You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode.

[root@localhost dreamstart]# composer install
Loading composer repositories with package information
Installing dependencies (including require-dev) from lock file
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Installation request for doctrine/orm v2.5.6 -> satisfiable by doctrine/orm[v2.5.6].
    - doctrine/orm v2.5.6 requires ext-pdo * -> the requested PHP extension pdo is missing from your system.
  Problem 2
    - Installation request for phpunit/php-code-coverage 4.0.8 -> satisfiable by phpunit/php-code-coverage[4.0.8].
    - phpunit/php-code-coverage 4.0.8 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  Problem 3
    - Installation request for phpunit/phpunit 5.7.19 -> satisfiable by phpunit/phpunit[5.7.19].
    - phpunit/phpunit 5.7.19 requires ext-dom * -> the requested PHP extension dom is missing from your system.

  To enable extensions, verify that they are enabled in your .ini files:
    - /etc/php.ini
    - /etc/php.d/bz2.ini
    - /etc/php.d/calendar.ini
    - /etc/php.d/ctype.ini
    - /etc/php.d/curl.ini
    - /etc/php.d/exif.ini
    - /etc/php.d/fileinfo.ini
    - /etc/php.d/ftp.ini
    - /etc/php.d/gettext.ini
    - /etc/php.d/gmp.ini
    - /etc/php.d/iconv.ini
    - /etc/php.d/json.ini
    - /etc/php.d/phar.ini
    - /etc/php.d/shmop.ini
    - /etc/php.d/simplexml.ini
    - /etc/php.d/sockets.ini
    - /etc/php.d/tokenizer.ini
    - /etc/php.d/xml.ini
    - /etc/php.d/zip.ini
  You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode.

======================================================================

http://stackoverflow.com/questions/35815376/to-enable-extensions-verify-that-they-are-enabled-in-those-ini-files-vagrant

 

yum install -y php56w php56w-opcache php56w-xml php56w-mcrypt php56w-gd php56w-devel php56w-mysql php56w-intl php56w-mbstring php56w-bcmath

 

 

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[root@localhost ~]# yum install -y php56w php56w-opcache php56w-xml php56w-mcrypt php56w-gd php56w-devel php56w-mysql php56w-intl php56w-mbstring php56w-bcmath Loaded plugins: fastestmirror, langpacks Repository pgdg95 is listed more than once in the configuration Repository pgdg95-source is listed more than once in the configuration Loading mirror speeds from cached hostfile  * base: mirrors.aliyun.com  * epel: mirror.lzu.edu.cn  * extras: mirrors.sohu.com  * updates: mirrors.sohu.com  * webtatic: sp.repo.webtatic.com Package php56w-5.6.30-1.w7.x86_64 already installed and latest version Resolving Dependencies --> Running transaction check ---> Package php56w-bcmath.x86_64 0:5.6.30-1.w7 will be installed ---> Package php56w-devel.x86_64 0:5.6.30-1.w7 will be installed --> Processing Dependency: pcre-devel(x86-64) for package: php56w-devel-5.6.30-1.w7.x86_64 ---> Package php56w-gd.x86_64 0:5.6.30-1.w7 will be installed --> Processing Dependency: libt1.so.5()(64bit) for package: php56w-gd-5.6.30-1.w7.x86_64 ---> Package php56w-intl.x86_64 0:5.6.30-1.w7 will be installed ---> Package php56w-mbstring.x86_64 0:5.6.30-1.w7 will be installed ---> Package php56w-mcrypt.x86_64 0:5.6.30-1.w7 will be installed --> Processing Dependency: libmcrypt.so.4()(64bit) for package: php56w-mcrypt-5.6.30-1.w7.x86_64 ---> Package php56w-mysql.x86_64 0:5.6.30-1.w7 will be installed --> Processing Dependency: php56w-pdo(x86-64) for package: php56w-mysql-5.6.30-1.w7.x86_64 ---> Package php56w-opcache.x86_64 0:5.6.30-1.w7 will be installed ---> Package php56w-xml.x86_64 0:5.6.30-1.w7 will be installed --> Running transaction check ---> Package libmcrypt.x86_64 0:2.5.8-13.el7 will be installed ---> Package pcre-devel.x86_64 0:8.32-15.el7_2.1 will be installed ---> Package php56w-pdo.x86_64 0:5.6.30-1.w7 will be installed ---> Package t1lib.x86_64 0:5.1.2-14.el7 will be installed --> Finished Dependency Resolution   Dependencies Resolved   ================================================================================  Package               Arch         Version                Repository      Size ================================================================================ Installing:  php56w-bcmath         x86_64       5.6.30-1.w7            webtatic        39 k  php56w-devel          x86_64       5.6.30-1.w7            webtatic       2.5 M  php56w-gd             x86_64       5.6.30-1.w7            webtatic       157 k  php56w-intl           x86_64       5.6.30-1.w7            webtatic       199 k  php56w-mbstring       x86_64       5.6.30-1.w7            webtatic       545 k  php56w-mcrypt         x86_64       5.6.30-1.w7            webtatic        30 k  php56w-mysql          x86_64       5.6.30-1.w7            webtatic       124 k  php56w-opcache        x86_64       5.6.30-1.w7            webtatic       110 k  php56w-xml            x86_64       5.6.30-1.w7            webtatic       170 k Installing for dependencies:  libmcrypt             x86_64       2.5.8-13.el7           epel            99 k  pcre-devel            x86_64       8.32-15.el7_2.1        base           479 k  php56w-pdo            x86_64       5.6.30-1.w7            webtatic       114 k  t1lib                 x86_64       5.1.2-14.el7           base           166 k   Transaction Summary ================================================================================ Install  9 Packages (+4 Dependent packages)   Total download size: 4.7 M Installed size: 22 M Downloading packages: (1/13): pcre-devel-8.32-15.el7_2.1.x86_64.rpm              | 479 kB   00:00     warning: /var/cache/yum/x86_64/7/epel/packages/libmcrypt-2.5.8-13.el7.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID 352c64e5: NOKEY Public key for libmcrypt-2.5.8-13.el7.x86_64.rpm is not installed (2/13): libmcrypt-2.5.8-13.el7.x86_64.rpm                  |  99 kB   00:01     (3/13): php56w-bcmath-5.6.30-1.w7.x86_64.rpm               |  39 kB   00:01     (4/13): php56w-gd-5.6.30-1.w7.x86_64.rpm                   | 157 kB   00:00     (5/13): php56w-intl-5.6.30-1.w7.x86_64.rpm                 | 199 kB   00:00     (6/13): php56w-mbstring-5.6.30-1.w7.x86_64.rpm             | 545 kB   00:01     (7/13): php56w-mcrypt-5.6.30-1.w7.x86_64.rpm               |  30 kB   00:00     (8/13): php56w-mysql-5.6.30-1.w7.x86_64.rpm                | 124 kB   00:00     (9/13): php56w-opcache-5.6.30-1.w7.x86_64.rpm              | 110 kB   00:00     (10/13): php56w-pdo-5.6.30-1.w7.x86_64.rpm                 | 114 kB   00:00     (11/13): t1lib-5.1.2-14.el7.x86_64.rpm                     | 166 kB   00:00     (12/13): php56w-xml-5.6.30-1.w7.x86_64.rpm                 | 170 kB   00:00     (13/13): php56w-devel-5.6.30-1.w7.x86_64.rpm               | 2.5 MB   00:08     -------------------------------------------------------------------------------- Total                                              552 kB/s | 4.7 MB  00:08     Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7 Importing GPG key 0x352C64E5:  Userid     : "Fedora EPEL (7) <epel@fedoraproject.org>"  Fingerprint: 91e9 7d7c 4a5e 96f1 7f3e 888f 6a2f aea2 352c 64e5  Package    : epel-release-7-5.noarch (installed)  From       : /etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7 Running transaction check Running transaction test Transaction test succeeded Running transaction   Installing : libmcrypt-2.5.8-13.el7.x86_64                               1/13   Installing : pcre-devel-8.32-15.el7_2.1.x86_64                           2/13   Installing : php56w-pdo-5.6.30-1.w7.x86_64                               3/13   Installing : t1lib-5.1.2-14.el7.x86_64                                   4/13   Installing : php56w-gd-5.6.30-1.w7.x86_64                                5/13   Installing : php56w-mysql-5.6.30-1.w7.x86_64                             6/13   Installing : php56w-devel-5.6.30-1.w7.x86_64                             7/13   Installing : php56w-mcrypt-5.6.30-1.w7.x86_64                            8/13   Installing : php56w-intl-5.6.30-1.w7.x86_64                              9/13   Installing : php56w-mbstring-5.6.30-1.w7.x86_64                         10/13   Installing : php56w-bcmath-5.6.30-1.w7.x86_64                           11/13   Installing : php56w-xml-5.6.30-1.w7.x86_64                              12/13   Installing : php56w-opcache-5.6.30-1.w7.x86_64                          13/13   Verifying  : php56w-opcache-5.6.30-1.w7.x86_64                           1/13   Verifying  : php56w-gd-5.6.30-1.w7.x86_64                                2/13   Verifying  : t1lib-5.1.2-14.el7.x86_64                                   3/13   Verifying  : php56w-devel-5.6.30-1.w7.x86_64                             4/13   Verifying  : php56w-mcrypt-5.6.30-1.w7.x86_64                            5/13   Verifying  : php56w-pdo-5.6.30-1.w7.x86_64                               6/13   Verifying  : php56w-mysql-5.6.30-1.w7.x86_64                             7/13   Verifying  : php56w-xml-5.6.30-1.w7.x86_64                               8/13   Verifying  : pcre-devel-8.32-15.el7_2.1.x86_64                           9/13   Verifying  : php56w-bcmath-5.6.30-1.w7.x86_64                           10/13   Verifying  : php56w-mbstring-5.6.30-1.w7.x86_64                         11/13   Verifying  : libmcrypt-2.5.8-13.el7.x86_64                              12/13   Verifying  : php56w-intl-5.6.30-1.w7.x86_64                             13/13   Installed:   php56w-bcmath.x86_64 0:5.6.30-1.w7      php56w-devel.x86_64 0:5.6.30-1.w7       php56w-gd.x86_64 0:5.6.30-1.w7          php56w-intl.x86_64 0:5.6.30-1.w7        php56w-mbstring.x86_64 0:5.6.30-1.w7    php56w-mcrypt.x86_64 0:5.6.30-1.w7      php56w-mysql.x86_64 0:5.6.30-1.w7       php56w-opcache.x86_64 0:5.6.30-1.w7     php56w-xml.x86_64 0:5.6.30-1.w7          Dependency Installed:   libmcrypt.x86_64 0:2.5.8-13.el7      pcre-devel.x86_64 0:8.32-15.el7_2.1       php56w-pdo.x86_64 0:5.6.30-1.w7      t1lib.x86_64 0:5.1.2-14.el7               Complete!