一般源码安装添加的GD库 是不支持 jpeg 格式的图片的,只支持如下格式
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 |
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
下面进入到 php 源码目录下 的 ext 下的 gd目录
进入gd 目录后执行 注意下面的 /usr/local/php/ 是你服务器 php的安装路径。我的是 这个路径就写成这样了
/usr/local/php/bin/phpize
./configure --with-php-config=/usr/local/php/bin/php-config --with-jpeg-dir=/usr/local/jpeg/
make && make install
执行完这些 系统就会提示你 gd.so 生成目录
在php.ini下 添加 gd.so 后 重启php 重启 应用服务器后就OK了
有些机器可能还不行,这样解决
yum install libjpeg-devel freetype-devel libpng-devel
make clean后重新./configure
make&make install
查看phpinfo OK了
GD Support enabledGD Version 2.0GIF Read Support enabledGIF Create Support enabledJPEG Support enabledlibJPEG Version unknownPNG Support enabledlibPNG Version 1.2.10WBMP 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 |
gd.jpeg_ignore_warning | 0 | 0 |

Calculating the total number of elements in a PHP multidimensional array can be done using recursive or iterative methods. 1. The recursive method counts by traversing the array and recursively processing nested arrays. 2. The iterative method uses the stack to simulate recursion to avoid depth problems. 3. The array_walk_recursive function can also be implemented, but it requires manual counting.

In PHP, the characteristic of a do-while loop is to ensure that the loop body is executed at least once, and then decide whether to continue the loop based on the conditions. 1) It executes the loop body before conditional checking, suitable for scenarios where operations need to be performed at least once, such as user input verification and menu systems. 2) However, the syntax of the do-while loop can cause confusion among newbies and may add unnecessary performance overhead.

Efficient hashing strings in PHP can use the following methods: 1. Use the md5 function for fast hashing, but is not suitable for password storage. 2. Use the sha256 function to improve security. 3. Use the password_hash function to process passwords to provide the highest security and convenience.

Implementing an array sliding window in PHP can be done by functions slideWindow and slideWindowAverage. 1. Use the slideWindow function to split an array into a fixed-size subarray. 2. Use the slideWindowAverage function to calculate the average value in each window. 3. For real-time data streams, asynchronous processing and outlier detection can be used using ReactPHP.

The __clone method in PHP is used to perform custom operations when object cloning. When cloning an object using the clone keyword, if the object has a __clone method, the method will be automatically called, allowing customized processing during the cloning process, such as resetting the reference type attribute to ensure the independence of the cloned object.

In PHP, goto statements are used to unconditionally jump to specific tags in the program. 1) It can simplify the processing of complex nested loops or conditional statements, but 2) Using goto may make the code difficult to understand and maintain, and 3) It is recommended to give priority to the use of structured control statements. Overall, goto should be used with caution and best practices are followed to ensure the readability and maintainability of the code.

In PHP, data statistics can be achieved by using built-in functions, custom functions, and third-party libraries. 1) Use built-in functions such as array_sum() and count() to perform basic statistics. 2) Write custom functions to calculate complex statistics such as medians. 3) Use the PHP-ML library to perform advanced statistical analysis. Through these methods, data statistics can be performed efficiently.

Yes, anonymous functions in PHP refer to functions without names. They can be passed as parameters to other functions and as return values of functions, making the code more flexible and efficient. When using anonymous functions, you need to pay attention to scope and performance issues.


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