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Home Backend Development PHP Problem Several aspects of content can be included in the .php file

Several aspects of content can be included in the .php file

Mar 06, 2023 pm 05:32 PM
php php file

Contents that can be included in the php file: 1. The starting tag "", all PHP code must be written inside this pair of tags; 2. The semicolon ";" is the PHP statement The delimiter also represents the instruction for code execution; 3. Comments, including single-line comments "http://", multi-line comments "/* */", and Shell comments "#"; 4. Line breaks, which can be enhanced Code readability; 5. Code segments (such as functions, etc.).

Several aspects of content can be included in the .php file

The operating environment of this tutorial: windows7 system, PHP8 version, DELL G3 computer

PHP is a super text preprocessing language ( Abbreviation for Hypertext Preprocessor).

What is a php file?

The name format of a php file is a programming language format, more technically speaking, a scripting language embedded in HTML text , the language style is similar to C language, and the syntax combines C, Perl, Java and PHP's own innovative syntax forms, and is often widely used by website programmers. This kind of file is generally executed on the server side, which can fully utilize the performance of the server and execute dynamic web pages faster than CGL and Perl. Its execution engine can also keep frequently accessed programs in the memory so that the user can access them next time. There is no need to recompile the program, just execute the retained code directly, which is very efficient.

The most powerful feature of the php file is its database integration layer. With this feature, it becomes very simple to use php files to create a web page with a database. The function of the php file also depends on its Compatibility with various databases, in addition to using HTTP communication, php files can also use IMAP, SNMP, POP3 and NNTP protocols.

How many contents does the php file contain?

1. Start and end tags. All PHP code must be written inside this pair of tags.

// 起始標(biāo)簽
<?php

// 結(jié)束標(biāo)簽
?>

2. ";": The semicolon is the delimiter of PHP statements. Also represents the instructions for code execution

$name = &#39;PHP中文網(wǎng)&#39;;
echo $name;

3. Comments:

PHP supports 3 comment styles: C, C and Unix Shell style (Perl style)

  • ① Single-line comment (C style), symbol: //

  • ②Multi-line comment (C style), symbol: /* */

  • ③Special single-line comments (not commonly used, Shell style), symbol:

#
<?php
echo "單行注釋" ;//一般在代碼右邊少量說明或?qū)懺诖a前面使之失效

echo "多行注釋" ;
/*
一般說明腳本的相關(guān)信息,如版本,版權(quán),作者日期等
使一長段代碼失效
*/

echo "單行注釋" ;#一般在代碼右邊少量說明或?qū)懺诖a前面使之失效
?>

Several aspects of content can be included in the .php file

Description: Single-line comments only Comment to the end of the line or the current PHP code block (even if there is "?>" at the end of the line, it will not be commented. When PHP encounters "?>", it will jump out of PHP mode and then parse the HTML code or other)

4. Newline characters

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

// 可讀性較差
$name = 'PHP中文網(wǎng)';echo $name;

// 適當(dāng)加上換行可讀性會更好
$name = &#39;PHP中文網(wǎng)&#39;;
echo $name;

5. Code segments (such as functions...)

function sum(int $a, int $b){
    // return意思是返回結(jié)果給調(diào)用者
    return ($a+$b);
}

// 執(zhí)行,在客戶端打印結(jié)果并輸出
echo sum(10,20);

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