tests: Fix tests affected by bool type juggling deprecation

Author: Girgias

tests/classes/iterators_008.phpt

@@ -10,7 +10,7 @@ class D extends C implements Iterator {
 
   public function valid(): bool {
     echo __METHOD__ . "($this->counter)\n";
-    return $this->counter;
+    return (bool)$this->counter;
   }
 
   public function next(): void {

tests/output/bug46897.phpt

@@ -8,7 +8,7 @@ function callback($string) {
     return "[callback:$callback_invocations]$string\n";
 }
 
-ob_start('callback', 0, false);
+ob_start('callback', 0, 0);
 
 echo "Attempt to flush unerasable buffer - should fail...";
 var_dump(ob_flush());

tests/output/ob_start_basic_unerasable_001.phpt

@@ -8,7 +8,7 @@ function callback($string) {
     return "[callback:$callback_invocations]$string\n";
 }
 
-ob_start('callback', 0, false);
+ob_start('callback', 0, 0);
 
 echo "This call will obtain the content:\n";
 $str = ob_get_contents();

tests/output/ob_start_basic_unerasable_002.phpt

@@ -8,7 +8,7 @@ function callback($string) {
     return "[callback:$callback_invocations]$string\n";
 }
 
-ob_start('callback', 0, false);
+ob_start('callback', 0, 0);
 
 echo "All of the following calls will fail to clean/remove the topmost buffer:\n";
 var_dump(ob_clean());

tests/output/ob_start_basic_unerasable_003.phpt

@@ -8,7 +8,7 @@ function callback($string) {
     return "[callback:$callback_invocations]$string\n";
 }
 
-ob_start('callback', 0, false);
+ob_start('callback', 0, 0);
 
 echo "This call will obtain the content, but will not clean the buffer.";
 $str = ob_get_clean();

tests/output/ob_start_basic_unerasable_004.phpt

@@ -8,7 +8,7 @@ function callback($string) {
     return "[callback:$callback_invocations]$string\n";
 }
 
-ob_start('callback', 0, false);
+ob_start('callback', 0, 0);
 
 echo "This call will obtain the content, but will not flush the buffer.";
 $str = ob_get_flush();

tests/output/ob_start_basic_unerasable_005.phpt

@@ -8,7 +8,7 @@ function callback($string) {
     return "[callback:$callback_invocations]$string\n";
 }
 
-ob_start('callback', 0, false);
+ob_start('callback', 0, 0);
 
 echo "Attempt to flush unerasable buffer - should fail...";
 var_dump(ob_flush());