Add PHP Module

Added PHP function to produce PHP related information.

modules/php/README.md

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+PHP
+======
+
+Provides function and environment variables related to PHP.
+
+Functions
+---------
+
+  - `php-info` exposes information about the PHP environment via the
+    `$php_info` associative array.

modules/php/functions/php-info

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+#
+# Exposes information about the PHP environment via the $php_info associative
+# array.
+#
+# Authors:
+#   Taufek Johar <taufek@gmail.com>
+#
+
+local version
+
+# Clean up previous $php_info.
+unset php_info
+typeset -gA php_info
+
+if (( $+commands[php] )); then
+  version="${${$(php --version)[(w)1,(w)2]}/ /-}"
+fi
+
+# Format version.
+if [[ -n "$version" ]]; then
+  php_info[version]="$version"
+fi