to easily perform various operations on images. The following is an example of using the PHP GD library to create thumbnails:
<?php
// 原始图像路径
$src = 'image.jpg';
// 目标图像宽度和高度
$thumbWidth = 200;
$thumbHeight = 200;
// 创建原始图像资源
$srcImage = imagecreatefromjpeg($src);
// 获取原始图像的宽度和高度
$srcWidth = imagesx($srcImage);
$srcHeight = imagesy($srcImage);
// 创建目标图像资源
$thumbImage = imagecreatetruecolor($thumbWidth, $thumbHeight);
// 将原始图像复制到目标图像，并按比例调整大小
imagecopyresampled($thumbImage, $srcImage, 0, 0, 0, 0, $thumbWidth, $thumbHeight, $srcWidth, $srcHeight);
// 输出目标图像到浏览器
header('Content-Type: image/jpeg');
imagejpeg($thumbImage);
// 释放资源
imagedestroy($srcImage);
imagedestroy($thumbImage);
?>Through the above example, we can see the powerful application of PHP technology in web development. Whether it is database connection, form processing or image processing, PHP can provide convenient and efficient solutions. Therefore, learning and mastering PHP technology will provide job seekers with more opportunities and higher salaries. For enterprises, having skilled PHP development talents can also add more value to their business. Therefore, understanding and applying PHP technology is a wise choice for both job seekers and enterprises.
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