Home > Article > Backend Development > A Beginner's Guide to Basic PHP Syntax
PHP is an open source server-side programming language for writing Web applications. It has the advantages of being easy to learn, flexible, and highly efficient in development, so it is widely used in Web development.
However, learning the basic syntax of PHP is often a difficult process for beginners. Therefore, this guide will provide you with introductory knowledge of PHP basic syntax, allowing you to easily master the basics of PHP
<!DOCTYPE html> <html> <head> <title>PHP示例程序</title> </head> <body> <?php echo "Hello, PHP!"; ?> </body> </html>
In the above code, the PHP code is included between the bb9bd6d87db7f8730c53cb084e6b4d2d
tags and can be embedded in the HTML tags.
<?php $name = "Mike"; $age = 24; ?>
Variable names are case-sensitive and must meet the following rules:
$name = 'Mike'; $message = "Hello, $name!";
$number1 = 10; $number2 = 012; // 八进制 $number3 = 0xA; // 十六进制
$float1 = 3.14; $float2 = 1.0e3; // 必须有小数点
$is_true = true; $is_false = false;
$a = 10; $b = 5; $c = $a + $b; // 15 $d = $a - $b; // 5 $e = $a * $b; // 50 $f = $a / $b; // 2
$a = 10; $b = 5; $c = 10; var_dump($a == $b); // false var_dump($a != $b); // true var_dump($a === $c); // true var_dump($a !== $c); // false var_dump($a > $b); // true var_dump($a < $b); // false var_dump($a >= $b); // true var_dump($a <= $b); // false
$a = 10; $b = 5; $c = 1; var_dump(($a > $b) && ($c > $b)); // true var_dump(($a < $b) || ($c > $b)); // true var_dump(!($a < $b)); // true
$a = 10; $b = 5; if ($a > $b) { echo 'a > b'; } elseif ($a == $b) { echo 'a == b'; } else { echo 'a < b'; }
$arr = array('apple', 'banana', 'orange'); foreach ($arr as $value) { echo $value; }
Among them, $value represents each element in the array. In addition, there are loop statements similar to while, do...while, which are skipped here.
function say_hello($name) { echo "Hello, $name!"; } say_hello('Mike'); // Hello, Mike!
$name = 'Mike'; $length = strlen($name); // 计算字符串长度 $upper = strtoupper($name); // 将字符串转换为大写 echo $length, $upper; // 输出8MIKE
The above is an introductory guide to the basic syntax of PHP. Of course, there are many details and knowledge to learn. I hope this guide is helpful and allows you to quickly get started with PHP development.
The above is the detailed content of A Beginner's Guide to Basic PHP Syntax. For more information, please follow other related articles on the PHP Chinese website!