Open PHP GD library support under Linux

php5-m | Grep-i GD Or Php-i | Grep-i--color GD Copy Code 2, if the GD library is not installed, the server installation, the method is as follows # If the source is installed, add the parameter --with-gd # if it's a Debian Linux system, install it with Apt-get, as follows Apt-get Install PHP5-GD # if it's a centos system, install it with Yum, as follows Yum Install PHP-GD # if it is a Linux system from SuSE, install it with YaST as follows Yast-i PHP5_GD Copy Code 3, can be compiled in the original PHP does not support the case of GD with the first zlib source code, libpng source, GD source code extracted to the source directory zlib directory ./configure--prefix=/usr/local/zlib make; Make install Make clean Copy Code Libpng Directory CP Scripts/makefile.linux./makefile ./configure--prefix=/usr/local/libpng make; Make install Make clean # GD Directory ./configure--PREFIX=/USR/LOCAL/LIBGD--with-png=/usr/local/libpng make; Make install Make clean Copy Code Finally in the php.ini, after searching [GD], add a line below Extension=/usr/local/libgdgd.so Copy Code Then restart the PHP service, if not, then try to reboot, there should be no problem. Problem Analysis: Source installation, only add GD library in this case, the PHP version and the version of the library are different, so:-not guaranteed to pay so much after the return-not guaranteed to successfully load gd.so-not guaranteed not pregnant therefore, if the source is installed, it is best to compile PHP with parameters--WITH-GD In addition, under windows open the PHP GD library support, the operation method is as follows: Find php.ini, open content, find: ; Extension=php_gd2.dll Copy Code Put the front of the semicolon ";" Remove, and then save, if there is no semicolon, it is open. >>> Further reading: PHP GD library upload images and create thumbnails of code PHP GD library generated Verification code example PHP GD library Chinese garbled Solution PHP Verification code (GD Library Generation Verification Code) examples of PHP open Gd2 extension method introduction Linux under Installation PHP GD Support Library method PHP GD library Drawing Instance code of 24 hour histogram PHP GD library dynamic Generation Line chart Instance code PHP thumbnail generation class (support ImageMagick and GD library)

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