http://www.sharkpp.net/blog/2016/05/28/compare-format-for-date-to-string-php-and-ruby.html 用のスクリプト(メイン)

_format-diff.php

<?php

// The MIT License (MIT)
// Copyright (c) 2016 sharkpp.
// See: https://opensource.org/licenses/mit-license.php

// usage: _format-diff.php
//
// 実行するスクリプトの仕様
// 1. １番目の引数に UNIX 時刻を指定された場合にその値を利用し書式化すること
// 2. 出力フォーマットは "フォーマット@@値@~" を１単位とする
// 3. それぞのたんの出力ごとに改行文字は付与しないこと

function array_search_callback($cb, array $haystack)
{
    foreach ($haystack as $key => $value)
    {
        if ($cb($value)) {
            return $key;
        }
    }
    return FALSE;
}

ini_set('date.timezone', 'Asia/Tokyo');

$tbls = [];

// テストするコマンドの一覧
$cmds = [
    'php php-strftime.php',
    'php php-date.php',
    'ruby ruby-Time#strftime.rb',
];

for ($timestamp = mktime(23, 45, 57,12,30, 2012),
     $timestamp_last = mktime(23, 45, 57, 2, 8, 2013); 
     //$timestamp_last = mktime(23, 45, 57, 1, 2, 2013); 
     $timestamp <= $timestamp_last; $timestamp += 1234)
{

    foreach ($cmds as $cmd) {
        $tblkey = array_search_callback(function ($v) use ($cmd) {
                return $v['cmd'] === $cmd;
            }, $tbls);
        $fmts = false === $tblkey ? [] : $tbls[$tblkey]['fmts'];
        // コマンドの結果を取得
        ob_start();
        passthru($cmd . ' ' . $timestamp);
        $tmp = ob_get_clean();
        ob_end_clean();
        // 行を分解 ※改行文字はない
        // |   :
        // |フォーマット@@値@~
        // |   :
        foreach (explode("@~", $tmp) as $line) {
            if (empty($line))
                continue;
            $tmp2 = [ 'fmt' => '', 'value' => '', 'used' => 0 ];
            list($tmp2['fmt'], $tmp2['value']) = explode("@@", $line);
            $key = array_search_callback(function ($v) use ($tmp2) {
                    return $v['fmt'] === $tmp2['fmt'];
                }, $fmts);
            if (false !== $key) {
                $fmts[$key]['value'] .= "\x7F" . $tmp2['value'];
            }
            else {
                $fmts[] = $tmp2;
            }
        }
        if (false !== $tblkey) {
            $tbls[$tblkey]['fmts'] = $fmts;
        }
        else {
           $tbls[] = [ 'cmd' => $cmd, 'fmts' => $fmts ];
        }

    }
}
//print_r($tbls);

$results = [];

$diff_init = array_combine($cmds, array_fill(0, count($cmds), []));
$diff = [];
foreach ($tbls as $i => $tbl)
{
    foreach ($tbl['fmts'] as $j => $fmt)
	{
        if (!isset($diff[ $fmt['value'] ])) {
            $diff[ $fmt['value'] ] = $diff_init;
        }
        $diff[ $fmt['value'] ][ $tbl['cmd'] ][] = $fmt['fmt'];
    }
}
foreach ($diff as $diff_key => $diff_value)
{
    $tmp = [];
    foreach ($diff_value as $cmd => $value) {
        $tmp[$cmd] = implode(', ', $value);
    }
    $results[] = $tmp;
}

// カラムの幅を計算
$width = array_combine($cmds, array_fill(0, count($cmds), 5));
for ($i = 0; $i < count($results); $i++) {
	foreach ($cmds as $cmd) {
        $width[$cmd] = max($width[$cmd], strlen($results[$i][$cmd]));
	}
}

//print_r($results);

// 結果を Markdown の表形式で出力

// ヘッダを出力
echo '|';
foreach ($cmds as $cmd) {
	echo preg_replace('/.+? ([^-]+)-([^.]+)\..+/', '$1:$2', $cmd) . '|';
}
echo '説明|'.PHP_EOL;
echo '|'.implode('|', array_fill(0, count($cmds), ':-:')).'|-|'.PHP_EOL;

// 結果を出力
for ($i = 0; $i < count($results); $i++) {
	echo '|';
	foreach ($cmds as $cmd)
	{
		echo str_pad($results[$i][$cmd], $width[$cmd], ' ', STR_PAD_BOTH) . '|';
	}
	echo '|';
	echo PHP_EOL;
}
echo PHP_EOL;
//echo $timestamp. PHP_EOL;