<?php
function micro($func, $file) {
    $max = 1000000;
    if ( is_dir($file) ) {
        $start = microtime(1);
        for ( $i = 0; $i < $max; ++$i )
            $func($file.$i);
        $end = microtime(1);
    } else {
        $start = microtime(1);
        for ( $i = 0; $i < $max; ++$i )
            $func($file);
        $end = microtime(1);
    }
    clearstatcache(true);
    return $end - $start;
}

function bench_file($file) {
    return array(
        'is_file'
                => micro('is_file', $file),
        'is_file (chemins absolus)'
                => micro('is_file', getcwd().'/'.$file),
        'file_exists'
                => micro('file_exists', $file),
        'file_exists (chemins absolus)'
                => micro('file_exists', getcwd().'/'.$file),
        'stream_resolve_include_path'
                => micro('stream_resolve_include_path', $file),
        'stream_resolve_include_path (chemins absolus)'
                => micro('stream_resolve_include_path', getcwd().'/'.$file),
    );
}

function print_res($res) {
    $ret = '';
    foreach ( $res as $key => $value ) {
        $ret .= sprintf("%f %s\n", $value, $key);
    }
    return $ret;
}

function print_avg($res1, $res2) {
    $ret = '';
    foreach ( $res1 as $key => $value ) {
        $ret .= sprintf("%f %s\n", (($value + $res2[$key]) / 2.0), $key);
    }
    return $ret;
}

$tests = array(
    bench_file('test/'),  // test/0, test/1, ..., test/999999
    bench_file('test2/'), // test2 existe et ne contient aucun fichier
    bench_file('README.txt'),  // existe
    bench_file('README.unk'),  // n'existe pas
);

echo
    "// -- Dossier contenant plusieurs fichiers --\n",
    "// Existants :\n", print_res($tests[0]),
    "// Inexistants :\n", print_res($tests[1]),
    "// Moyennes :\n", print_avg($tests[0], $tests[1]),
    "\n",
    "// -- Même fichier --\n",
    "// Existant :\n",  print_res($tests[2]),
    "// Inexistant :\n", print_res($tests[3]),
    "// Moyennes :\n", print_avg($tests[2], $tests[3]);
?>