Corrected typo in LimitIterator offset exception. Fixes #51119

ext/spl/spl_iterators.c

@@ -1272,7 +1272,7 @@ static spl_dual_it_object* spl_dual_it_construct(INTERNAL_FUNCTION_PARAMETERS, z
 				return NULL;
 			}
 			if (intern->u.limit.offset < 0) {
-				zend_throw_exception(spl_ce_OutOfRangeException, "Parameter offset must be > 0", 0 TSRMLS_CC);
+				zend_throw_exception(spl_ce_OutOfRangeException, "Parameter offset must be >= 0", 0 TSRMLS_CC);
 				zend_restore_error_handling(&error_handling TSRMLS_CC);
 				return NULL;
 			}

ext/spl/tests/bug51119.phpt

@@ -0,0 +1,34 @@
+--TEST--
+SPL: LimitIterator zero is valid offset
+--FILE--
+<?php
+
+$array = array('a', 'b', 'c');
+$arrayIterator = new ArrayIterator($array);
+
+try {
+  $limitIterator = new LimitIterator($arrayIterator, 0);
+  foreach ($limitIterator as $item) {
+    echo $item . "\n";
+  }
+} catch (OutOfRangeException $e){
+  print $e->getMessage() . "\n";
+}
+
+try {
+  $limitIterator = new LimitIterator($arrayIterator, -1);
+  foreach ($limitIterator as $item) {
+    echo $item . "\n";
+  }
+} catch (OutOfRangeException $e){
+  print $e->getMessage() . "\n";
+}
+
+?>
+===DONE===
+--EXPECT--
+a
+b
+c
+Parameter offset must be >= 0
+===DONE===

ext/spl/tests/spl_limit_iterator_check_limits.phpt

@@ -32,6 +32,6 @@ try {
 ?>
 ===DONE===
 --EXPECTF--
-Parameter offset must be > 0
+Parameter offset must be >= 0
 Parameter count must either be -1 or a value greater than or equal 0
 ===DONE===