diff --git a/Dockerfile b/Dockerfile
index 4fd172e5..8334b9e3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -399,8 +399,8 @@ RUN wget --tries=5 -q -O /etc/apk/keys/sgerrand.rsa.pub https://alpine-pkgs.sger
     git git-lfs \
     glibc-${GLIBC_VERSION}.apk \
     gnupg \
-    php7 php7-phar php7-json php7-mbstring php-xmlwriter \
-    php7-tokenizer php7-ctype php7-curl php7-dom php7-simplexml \
+    php7 php7-curl php7-ctype php7-dom php7-iconv php7-json php7-mbstring \
+    php7-openssl php7-phar php7-simplexml php7-tokenizer php-xmlwriter \
     && rm glibc-${GLIBC_VERSION}.apk \
     && wget -q --tries=5 -O /tmp/libz.tar.xz https://www.archlinux.org/packages/core/x86_64/zlib/download \
     && mkdir /tmp/libz \
@@ -437,6 +437,11 @@ COPY --from=base_image /home/r-library /home/r-library
 COPY --from=base_image /root/.tflint.d/ /root/.tflint.d/
 COPY --from=clang-format-build /tmp/llvm-project/llvm/build/bin/clang-format /usr/bin/clang-format
 
+####################################################
+# Install Composer after all Libs have been copied #
+####################################################
+RUN sh -c 'curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/bin --filename=composer'
+
 ########################################
 # Add node packages to path and dotnet #
 ########################################
diff --git a/Dockerfile-slim b/Dockerfile-slim
index 0b46f716..d4c8332d 100644
--- a/Dockerfile-slim
+++ b/Dockerfile-slim
@@ -336,8 +336,8 @@ RUN wget --tries=5 -q -O /etc/apk/keys/sgerrand.rsa.pub https://alpine-pkgs.sger
     git git-lfs \
     glibc-${GLIBC_VERSION}.apk \
     gnupg \
-    php7 php7-phar php7-json php7-mbstring php-xmlwriter \
-    php7-tokenizer php7-ctype php7-curl php7-dom php7-simplexml \
+    php7 php7-curl php7-ctype php7-dom php7-iconv php7-json php7-mbstring \
+    php7-openssl php7-phar php7-simplexml php7-tokenizer php-xmlwriter \
     && rm glibc-${GLIBC_VERSION}.apk \
     && wget -q --tries=5 -O /tmp/libz.tar.xz https://www.archlinux.org/packages/core/x86_64/zlib/download \
     && mkdir /tmp/libz \
@@ -373,6 +373,11 @@ COPY --from=base_image /home/r-library /home/r-library
 COPY --from=base_image /root/.tflint.d/ /root/.tflint.d/
 COPY --from=clang-format-build /tmp/llvm-project/llvm/build/bin/clang-format /usr/bin/clang-format
 
+####################################################
+# Install Composer after all Libs have been copied #
+####################################################
+RUN sh -c 'curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/bin --filename=composer'
+
 ########################################
 # Add node packages to path and dotnet #
 ########################################
diff --git a/lib/functions/detectFiles.sh b/lib/functions/detectFiles.sh
index 813bfea1..b61be320 100755
--- a/lib/functions/detectFiles.sh
+++ b/lib/functions/detectFiles.sh
@@ -394,3 +394,47 @@ function IsGenerated() {
     return 0
   fi
 }
+################################################################################
+#### Function RunAdditionalInstalls ############################################
+function RunAdditionalInstalls() {
+  ##################################
+  # Run installs for Psalm and PHP #
+  ##################################
+  if [ "${VALIDATE_PHP_PSALM}" == "true" ] && [ "${#FILE_ARRAY_PHP_PSALM[@]}" -ne 0 ]; then
+    # found PHP files and were validating it, need to composer install
+    info "Found PHP files to validate, and [VALIDATE_PHP_PSALM] set to true, need to run composer install"
+    info "looking for composer.json in the users repository..."
+    mapfile -t COMPOSER_FILE_ARRAY < <(find / -name composer.json 2>&1)
+    debug "COMPOSER_FILE_ARRAY contents: ${COMPOSER_FILE_ARRAY[*]}"
+    ############################################
+    # Check if we found the file in the system #
+    ############################################
+    if [ "${#COMPOSER_FILE_ARRAY[@]}" -ne 0 ]; then
+      for LINE in "${COMPOSER_FILE_ARRAY[@]}"; do
+        PATH=$(dirname "${LINE}" 2>&1)
+        info "Found [composer.json] at:[${LINE}]"
+        COMPOSER_CMD=$(
+          cd "${PATH}" || exit 1
+          composer install 2>&1
+        )
+
+        ##############
+        # Error code #
+        ##############
+        ERROR_CODE=$?
+
+        ##############################
+        # Check the shell for errors #
+        ##############################
+        if [ "${ERROR_CODE}" -ne 0 ]; then
+          # Error
+          error "ERROR! Failed to run composer install at location:[${PATH}]"
+          fatal "ERROR:[${COMPOSER_CMD}]"
+        else
+          # Success
+          info "Successfully ran:[composer install] for PHP validation"
+        fi
+      done
+    fi
+  fi
+}
diff --git a/lib/linter.sh b/lib/linter.sh
index 97d92b77..59c24ff3 100755
--- a/lib/linter.sh
+++ b/lib/linter.sh
@@ -914,6 +914,11 @@ CheckSSLCert
 ###########################################
 BuildFileList "${VALIDATE_ALL_CODEBASE}" "${TEST_CASE_RUN}" "${ANSIBLE_DIRECTORY}"
 
+#####################################
+# Run additional Installs as needed #
+#####################################
+RunAdditionalInstalls
+
 ###############
 # Run linters #
 ###############