PHP > file

permission.php

// ファイルの権限(パーミッション)を表示する
<?php
$data = array(
    'file' => 'sample.txt',
);

if (file_exists($data['file'])) {
    $data['exists'] = 'exists';
} else {
    $data['exists'] = 'no exists';
}

if (is_readable($data['file'])) {
    $data['readable'] = 'readable';
} else {
    $data['readable'] = 'no readable';
}

if (is_writable($data['file'])) {
    $data['writable'] = 'writable';
} else {
    $data['writable'] = 'no writable';
}

if (is_executable($data['file'])) {
    $data['execute'] = 'executable';
} else {
    $data['execute'] = 'no executable';
}

var_dump($data);

sample.txt

[ 1347425170.002]
[ 1347425190.361]
[ 1347425207.422]

write.php

<?php
$filename = 'sample.txt';

if (file_exists($filename) && !is_writable($filename)
    || !is_writable(dirname($filename))) {
        echo "Error";
}
$fp = fopen($filename, 'a') or dir('ファイルを開けません');

fwrite($fp, sprintf("[%' 15.3f]" . "\n", microtime(true)));

fclose($fp);