The php program consists of several parts

The php program consists of 5 parts, namely: 1. The start tag ""; 2. The delimiter of the PHP statement ";"; 3. Comments include single-line comments "//" and multi-line comments "/*...*/"; 4. Line breaks, which can enhance the readability of the code; 5. Code segments (such as functions, etc.).

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

PHP Components of the program

1. Starting and ending tags, all PHP code must be written inside this pair of tags

// 起始标签
<?php

// 结束标签
?>

2.";": The semicolon is the delimiter of PHP statements and also represents the instruction for code execution

$name = 'PHP中文网';
echo $name;

3. Comment: '//' is a single-line comment '/*...*/' is a multi-line comment

// 这是单行注释

/*
这是
多行
注释
*/

# 也可用作注释但不推荐

4. Appropriately add newline indentation between statements to enhance the readability of the code

// 可读性较差
$name = 'PHP中文网'；echo $name;

// 适当加上换行可读性会更好
$name = 'PHP中文网';
echo $name;

5. Code segment (such as function...)

function sum(int $a, int $b){
    // return意思是返回结果给调用者
    return ($a+$b);
}

// 执行，在客户端打印结果并输出
echo sum(10,20);

Recommended learning: "PHP Video Tutorial"

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