add error for unsupported php in phpunit test script

4dev/checking/phpunit.sh

@@ -2,6 +2,7 @@ base="/storage/var/www/html/developers/clemens/core_data/php_libraries/trunk/";
 # -c phpunit.xml
 # --testdox
 # call with "t" to give verbose testdox output
+# SUPPORTED: https://www.php.net/supported-versions.php
 # call with 7.3, 7.4, 8.0, 8.1 to force a certain php version
 
 opt_testdox="";
@@ -10,17 +11,19 @@ if [ "${1}" = "t" ] || [ "${2}" = "t" ]; then
 fi;
 php_bin="";
 case "${1}" in
-	"7.3") php_bin="/usr/bin/php7.3 "; ;;
+	# "7.3") php_bin="/usr/bin/php7.3 "; ;;
 	"7.4") php_bin="/usr/bin/php7.4 "; ;;
 	"8.0") php_bin="/usr/bin/php8.0 "; ;;
 	"8.1") php_bin="/usr/bin/php8.1 "; ;;
+	*) echo "Not support PHP: ${1}"; exit; ;;
 esac;
 if [ -z "${php_bin}" ]; then
 	case "${2}" in
-		"7.3") php_bin="/usr/bin/php7.3 "; ;;
+		# "7.3") php_bin="/usr/bin/php7.3 "; ;;
 		"7.4") php_bin="/usr/bin/php7.4 "; ;;
 		"8.0") php_bin="/usr/bin/php8.0 "; ;;
 		"8.1") php_bin="/usr/bin/php8.1 "; ;;
+		*) echo "Not support PHP: ${1}"; exit; ;;
 	esac;
 fi;