ext/spl: Fix default argument handling for named parameters in SplFileObject::fgetcsv()

Author: arshidkv12

ext/spl/spl_directory.c

@@ -2268,7 +2268,9 @@ PHP_METHOD(SplFileObject, fgetcsv)
 			zend_argument_value_error(1, "must be a single character");
 			RETURN_THROWS();
 		}
-		delimiter = delim[0];
+		if(delim[0] != ',') {
+			delimiter = delim[0];
+		}
 	}
 	if (enclo) {
 		if (e_len != 1) {

ext/spl/tests/gh22156.phpt

@@ -0,0 +1,28 @@
+--TEST--
+Bug GH-22156 SplFileObject::fgetcsv() with named escape parameter
+--FILE--
+<?php
+
+$file = new SplFileObject('php://memory', 'rw+');
+
+$file->fwrite("foo;bar;baz");
+$file->seek(0);
+
+$file->setCsvControl(';', "\n", "\\");
+
+while (!$file->eof()) {
+    $line = $file->fgetcsv(escape: '\\');
+    var_dump($line);
+}
+
+?>
+--EXPECT--
+array(3) {
+  [0]=>
+  string(3) "foo"
+  [1]=>
+  string(3) "bar"
+  [2]=>
+  string(3) "baz"
+}
+