1
|
|
|
<?php |
2
|
|
|
|
3
|
|
|
namespace WebPConvert\Helpers; |
4
|
|
|
|
5
|
|
|
/** |
6
|
|
|
* A fileExist function free of deception |
7
|
|
|
* |
8
|
|
|
* @package WebPConvert |
9
|
|
|
* @author Bjørn Rosell <[email protected]> |
10
|
|
|
* @since Class available since Release 2.3.0 |
11
|
|
|
*/ |
12
|
|
|
class FileExists |
13
|
|
|
{ |
14
|
|
|
|
15
|
|
|
private static $lastWarning; |
16
|
|
|
|
17
|
|
|
/** |
18
|
|
|
* A warning handler that registers that a warning has occured and suppresses it. |
19
|
|
|
* |
20
|
|
|
* @return void |
21
|
|
|
*/ |
22
|
1 |
|
public static function warningHandler($errno, $errstr, $errfile, $errline) |
|
|
|
|
23
|
|
|
{ |
24
|
1 |
|
self::$lastWarning = [$errstr, $errno]; |
25
|
|
|
|
26
|
|
|
// Suppress the warning by returning void |
27
|
1 |
|
return; |
28
|
|
|
} |
29
|
|
|
|
30
|
|
|
/** |
31
|
|
|
* A well behaved replacement for file_exist that throws upon failure rather than emmitting a warning. |
32
|
|
|
* |
33
|
|
|
* @throws \Exception If file_exists threw a warning |
34
|
|
|
* @return boolean|null True if file exists. False if it doesn't. |
35
|
|
|
*/ |
36
|
1 |
|
public static function honestFileExists($path) |
37
|
|
|
{ |
38
|
|
|
// There is a challenges here: |
39
|
|
|
// We want to suppress warnings, but at the same time we want to know that it happened. |
40
|
|
|
// We achieve this by registering an error handler |
41
|
1 |
|
$previousErrorHandler = set_error_handler( |
|
|
|
|
42
|
1 |
|
array('WebPConvert\Helpers\FileExists', "warningHandler"), |
43
|
1 |
|
E_WARNING | E_USER_WARNING | E_NOTICE | E_USER_NOTICE |
44
|
|
|
); |
45
|
1 |
|
self::$lastWarning = null; |
46
|
1 |
|
$found = @file_exists($path); |
47
|
|
|
|
48
|
|
|
// restore previous error handler immediately |
49
|
1 |
|
restore_error_handler(); |
50
|
|
|
|
51
|
|
|
// If file_exists returns true, we can rely on there being a file there |
52
|
1 |
|
if ($found) { |
53
|
1 |
|
return true; |
54
|
|
|
} |
55
|
|
|
|
56
|
|
|
// file_exists returned false. |
57
|
|
|
// this result is only trustworthy if no warning was emitted. |
58
|
1 |
|
if (is_null(self::$lastWarning)) { |
|
|
|
|
59
|
1 |
|
return false; |
60
|
|
|
} |
61
|
|
|
|
62
|
1 |
|
list($errstr, $errno) = self::$lastWarning; |
63
|
1 |
|
throw new \Exception($errstr, $errno); |
64
|
|
|
} |
65
|
|
|
|
66
|
|
|
/** |
67
|
|
|
* A fileExist based on an exec call. |
68
|
|
|
* |
69
|
|
|
* @throws \Exception If exec cannot be called |
70
|
|
|
* @return boolean|null True if file exists. False if it doesn't. |
71
|
|
|
*/ |
72
|
1 |
|
public static function fileExistsUsingExec($path) |
73
|
|
|
{ |
74
|
1 |
|
if (!function_exists('exec')) { |
75
|
|
|
throw new \Exception( |
76
|
|
|
'cannot determine if file exists using exec() - the function is unavailable' |
77
|
|
|
); |
78
|
|
|
} |
79
|
|
|
|
80
|
|
|
// Lets try to find out by executing "ls path/to/cwebp" |
81
|
1 |
|
exec('ls ' . $path, $output, $returnCode); |
82
|
1 |
|
if (($returnCode == 0) && (isset($output[0]))) { |
83
|
1 |
|
return true; |
84
|
|
|
} |
85
|
|
|
|
86
|
|
|
// We assume that "ls" command is general available! |
87
|
|
|
// As that failed, we can conclude the file does not exist. |
88
|
1 |
|
return false; |
89
|
|
|
} |
90
|
|
|
|
91
|
|
|
/** |
92
|
|
|
* A fileExist doing the best it can. |
93
|
|
|
* |
94
|
|
|
* @throws \Exception If it cannot be determined if the file exists |
95
|
|
|
* @return boolean|null True if file exists. False if it doesn't. |
96
|
|
|
*/ |
97
|
|
|
public static function fileExistsTryHarder($path) |
98
|
|
|
{ |
99
|
|
|
try { |
100
|
|
|
$result = self::honestFileExists($path); |
101
|
|
|
} catch (\Exception $e) { |
102
|
|
|
try { |
103
|
|
|
$result = self::fileExistsUsingExec($path); |
104
|
|
|
} catch (\Exception $e) { |
105
|
|
|
throw new \Exception('Cannot determine if file exists or not'); |
106
|
|
|
} |
107
|
|
|
} |
108
|
|
|
return $result; |
109
|
|
|
} |
110
|
|
|
} |
111
|
|
|
|
This check looks for parameters that have been defined for a function or method, but which are not used in the method body.