since php-7.3.0 array_init() and array_init_size() are converted into macros
calling zend_new_array(). They are not functions anymore and don't return
any values.

this change was introduced in following commit:
https://github.com/php/php-src/commit/44e0b79ac64b344fc1335c126e548f00d8308602

--- cups-filters-1.21.4/scripting/php/phpcups.c	2018-11-24 19:42:09.905418408 +0100
+++ cups-filters-1.21.4.orig/scripting/php/phpcups.c	2018-11-24 19:40:21.903078482 +0100
@@ -297,7 +297,11 @@
     RETURN_NULL();
   }
 
+#if PHP_MAJOR_VERSION >= 7 && PHP_MINOR_VERSION >= 3
+  array_init(return_value);
+#else
   if (array_init(return_value) == SUCCESS)
+#endif
   {
     for (i = 0, dest = dests; i < num_dests; i ++, dest ++)
     {
@@ -329,7 +333,11 @@
         MAKE_STD_ZVAL(optionsobj);
 #endif
 
+#if PHP_MAJOR_VERSION >= 7 && PHP_MINOR_VERSION >= 3
+	array_init(optionsobj);
+#else
 	if (array_init(optionsobj) == SUCCESS)
+#endif
 	{
 	  for (j = 0, option = dest->options;
 	       j < dest->num_options;
@@ -383,7 +391,12 @@
     RETURN_NULL();
   }
 
+
+#if PHP_MAJOR_VERSION >= 7 && PHP_MINOR_VERSION >= 3
+  array_init(return_value);
+#else
   if (array_init(return_value) == SUCCESS)
+#endif
   {
     for (i = 0, job = jobs; i < num_jobs; i ++, job ++)
     {