strtok warns in case the string to split was not set.

Close GH-10016.

NEWS

@@ -99,6 +99,8 @@ PHP                                                                        NEWS
 - Standard:
   . E_NOTICEs emitted by unserialize() have been promoted to E_WARNING. (timwolla)
   . Make array_pad's $length warning less confusing. (nielsdos)
+  . E_WARNING emitted by strtok in the caase both arguments are not provided when
+    starting tokenisation. (David Carlier)
 
 - Streams:
   . Fixed bug #51056: blocking fread() will block even if data is available.

UPGRADING

@@ -68,6 +68,7 @@ PHP 8.3 UPGRADE NOTES
   . array_pad() is now only limited by the maximum number of elements an array
     can have. Before, it was only possible to add at most 1048576 elements at a
     time.
+  . strtok() raises a warninin the case token is not provided when starting tokenization.
 
 ========================================
 6. New Functions

ext/standard/string.c

@@ -1080,7 +1080,7 @@ PHP_FUNCTION(strtok)
 
 	if (!BG(strtok_string)) {
 		/* String to tokenize not set. */
-		// TODO: Should this warn?
+		php_error_docref(NULL, E_WARNING, "Both arguments must be provided when starting tokenization");
 		RETURN_FALSE;
 	}
 

ext/standard/tests/strings/strtok_variation3.phpt

@@ -62,7 +62,7 @@ foreach($heredoc_strings as $string)  {
 
 echo "Done\n";
 ?>
---EXPECT--
+--EXPECTF--
 *** Testing strtok() : with heredoc strings ***
 
 --- Iteration 1 ---
@@ -80,15 +80,35 @@ bool(false)
 
 --- Iteration 2 ---
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
 
 --- Iteration 3 ---
@@ -137,9 +157,19 @@ string(3) "rld"
 string(4) "hell"
 string(4) "hell"
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
 Done

ext/standard/tests/strings/strtok_variation4.phpt

@@ -36,15 +36,25 @@ foreach( $strings_with_nulls as $string )  {
 
 echo "Done\n";
 ?>
---EXPECT--
+--EXPECTF--
 *** Testing strtok() : with embedded nulls in the strings ***
 
 --- Iteration 1 ---
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
 
 --- Iteration 2 ---
@@ -82,9 +92,17 @@ bool(false)
 --- Iteration 6 ---
 string(11) "hello	world"
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
 
 --- Iteration 7 ---

ext/standard/tests/strings/strtok_variation5.phpt

@@ -52,7 +52,7 @@ foreach( $string_array as $string )  {
 
 echo "Done\n";
 ?>
---EXPECT--
+--EXPECTF--
 *** Testing strtok() : with miscellaneous inputs ***
 
 --- Iteration 1 ---
@@ -65,10 +65,20 @@ bool(false)
 
 --- Iteration 2 ---
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
 
 --- Iteration 3 ---
@@ -113,18 +123,38 @@ bool(false)
 
 --- Iteration 8 ---
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
 
 --- Iteration 9 ---
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
 
 --- Iteration 10 ---

ext/standard/tests/strings/strtok_variation6.phpt

@@ -42,7 +42,7 @@ foreach( $string_array as $string )  {
 
 echo "Done\n";
 ?>
---EXPECT--
+--EXPECTF--
 *** Testing strtok() : with invalid escape sequences in token ***
 
 --- Iteration 1 ---
@@ -69,6 +69,8 @@ bool(false)
 string(1) " "
 string(1) "r"
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
 
 
@@ -91,11 +93,15 @@ bool(false)
 string(5) "hello"
 string(6) " world"
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
 
 string(1) " "
 string(1) "r"
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
 
 
@@ -113,6 +119,8 @@ bool(false)
 string(6) "hello\"
 string(6) " world"
 bool(false)
+
+Warning: strtok(): Both arguments must be provided when starting tokenization in %s on line %d
 bool(false)
 
 string(1) "/"