--TEST--
is_*() and file_exists() return values are boolean.
--POST--
--GET--
--FILE--
<?php

$funcs = array(
	'is_writable',
	'is_readable',
	'is_executable',
	'is_file',
	'file_exists',
);

$filename="";

foreach ($funcs as $test) {
	$bb = $test($filename);
	echo gettype($bb)."\n";
	clearstatcache();
}

$filename="run-tests.php";

foreach ($funcs as $test) {
	$bb = $test($filename);
	echo gettype($bb)."\n";
	clearstatcache();
}

?>
--EXPECT--
boolean
boolean
boolean
boolean
boolean
boolean
boolean
boolean
boolean
boolean