sqlite-object-cache / includes / lib / class-file.php

class-file.php in SQLite Object Cache 1.5.5, at includes/lib/class-file.php

75 lines 1.7 KB

Raw Download Zip

1	<?php
2	if ( ! defined( 'ABSPATH' ) ) {
3	exit;
4	}
5	/**
6	* Read and write an existing file.
7	*/
8	class SQLite_Object_Cache_File {
9
10	/**
11	* Read data from file.
12	*
13	* @param string $filename The pathname of the file to read.
14	*
15	* @return bool\|string The file's contents. Empty string if the file doesn't already exist. false if it is not readable.
16	*/
17	public static function read( $filename ) {
18	if ( ! file_exists( $filename ) ) {
19	return '';
20	}
21
22	if ( ! is_readable( $filename ) ) {
23	return false;
24	}
25
26	$content = file_get_contents( $filename );
27	return self::remove_zero_space( $content );
28	}
29
30	/**
31	* Save data to file.
32	*
33	* @param string $filename
34	* @param string $data
35	*
36	* @return bool True if the save succeeded.
37	*/
38	public static function save( $filename, $data ) {
39
40	if ( ! file_exists( $filename ) ) {
41	return false;
42	}
43	$data = self::remove_zero_space( $data );
44	$ret = file_put_contents( $filename, $data, LOCK_EX );
45
46	return ( false !== $ret );
47	}
48
49	/**
50	* Remove Unicode zero-width spaced <200b><200c> and BOMs
51	*
52	* @param array\|string $content
53	*
54	* @return array\|string\|string[]
55	*/
56	public static function remove_zero_space( $content ) {
57	if ( is_array( $content ) ) {
58	$content = array_map( __CLASS__ . '::remove_zero_space', $content );
59	return $content;
60	}
61
62	// Remove UTF-8 BOM if present
63	if ( substr( $content, 0, 3 ) === "\xEF\xBB\xBF" ) {
64	$content = substr( $content, 3 );
65	}
66
67	$content = str_replace( "\xe2\x80\x8b", '', $content );
68	$content = str_replace( "\xe2\x80\x8c", '', $content );
69	$content = str_replace( "\xe2\x80\x8d", '', $content );
70
71	return $content;
72	}
73
74	}
75