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本文为你讲解在ubuntu 18.04操作系统下安装php7.2-mcrypt的具体步骤，请按下面步骤操作。
1.先检查版本，安装pecl支持 php -v # 检查版本，确定为php7.2 pecl version sudo apt-get install php-pear sudo apt-get install php7.2-dev
2.安装mcrypt extension mcrypt支持查看这里。 sudo apt-get -y install gcc make autoconf libc-dev pkg-config sudo apt-get -y install libmcrypt-dev sudo pecl install mcrypt-1.0.1
3.输出以下信息，直接回车就行 WARNING: channel "pecl.php.net" has updated its protocols, use "pecl channel-update pecl.php.net" to update downloading mcrypt-1.0.1.tgz ... Starting to download mcrypt-1.0.1.tgz (33,782 bytes) .........done: 33,782 bytes 6 source files, building running: phpize Configuring for: PHP Api Version: 20170718 Zend Module Api No: 20170718 Zend Extension Api No: 320170718 libmcrypt prefix? [autodetect] : building in /tmp/pear/temp/pear-build-rooteTY7Qo/mcrypt-1.0.1 running: /tmp/pear/temp/mcrypt/configure --with-php-config=/usr/bin/php-config --with-mcrypt checking for grep that handles long lines and -e... /bin/grep checking for egrep... /bin/grep -E checking for a sed that does not truncate output... /bin/sed checking for cc... cc checking whether the C compiler works... yes checking for C compiler default output file name... a.out checking for suffix of executables... checking whether we are cross compiling... no checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether cc accepts -g... yes checking for cc option to accept ISO C89... none needed checking how to run the C preprocessor... cc -E checking for icc... no checking for suncc... no checking whether cc understands -c and -o together... yes checking for system library directory... lib checking if compiler supports -R... no checking if compiler supports -Wl,-rpath,... yes checking build system type... x86_64-pc-linux-gnu checking host system type... x86_64-pc-linux-gnu checking target system type... x86_64-pc-linux-gnu checking for PHP prefix... /usr checking for PHP includes... -I/usr/include/php/20170718 -I/usr/include/php/20170718/main -I/usr/include/php/20170718/TSRM -I/usr/include/php/20170718/Zend -I/usr/include/php/20170718/ext -I/usr/include/php/20170718/ext/date/lib checking for PHP extension directory... /usr/lib/php/20170718 checking for PHP installed headers prefix... /usr/include/php/20170718 checking if debug is enabled... no checking if zts is enabled... no checking for re2c... no configure: WARNING: You will need re2c 0.13.4 or later if you want to regenerate PHP parsers. checking for gawk... gawk checking for mcrypt support... yes, shared checking for libmcrypt version... >= 2.5.6 checking for mcrypt_module_open in -lmcrypt... yes checking how to print strings... printf checking for a sed that does not truncate output... (cached) /bin/sed checking for fgrep... /bin/grep -F checking for ld used by cc... /usr/bin/x86_64-linux-gnu-ld checking if the linker (/usr/bin/x86_64-linux-gnu-ld) is GNU ld... yes checking for BSD- or MS-compatible name lister (nm)... /usr/bin/nm -B checking the name lister (/usr/bin/nm -B) interface... BSD nm checking whether ln -s works... yes checking the maximum length of command line arguments... 1572864 checking how to convert x86_64-pc-linux-gnu file names to x86_64-pc-linux-gnu format... func_convert_file_noop checking how to convert x86_64-pc-linux-gnu file names to toolchain format... func_convert_file_noop checking for /usr/bin/x86_64-linux-gnu-ld option to reload object files... -r checking for objdump... objdump checking how to recognize dependent libraries... pass_all checking for dlltool... no checking how to associate runtime and link libraries... printf %s\n checking for ar... ar checking for archiver @FILE support... @ checking for strip... strip checking for ranlib... ranlib checking for gawk... (cached) gawk checking command to parse /usr/bin/nm -B output from cc object... ok checking for sysroot... no checking for a working dd... /bin/dd checking how to truncate binary pipes... /bin/dd bs=4096 count=1 checking for mt... mt checking if mt is a manifest tool... no checking for ANSI C header files... yes checking for sys/types.h... yes checking for sys/stat.h... yes checking for stdlib.h... yes checking for string.h... yes checking for memory.h... yes checking for strings.h... yes checking for inttypes.h... yes checking for stdint.h... yes checking for unistd.h... yes checking for dlfcn.h... yes checking for objdir... .libs checking if cc supports -fno-rtti -fno-exceptions... no checking for cc option to produce PIC... -fPIC -DPIC checking if cc PIC flag -fPIC -DPIC works... yes checking if cc static flag -static works... yes checking if cc supports -c -o file.o... yes checking if cc supports -c -o file.o... (cached) yes checking whether the cc linker (/usr/bin/x86_64-linux-gnu-ld -m elf_x86_64) supports shared libraries... yes checking whether -lc should be explicitly linked in... no checking dynamic linker characteristics... GNU/Linux ld.so checking how to hardcode library paths into programs... immediate checking whether stripping libraries is possible... yes checking if libtool supports shared libraries... yes checking whether to build shared libraries... yes checking whether to build static libraries... no configure: creating ./config.status config.status: creating config.h config.status: executing libtool commands running: make /bin/bash /tmp/pear/temp/pear-build-rooteTY7Qo/mcrypt-1.0.1/libtool --mode=compile cc -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1 -I. -I/tmp/pear/temp/mcrypt -DPHP_ATOM_INC -I/tmp/pear/temp/pear-build-rooteTY7Qo/mcrypt-1.0.1/include -I/tmp/pear/temp/pear-build-rooteTY7Qo/mcrypt-1.0.1/main -I/tmp/pear/temp/mcrypt -I/usr/include/php/20170718 -I/usr/include/php/20170718/main -I/usr/include/php/20170718/TSRM -I/usr/include/php/20170718/Zend -I/usr/include/php/20170718/ext -I/usr/include/php/20170718/ext/date/lib -DHAVE_CONFIG_H -g -O2 -c /tmp/pear/temp/mcrypt/mcrypt.c -o mcrypt.lo libtool: compile: cc -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1 -I. -I/tmp/pear/temp/mcrypt -DPHP_ATOM_INC -I/tmp/pear/temp/pear-build-rooteTY7Qo/mcrypt-1.0.1/include -I/tmp/pear/temp/pear-build-rooteTY7Qo/mcrypt-1.0.1/main -I/tmp/pear/temp/mcrypt -I/usr/include/php/20170718 -I/usr/include/php/20170718/main -I/usr/include/php/20170718/TSRM -I/usr/include/php/20170718/Zend -I/usr/include/php/20170718/ext -I/usr/include/php/20170718/ext/date/lib -DHAVE_CONFIG_H -g -O2 -c /tmp/pear/temp/mcrypt/mcrypt.c -fPIC -DPIC -o .libs/mcrypt.o /bin/bash /tmp/pear/temp/pear-build-rooteTY7Qo/mcrypt-1.0.1/libtool --mode=compile cc -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1 -I. -I/tmp/pear/temp/mcrypt -DPHP_ATOM_INC -I/tmp/pear/temp/pear-build-rooteTY7Qo/mcrypt-1.0.1/include -I/tmp/pear/temp/pear-build-rooteTY7Qo/mcrypt-1.0.1/main -I/tmp/pear/temp/mcrypt -I/usr/include/php/20170718 -I/usr/include/php/20170718/main -I/usr/include/php/20170718/TSRM -I/usr/include/php/20170718/Zend -I/usr/include/php/20170718/ext -I/usr/include/php/20170718/ext/date/lib -DHAVE_CONFIG_H -g -O2 -c /tmp/pear/temp/mcrypt/mcrypt_filter.c -o mcrypt_filter.lo libtool: compile: cc -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1 -I. -I/tmp/pear/temp/mcrypt -DPHP_ATOM_INC -I/tmp/pear/temp/pear-build-rooteTY7Qo/mcrypt-1.0.1/include -I/tmp/pear/temp/pear-build-rooteTY7Qo/mcrypt-1.0.1/main -I/tmp/pear/temp/mcrypt -I/usr/include/php/20170718 -I/usr/include/php/20170718/main -I/usr/include/php/20170718/TSRM -I/usr/include/php/20170718/Zend -I/usr/include/php/20170718/ext -I/usr/include/php/20170718/ext/date/lib -DHAVE_CONFIG_H -g -O2 -c /tmp/pear/temp/mcrypt/mcrypt_filter.c -fPIC -DPIC -o .libs/mcrypt_filter.o /bin/bash /tmp/pear/temp/pear-build-rooteTY7Qo/mcrypt-1.0.1/libtool --mode=link cc -DPHP_ATOM_INC -I/tmp/pear/temp/pear-build-rooteTY7Qo/mcrypt-1.0.1/include -I/tmp/pear/temp/pear-build-rooteTY7Qo/mcrypt-1.0.1/main -I/tmp/pear/temp/mcrypt -I/usr/include/php/20170718 -I/usr/include/php/20170718/main -I/usr/include/php/20170718/TSRM -I/usr/include/php/20170718/Zend -I/usr/include/php/20170718/ext -I/usr/include/php/20170718/ext/date/lib -DHAVE_CONFIG_H -g -O2 -o mcrypt.la -export-dynamic -avoid-version -prefer-pic -module -rpath /tmp/pear/temp/pear-build-rooteTY7Qo/mcrypt-1.0.1/modules mcrypt.lo mcrypt_filter.lo -lmcrypt -lltdl libtool: link: cc -shared -fPIC -DPIC .libs/mcrypt.o .libs/mcrypt_filter.o /usr/lib/libmcrypt.so /usr/lib/x86_64-linux-gnu/libltdl.so -g -O2 -Wl,-soname -Wl,mcrypt.so -o .libs/mcrypt.so libtool: link: ( cd ".libs" && rm -f "mcrypt.la" && ln -s "../mcrypt.la" "mcrypt.la" ) /bin/bash /tmp/pear/temp/pear-build-rooteTY7Qo/mcrypt-1.0.1/libtool --mode=install cp ./mcrypt.la /tmp/pear/temp/pear-build-rooteTY7Qo/mcrypt-1.0.1/modules libtool: install: cp ./.libs/mcrypt.so /tmp/pear/temp/pear-build-rooteTY7Qo/mcrypt-1.0.1/modules/mcrypt.so libtool: install: cp ./.libs/mcrypt.lai /tmp/pear/temp/pear-build-rooteTY7Qo/mcrypt-1.0.1/modules/mcrypt.la libtool: finish: PATH="/usr/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin:/sbin" ldconfig -n /tmp/pear/temp/pear-build-rooteTY7Qo/mcrypt-1.0.1/modules Libraries have been installed in: /tmp/pear/temp/pear-build-rooteTY7Qo/mcrypt-1.0.1/modules If you ever happen to want to link against installed libraries in a given directory, LIBDIR, you must either use libtool, and specify the full pathname of the library, or use the '-LLIBDIR' flag during linking and do at least one of the following: - add LIBDIR to the 'LD_LIBRARY_PATH' environment variable during execution - add LIBDIR to the 'LD_RUN_PATH' environment variable during linking - use the '-Wl,-rpath -Wl,LIBDIR' linker flag - have your system administrator add LIBDIR to '/etc/ld.so.conf' See any operating system documentation about shared libraries for more information, such as the ld(1) and ld.so(8) manual pages. Build complete. Don't forget to run 'make test'. running: make INSTALL_ROOT="/tmp/pear/temp/pear-build-rooteTY7Qo/install-mcrypt-1.0.1" install Installing shared extensions: /tmp/pear/temp/pear-build-rooteTY7Qo/install-mcrypt-1.0.1/usr/lib/php/20170718/ running: find "/tmp/pear/temp/pear-build-rooteTY7Qo/install-mcrypt-1.0.1" | xargs ls -dils 786579 4 drwxr-xr-x 3 root root 4096 Jul 6 14:35 /tmp/pear/temp/pear-build-rooteTY7Qo/install-mcrypt-1.0.1 786603 4 drwxr-xr-x 3 root root 4096 Jul 6 14:35 /tmp/pear/temp/pear-build-rooteTY7Qo/install-mcrypt-1.0.1/usr 786604 4 drwxr-xr-x 3 root root 4096 Jul 6 14:35 /tmp/pear/temp/pear-build-rooteTY7Qo/install-mcrypt-1.0.1/usr/lib 786605 4 drwxr-xr-x 3 root root 4096 Jul 6 14:35 /tmp/pear/temp/pear-build-rooteTY7Qo/install-mcrypt-1.0.1/usr/lib/php 786606 4 drwxr-xr-x 2 root root 4096 Jul 6 14:35 /tmp/pear/temp/pear-build-rooteTY7Qo/install-mcrypt-1.0.1/usr/lib/php/20170718 786601 188 -rwxr-xr-x 1 root root 189056 Jul 6 14:35 /tmp/pear/temp/pear-build-rooteTY7Qo/install-mcrypt-1.0.1/usr/lib/php/20170718/mcrypt.so Build process completed successfully Installing '/usr/lib/php/20170718/mcrypt.so' install ok: channel://pecl.php.net/mcrypt-1.0.1 configuration option "php_ini" is not set to php.ini location You should add "extension=mcrypt.so" to php.ini
4.添加扩展信息 运行：sudo nano /etc/php/7.2/mods-available/20-mcrypt.ini 添加内容：extension=mcrypt.so 然后连接到conf.d sudo ln -s /etc/php/7.2/mods-available/20-mcrypt.ini /etc/php/7.2/cli/conf.d/
5.检查扩展 php -i | grep mcrypt
6.输出以下信息就代表成功了 /etc/php/7.2/cli/conf.d/20-mcrypt.ini, Registered Stream Filters => zlib.*, string.rot13, string.toupper, string.tolower, string.strip_tags, convert.*, consumed, dechunk, convert.iconv.*, mcrypt.*, mdecrypt.* mcrypt mcrypt support => enabled mcrypt_filter support => enabled mcrypt.algorithms_dir => no value => no value mcrypt.modes_dir => no value => no value
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