search
HomeBackend DevelopmentPHP TutorialDefinition and usage of php htmlentities() function

php htmlentities() function converts characters into HTML entities. This article introduces the basic usage and examples of the php htmlentities() function to coders. Coders in need can refer to it.

Definition and Usage

htmlentities() function converts characters into HTML entities.

Tip: To convert HTML entities back to characters, use the html_entity_decode() function.

Tip: Please use the get_html_translation_table() function to return the translation table used by htmlentities().

Syntax

htmlentities(string,flags,character-set,double_encode)

php htmlentities()函数的定义和用法

Technical details

php htmlentities()函数的定义和用法

Example 1

Convert characters to HTML entities:

<?php
$str = "Bill & &#39;Steve&#39;";
echo htmlentities($str, ENT_COMPAT); // 只转换双引号
echo "<br>";
echo htmlentities($str, ENT_QUOTES); // 转换双引号和单引号
echo "<br>";
echo htmlentities($str, ENT_NOQUOTES); // 不转换任何引号
?>

The HTML output of the above code is as follows (View Source code):

<!DOCTYPE html>
<html>
<body>
Bill & &#39;Steve&#39;<br>
Bill & &#39;Tarzan&#39;<br>
Bill & &#39;Steve&#39;
</body>
</html>

Browser output of the above code:

Bill & &#39;Steve&#39;
Bill & &#39;Steve&#39;
Bill & &#39;Steve&#39;

Example 2

Convert some characters into HTML entities by using Western European character sets:

<?php
$str = "My name is ?yvind ?sane. I&#39;m Norwegian.";
echo htmlentities($str, ENT_QUOTES, "ISO-8859-1");
// Will only convert double quotes (not single quotes), and uses the character-set Western European
?>

The HTML output of the above code is as follows (view source code ):

<!DOCTYPE html>
<html>
<body>
My name is Øyvind Åsane. I&#39;m Norwegian.
</body>
</html>

Browser output of the above code:

My name is ?yvind ?sane. I'm Norwegian.

The definition and usage of the php htmlentities() function above are all the content shared by the editor. I hope it can give you a reference, and I also hope that everyone will support the PHP Chinese website.

For more articles related to the definition and usage of the php htmlentities() function, please pay attention to the PHP Chinese website!

Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
How can you check if a PHP session has already started?How can you check if a PHP session has already started?Apr 30, 2025 am 12:20 AM

In PHP, you can use session_status() or session_id() to check whether the session has started. 1) Use the session_status() function. If PHP_SESSION_ACTIVE is returned, the session has been started. 2) Use the session_id() function, if a non-empty string is returned, the session has been started. Both methods can effectively check the session state, and choosing which method to use depends on the PHP version and personal preferences.

Describe a scenario where using sessions is essential in a web application.Describe a scenario where using sessions is essential in a web application.Apr 30, 2025 am 12:16 AM

Sessionsarevitalinwebapplications,especiallyfore-commerceplatforms.Theymaintainuserdataacrossrequests,crucialforshoppingcarts,authentication,andpersonalization.InFlask,sessionscanbeimplementedusingsimplecodetomanageuserloginsanddatapersistence.

How can you manage concurrent session access in PHP?How can you manage concurrent session access in PHP?Apr 30, 2025 am 12:11 AM

Managing concurrent session access in PHP can be done by the following methods: 1. Use the database to store session data, 2. Use Redis or Memcached, 3. Implement a session locking strategy. These methods help ensure data consistency and improve concurrency performance.

What are the limitations of using PHP sessions?What are the limitations of using PHP sessions?Apr 30, 2025 am 12:04 AM

PHPsessionshaveseverallimitations:1)Storageconstraintscanleadtoperformanceissues;2)Securityvulnerabilitieslikesessionfixationattacksexist;3)Scalabilityischallengingduetoserver-specificstorage;4)Sessionexpirationmanagementcanbeproblematic;5)Datapersis

Explain how load balancing affects session management and how to address it.Explain how load balancing affects session management and how to address it.Apr 29, 2025 am 12:42 AM

Load balancing affects session management, but can be resolved with session replication, session stickiness, and centralized session storage. 1. Session Replication Copy session data between servers. 2. Session stickiness directs user requests to the same server. 3. Centralized session storage uses independent servers such as Redis to store session data to ensure data sharing.

Explain the concept of session locking.Explain the concept of session locking.Apr 29, 2025 am 12:39 AM

Sessionlockingisatechniqueusedtoensureauser'ssessionremainsexclusivetooneuseratatime.Itiscrucialforpreventingdatacorruptionandsecuritybreachesinmulti-userapplications.Sessionlockingisimplementedusingserver-sidelockingmechanisms,suchasReentrantLockinJ

Are there any alternatives to PHP sessions?Are there any alternatives to PHP sessions?Apr 29, 2025 am 12:36 AM

Alternatives to PHP sessions include Cookies, Token-based Authentication, Database-based Sessions, and Redis/Memcached. 1.Cookies manage sessions by storing data on the client, which is simple but low in security. 2.Token-based Authentication uses tokens to verify users, which is highly secure but requires additional logic. 3.Database-basedSessions stores data in the database, which has good scalability but may affect performance. 4. Redis/Memcached uses distributed cache to improve performance and scalability, but requires additional matching

Define the term 'session hijacking' in the context of PHP.Define the term 'session hijacking' in the context of PHP.Apr 29, 2025 am 12:33 AM

Sessionhijacking refers to an attacker impersonating a user by obtaining the user's sessionID. Prevention methods include: 1) encrypting communication using HTTPS; 2) verifying the source of the sessionID; 3) using a secure sessionID generation algorithm; 4) regularly updating the sessionID.

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

VSCode Windows 64-bit Download

VSCode Windows 64-bit Download

A free and powerful IDE editor launched by Microsoft

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

Dreamweaver Mac version

Dreamweaver Mac version

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

WebStorm Mac version

WebStorm Mac version

Useful JavaScript development tools