SPL File and directory

directory.php

$dir = new DirectoryIterator('common/images');
foreach($dir as $key => $file) {
    if ($file->isFile()) {
//        echo $key . ': ' . $file->getFilename() . '<br / >';
        $files[] = clone $file; // 必须colne不然无法存入数组
    }
}
echo $files[1]->getFilename();;

DirectoryIterator.md

DirectoryIterator

• include dot files
• numbered keys
• Path not included in value
• no configuration options
• array requires cloned objects

FilesystemIterator

• Dot files skipped
• pathname used for key
• Path included key
• configurable
• clone not necessary

File and Directory permissions

• isDir() determines if the file is a directory
• isFile() determines if the file is a file
• isReadable()
• isWritable()
• isExecutable()

Filename and path

• getFilename()
• getPath()
• getPathname()
• getRealPath()
• getPathInfo()

File statistics and type

• getSize()
• getATime()
• getMTime()
• getExtension()
• getType() return file,dir,link

Access file Content

• openFile() create a File Object

download_csv.php

<?php
$rates = [
    ['currency' => 'Australia $', 'rate' => 0.93630],
    ['currency' => 'Canada $', 'rate' => 0.92060],
    ['currency' => 'Euro', 'rate' => 1.35630],
    ['currency' => 'Hong Kong $', 'rate' => 0.12900],
    ['currency' => 'Japan yen', 'rate' => 0.00980],
    ['currency' => 'Swiss franc', 'rate' => 1.11300],
    ['currency' => 'UK sterling', 'rate' => 1.69700]
];

if (isset($_POST['download'])) {
    $titles = array_keys($rates[0]);
    $file = new SplTempFileObject();
    $file->fputcsv($titles);
    foreach ($rates as $rate) {
        $file->fputcsv($rate);
    }
    $file->rewind();
    header('Content-Type: text/csv');
    header('Content-Disposition: attachment;filename=rates.csv');
    $file->fpassthru();
    exit;
}

fileinfo.php

<?php

$files = new FilesystemIterator('common/images', FilesystemIterator::UNIX_PATHS);

foreach ($files as $file) {
    if ($file->getExtension() == 'jpg') {
        echo $file->getFilename() . ' is ' . $file->getSize() . ' bytes. ' . ' Its absolute path is: ' . $file->getRealpath() . '<br />';
    }
}

fileobject_csv.php

<?php

$csvfile = new SplFileObject('common/data/cars_tab.csv');

$csvfile->setFlags(SplFileObject::READ_CSV);
$csvfile->setCsvControl("\t");

foreach ($csvfile as $line) {
    $cars[] = $line;
}

echo '<pre>';
print_r($cars);
echo '</pre>';

fileoject.php

<?php

$docs = new FilesystemIterator('common/documents', FilesystemIterator::UNIX_PATHS);

foreach ($docs as $doc) {
    if ($doc->getExtension() == 'txt') {
        $textfile = $doc->openFile('r+');
        $textfile->setFlags(SplFileObject::SKIP_EMPTY |
            SplFileObject::READ_AHEAD |
            SplFileObject::DROP_NEW_LINE);
        echo '<h2>' . $textfile->getFilename() . '</h2>';
        foreach ($textfile as $line) {
            echo "$line<br />";
        }
        $textfile->seek(3);
        echo '<br />';
        echo 'This is the fourth line: ' . $textfile;

        while (! $textfile->eof()) {
            $textfile->next();
        }
        $textfile->fwrite("\r\n\r\nThis line was added");
    }
}

Filesystem.php

<?php

//$dir = new FilesystemIterator('common/images', FilesystemIterator::UNIX_PATHS);
$dir = new FilesystemIterator('common/images');
$dir->setFlags(FilesystemIterator::UNIX_PATHS | FilesystemIterator::KEY_AS_FILENAME);
foreach ($dir as $key => $file) {
//    echo $key . '>> ' . $file . '<br />';
    $files[] = $file;
}

var_dump($files[2]->getFilename());

recursive_directory.php

<?php

$files = new RecursiveDirectoryIterator('common');
$files->setFlags(FilesystemIterator::SKIP_DOTS | FilesystemIterator::UNIX_PATHS);
$files = new RecursiveIteratorIterator($files, RecursiveIteratorIterator::SELF_FIRST);
$files->setMaxDepth(1);
foreach ($files as $file) {
    echo $file . '<br />';
}