PHP source code installation does not have the gd library-PHP Tutorial-php.cn

Home

Backend Development

PHP Tutorial

PHP source code installation does not have the gd library

WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB

Jul 30, 2016 pm 01:31 PM

nbspphp

The GD library added by general source code installation does not support images in jpeg format. It only supports the following formats

GD Support enabled
GD Version bundled (2.0.34 compatible)
GIF Read Support enabled
GIF Create Support enabled
PNG Support enabled
libPNG Version 1.2.49
WBMP Support enabled
XBM Support enabled
Let’s add support for jpeg format files
wget http://www.ijg.org/files/jpegsrc.v8b.tar.gz

tar -zxvf jpegsrc.v8b.tar.gz
cd jpeg-8b

./configure --prefix=/usr/local/jpeg --enable-shared --enable-static
make && make install

Enter the php source code directory below The gd directory under ext

Enter the gd directory and execute Note that /usr/local/php/ below is the installation path of your server php. Mine is the path written like this

/usr/local/php/bin/phpize

./configure --with-php-c/local/php/bin/php-config --with-jpeg- dir=/usr/local/jpeg/

make && make install

After executing these, the system will prompt you to generate the gd.so directory

Add gd.so under php.ini and restart php. Restart the application server and it will be OK.

Some machines may not work, this is the solution

yum install libjpeg-devel freetype-devel libpng-devel
make clean and then re./configure
make&make install

Check phpinfo OK

GD Support enabled

GD Version 2.0
GIF Read Support enabled
GIF Create Support enabled
JPEG Support enabled
libJPEG Version unknown
PNG Support enabled
libPNG Version 1.2.10
WBMP Support enabled

GD Support enabled
GD Version bundled (2.0.34 compatible)
GIF Read Support enabled
GIF Create Support enabled
JPEG Support enabled
libJPEG Version 8
PNG Support enabled
libPNG Version 1.2.49
WBMP Support enabled
XBM Support enabled

Directive Local Value Master Value
gd.jpeg_ignore_warning 0 0

Copyright Statement: This article is an original article by the blogger and may not be reproduced without the blogger's permission.

The above introduces the PHP source code installation without the gd library, including the relevant aspects. I hope it will be helpful to friends who are interested in PHP tutorials.

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?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.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?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?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.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.Apr 29, 2025 am 12:39 AM

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

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.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