Install xdebug-beta for php with version 7.3

Author: Stanislav Shupilkin

Dockerfile

@@ -4,10 +4,18 @@ ARG COMPOSER_VERSION=1.8
 FROM composer:${COMPOSER_VERSION}
 FROM php:${PHP_VERSION}-cli
 
+RUN set -eux; \
+    if [ $(php -r "echo PHP_MAJOR_VERSION.'.'.PHP_MINOR_VERSION;") = "7.3" ]; \
+    then \
+        pecl install xdebug-beta; \
+    else \
+        pecl install xdebug; \       
+    fi && \
+    docker-php-ext-enable xdebug
+
 RUN apt-get update && \
     apt-get install -y git zip unzip && \
-    pecl install mongodb && docker-php-ext-enable mongodb && \
-    pecl install xdebug && docker-php-ext-enable xdebug
+    pecl install mongodb && docker-php-ext-enable mongodb
 
 COPY --from=0 /usr/bin/composer /usr/local/bin/composer