1 | <?php |
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2 | |||
3 | namespace LeKoala\DevToolkit\Helpers; |
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4 | |||
5 | use RecursiveIteratorIterator; |
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6 | use RecursiveDirectoryIterator; |
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7 | |||
8 | class FileHelper |
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9 | { |
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10 | /** |
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11 | * Slightly modified version of http://www.geekality.net/2011/05/28/php-tail-tackling-large-files/ |
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12 | * @author Torleif Berger, Lorenzo Stanco |
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13 | * @link http://stackoverflow.com/a/15025877/995958 |
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14 | * @license http://creativecommons.org/licenses/by/3.0/ |
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15 | */ |
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16 | public static function tail($filepath, $lines = 1, $adaptive = true) |
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17 | { |
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18 | // Open file |
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19 | $f = @fopen($filepath, "rb"); |
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20 | if ($f === false) { |
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21 | return false; |
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22 | } |
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23 | |||
24 | // Sets buffer size, according to the number of lines to retrieve. |
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25 | // This gives a performance boost when reading a few lines from the file. |
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26 | if (!$adaptive) { |
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27 | $buffer = 4096; |
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28 | } else { |
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29 | $buffer = ($lines < 2 ? 64 : ($lines < 10 ? 512 : 4096)); |
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30 | } |
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31 | // Jump to last character |
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32 | fseek($f, -1, SEEK_END); |
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33 | // Read it and adjust line number if necessary |
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34 | // (Otherwise the result would be wrong if file doesn't end with a blank line) |
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35 | if (fread($f, 1) != "\n") { |
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36 | $lines -= 1; |
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37 | } |
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38 | |||
39 | // Start reading |
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40 | $output = ''; |
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41 | $chunk = ''; |
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42 | // While we would like more |
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43 | while (ftell($f) > 0 && $lines >= 0) { |
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44 | // Figure out how far back we should jump |
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45 | $seek = min(ftell($f), $buffer); |
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46 | // Do the jump (backwards, relative to where we are) |
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47 | fseek($f, -$seek, SEEK_CUR); |
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48 | // Read a chunk and prepend it to our output |
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49 | $output = ($chunk = fread($f, $seek)) . $output; |
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50 | // Jump back to where we started reading |
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51 | fseek($f, -mb_strlen($chunk, '8bit'), SEEK_CUR); |
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52 | // Decrease our line counter |
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53 | $lines -= substr_count($chunk, "\n"); |
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54 | } |
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55 | // While we have too many lines |
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56 | // (Because of buffer size we might have read too many) |
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57 | while ($lines++ < 0) { |
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58 | // Find first newline and remove all text before that |
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59 | $output = substr($output, strpos($output, "\n") + 1); |
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60 | } |
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61 | // Close file and return |
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62 | fclose($f); |
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63 | return trim($output); |
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64 | } |
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65 | |||
66 | /** |
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67 | * Recursively remove a dir |
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68 | * |
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69 | * @param string $dir |
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70 | * @return bool |
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71 | */ |
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72 | public static function rmDir($dir) |
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73 | { |
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74 | if (!is_dir($dir)) { |
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75 | return false; |
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76 | } |
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77 | $it = new RecursiveDirectoryIterator($dir, RecursiveDirectoryIterator::SKIP_DOTS); |
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78 | $files = new RecursiveIteratorIterator($it, RecursiveIteratorIterator::CHILD_FIRST); |
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79 | foreach ($files as $file) { |
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80 | if ($file->isDir()) { |
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81 | rmdir($file->getRealPath()); |
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82 | } else { |
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83 | unlink($file->getRealPath()); |
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84 | } |
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85 | } |
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86 | return rmdir($dir); |
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87 | } |
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88 | |||
89 | /** |
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90 | * Check if a directory contains children |
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91 | * |
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92 | * @link https://stackoverflow.com/questions/6786014/php-fastest-way-to-find-if-directory-has-children |
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93 | * @param string $dir |
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94 | * @return bool |
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95 | */ |
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96 | public static function dirContainsChildren($dir) |
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97 | { |
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98 | $result = false; |
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99 | if ($dh = opendir($dir)) { |
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100 | while (!$result && ($file = readdir($dh)) !== false) { |
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101 | $result = $file !== "." && $file !== ".."; |
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102 | } |
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103 | closedir($dh); |
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104 | } |
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105 | return $result; |
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106 | } |
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107 | |||
108 | /** |
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109 | * @link https://www.digitalocean.com/community/questions/proper-permissions-for-web-server-s-directory |
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110 | * @param string $dir |
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111 | * @return bool |
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112 | */ |
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113 | public static function ensureDir($dir) |
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114 | { |
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115 | if (!is_dir($dir)) { |
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116 | return mkdir($dir, 0755, true); |
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117 | } |
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118 | return true; |
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119 | } |
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120 | |||
121 | /** |
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122 | * @param int $bytes |
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123 | * @param integer $decimals |
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124 | * @return string |
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125 | */ |
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126 | public static function humanFilesize($bytes, $decimals = 2) |
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127 | { |
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128 | if ($bytes < 1024) { |
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129 | return $bytes . ' B'; |
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130 | } |
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131 | $factor = floor(log($bytes, 1024)); |
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132 | return sprintf("%.{$decimals}f ", $bytes / pow(1024, $factor)) . ['B', 'KB', 'MB', 'GB', 'TB', 'PB'][$factor]; |
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133 | } |
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134 | } |
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135 |