test.php

<?php

$cacheDir = sys_get_temp_dir();
echo 'Cache Dir: ' . $cacheDir . '<br />';

$newCacheDir = $cacheDir . DIRECTORY_SEPARATOR . 'cache';
echo 'New Cache Dir: ' . $newCacheDir . '<br />';

if (!is_dir($newCacheDir)) {
    mkdir($newCacheDir, 0777);
}

if (is_dir($newCacheDir)) {
    echo 'Cache dir: ' . $newCacheDir . ' has been created. '  . '<br />';
}

$otherCacheDir = $newCacheDir . DIRECTORY_SEPARATOR . 'tmp';
if (!is_dir($otherCacheDir)) {
    $res = mkdir($otherCacheDir, 0777);
    var_dump($res);
}

file_put_contents($otherCacheDir . '/fileexample.txt', 'Some data...');
echo file_get_contents($otherCacheDir . '/fileexample.txt') . '<br />';


$recursiveDir = $cacheDir . '/my/cache/example';
if (!is_dir($recursiveDir)) {
    $res = mkdir($recursiveDir, 0777, true);
    var_dump($res);
}

file_put_contents($recursiveDir . '/fileexample.txt', 'Some data in recursive dir...');
echo file_get_contents($recursiveDir . '/fileexample.txt') . '<br />';