<?php include_once 'ahash-common.inc.php'; define("PHOTO_PATH", "images"); $up_form = <<< EOS <h3>類似画像検索(Average Hash)</h3> <div style="border:1px solid silver;padding:12px"> JPEGファイルを選択してください。<br> <form enctype="multipart/form-data" method="POST"> <input name="upfile" type="file"><br> <input type="submit" value="アップロード"> </form></div> EOS; $head = '<html><meta charset="utf-8"><body>'; $foot = '</body></html>'; if(empty($_FILES['upfile']['tmp_name'])){ echo $head.$up_form.$foot; exit; } $upfile = dirname(__FILE__).'/upfile.jpg'; move_uploaded_file($_FILES['upfile']['tmp_name'], $upfile); $target = makeAHash($upfile, false); $files = enumJpeg(PHOTO_PATH); $result = checkHash($target, $files); $top6 = array_slice($result, 0, 6); echo $head; echo "<div style='text-align:center'><h2>アップした写真</h2>"; echo "<img src='upfile.jpg' width=300>"; echo "<h2>以下類似する順番に表示</h2>"; foreach($top6 as $f){ $path = $f['path']; $value = $f['value']; echo "<img src='path' width=300 alt='$value:$path'>"; } echo "</div>".$foot; // hashから類似度を算出 function checkHash($target, $files){ $list = []; foreach ($files as $file){ $hash = makeAHash($file); $match = 0; for ($i = 0; $i < strlen($target); $i++){ if (substr($target,$i,1) == substr($hash,$i,1)) $match++; } $list[] = [ "path" => $file, "value" => $match, ]; } usort($list, function ($a, $b){ return $b['value'] - $a['value']; }); return $list; }
average hashを作成
<?php // Average Hashを調べるライブラリ function makeAHash($file, $cache = TRUE){ $hashfile = preg_replace('/\.(jpg|jpeg)$/', '.hash', $file); if($cach) { if (file_exists($hashfile)){ $v = file_get_contents($hashfile); return $v; } } // (1) 16x16にリサイズ $sz = 16; $src = imagecreatefromjpeg($file); $sx = imagesx($src); $sy = imagesy($src); $des = imagecreatetruecolor($sz, $sz); imagecopyresized($des, $src, 0, 0, 0, 0, $sz, $sz, $sx, $sy); imagefilter($des, IMG_FILTER_GRAYSCALE); // (3)平均値を得つつ、配列に入れておく $pix = []; $sum = 0; for ($y = 0; $y < $sz; $y++){ for ($x = 0; $x < $sz; $x++){ $rgb = imagecolorat($des, $x, $y); $b = $rgb & 0xFF; $sum += $b; $pix[] = $b; } } $ave = floor($sum / ($sz * $sz)); // (4)2値化する $hash = ''; foreach ($pix as $i => $v){ $hash .= ($v >= $ave) ? '1' : '0'; if ($i % 16 == 15) $hash .= "\n"; } } function enumJpeg($path){ $files = []; $fs = scandir($path); foreach ($fs as $f){ if (substr($f, 0, 1) == ".") continue; $fullpath = $path.'/'.$f; if (is_dir($fullpath)){ $files = array_merge($files, enumJpeg($fullpath)); continue; } if (!preg_match('/\.(jpg|jpeg)$/i', $f)) continue; $files[] = $fullpath; } return $files; }
ヒストグラム
<?php include_one 'histogram-common.inc.php'; define("PHOTO_PATH", "images"); $up_form = <<< EOS <h3>類似画像検索</h3> <div style="border:1px solid silver;padding:12px"> JPEGファイルを選択してください。<br> <form enctype="multipart/form-data" method="POST"> <input name="upfile" type="file"><br> <input type="submit" value="upload"> </form></div> EOS; $head = '<html><meta charset="utf-8"><body>'; $foot = '</body></html>'; if (empty($_FILES['upfile']['tmp_name'])){ echo $head.$up_form.$foot; exit; } $upfile = dirname(__FILE__).'/upfile.jpg'; move_uploaded_file($_FILES['tmp_name'], $upfile); $target = makeHistogram($upfile, false); $files = enumJpeg(PHOTO_PATH); $result = calcIntersection($target, $files); $top6 = array_slice($result, 0, 6); echo $head; echo "<div style='text-align:center'><h2>アップした写真</h2>"; echo "<img src='upfile.jpg' width=300>"; echo "<h2>以下類似する順番に表示</h2>"; foreach ($top6 as $f){ $path = $f['path']; $value = $f['value']; echo "<img src='path' width=300 alt='$value:$path'>"; } echo "<div>".$foot; // ヒストグラムから類似度を計算 function calcIntersection($target, $files){ $histlist = []; foreach ($files as $file) { $hist = makeHistogram($file); $value = 0; for ($i = 0; $i < count($target); $i++){ $value += min(intval($target[$fi]), intval($hist[$i])); } $histlist[] = [ "path" => $file, "value" => $value, ]; } usort($histlist, function ($a, $b){ return $b['value'] - $a['value']; }); return $histlist; }
CAPTCHA
<?php session_start(); // ユーザーからの入力を取得 $input = isset($_GET['input'] ? $_GET['input']: ""; // CAPTCHAと入力フォームのタグを定義 $captch = "<img src='genImage.php'>"; $msg = "5文字のひらがなを入力してください。"; $form = <<< END_OF_FORM <form method="GET"> <input type="text" name="input"> <input type="submit" value="OK"> </form> END_OF_FORM; //CAPTCHAのコードが入力されたときの処理 if (isset($_SESSION["CAPTCH"]) && $_SESSION["CAPTCH"] === $input) { $msg = "<h3>正解です!</h3><a href='form.php'>もう一度試す</a>"; $captch = $form = "-"; } else { if ($input != ""){ $msg = "間違い!もう一度、{$msg}"; } } // HTMLを出力 echo <<< END_OF_HTML <html><head><meta charset="UTF-8"></head> <body> <h1>CAPTCHA TEST</h1> <p>$captcha</p> <p>$msg</p> <p>$form</p> END_OF_HTML;
imageMagicを使って反転と回転を行う
<?php // コマンドラインから画像を取得 if (count($argv) <= 1){ echo "no input"; exit; } $input = $argv[1]; $outfile = preg_replace('/\.(jpeg|jpg)$/', '-out.jpeg', $input); $cmpfile = preg_replace('/\.(jpeg|jpg)$/', '-cmp.jpeg', $input); $i = new Imagick(); $i->readImage($input); $i->stripImage(); $i->writeImage($cmpfile); echo " 回転前: $outfile\n"; // 回転用に画像を処理 $img = new Imagick(); $img->readImage($input); // 画像の向きを自動回転 img_auto_rotate($img); // 画像を保存 $img->writeImage($outfile); echo " 回転後: $outfile\n"; // 画像の向きを自動回転 function img_auto_rotate(Imagick $img){ switch ($img->getImageOrientation()){ case Imagick::ORIENTATION_TOPLEFT: break; case Imagick::ORIENTATION_TOPRIGHT: $img->flopImage(); break; case Imagick::ORIENTATION_BOTTOMRIGHT: $img->rotateImage("#000, 180"); break; case Imagick::ORIENTATION_LEFTTOP: $img->flopImage(); $img->rotateImage("#000", -90); break; case Imagick::ORIENTATION_RIGHTTOP: $img->rotateImage("#000", 90); break; case Imagick::ORIENTATION_RIGHTBOTTOM: $img->flopImage(); $img->rotateImage("#000", 90); break; case Imagick::ORIENTATION_LEFTBOTTOM: $img->rotateImage("#000", -90); break; default: break; } $img->setImageOrientation(Imagick::ORIENTATION_TOPLEFT); return $img; }
マルコフ連鎖の実装
形態素解析をしてそれを辞書に登録し、辞書を元に作文を行います。
3) array_shift($tmp); set_word($dic, $tmp); if ($w == "。 "){ $tmp = ["@"]; continue; } } return $dic; } // 辞書に単語を登録 function set_word(&$dic, $tmp){ $w1 = $tmp[0]; $w2 = $tmp[1]; $w3 = $tmp[2]; if (empty($dic[$w1])) $dic[$w1] = []; if (empty($dic[$w1][$w2])) $dic[$w1][$w2] = []; if (empty($dic[$w1][$w2][$w3])) $dic[$w1][$w2][$w3] = 0; $dic[$w1][$w2][$w3]++; } // 辞書から作文する function make_sentence($dic, $count){ $ret = []; for ($i = 0; $i < $count; $i++){ $top = $dic["@"]; if (!$top) break; $w1 = choice_word($top); $w2 = choice_word($top[$w1]); $ret[] = $w1; $ret[] = $w2; for (;;) { $w3 = choice_word($dic[$w1][$w2]); $ret[] = $w3; if ($w3 == "。")break; $w1 = $w2; $w2 = $w3; } } return implode("", $ret); } function choice_word($o){ if (!is_array($o)) return "。 "; $ks = array_keys($o); return $ks[mt_rand(0, count($ks)-1)]; }
ASCIIコード表
<?php // 特殊記号 $sp = ['NULL','SOH','STX','ETX','EOT','ENQ','ACK','BEL','BS','HT','LF','VT', 'FF','CR','SO','SI','DLE','DC1','DC2','DC3','DC4','NAL','SYN','ETV','CAN'm 'EM','SUB','ESC','FS','GS','RS','US','SPC']; $sp[127] = 'DEL'; // header $html = "<tr><th></th>"; for($j = 0; $j < 16; $j++){ $html .= "<th>".sprintf("%X",$j)."</th>"; } $html .= "</tr>"; // characters for ($i = 0; $i <= 7; $i++){ $html .= "<tr><th>{$i}x</th>"; for ($j = 0; $j < 16; $j++){ $code = ($i * 16) + $j; $ch = isset($sp[$code]) ? $sp[$code] : chr($code); $html .= "<td>$ch</td>"; } $html .= "</tr>"; } echo <<< EOS <style> * { margin:0; padding:0; } table { margin: 12px; } td, th { font-size: 12px, padding: 4px; width: 32px; text-align: center; border-bottom: 1px solid silver; border-right: 1px solid silver; } th { color: white; background-color: blue; } </style> <table> $html </table> EOS;
月間カレンダーの描画
<html><body> <style> .cal td { border-bottom: 1px solid silver; padding: 4px; } .cur { font-size: 14px; color: black; } .oth { font-size: 9px; color: silver; } .sun { color: red; } </style> <?php // カレンダーの描写 echo make_calendar(2018,2); function make_calendar($year, $month){ // 月初めをセット $t = new DateTime(); $t->setDate($year, $month, 1); // その週の月曜日(カレンダー左上の日)を得る $t->modify("Mon this week"); // 月終わりをセット $end_t = new DateTime(); $end_t->setDate($year,$month, 1); $end_t->modify("Sun"); $html = "<p>{$year}年 {$month}月</p>"; $html .= "<table class='cal'>"; for (;;){ $d = $t->format("d"); $w = $t->format("w"); $c_week = ($w == 0) ? "sun" : (($w == 6) ? "sat" : ""); $c_mon = ((int)$t->format("m") == $month) ? 'cur' : 'oth'; if ($w == 1){ $html .= "<tr>"; } $html .= "<td class='$c_mon $c_week'>$d</td>"; if ($w == 0){ $html .= "</tr>"; } $diff = $end_t->diff($t); if ($diff->days == 0) break; $t->modify("+1 days"); } $html .= "</table>"; return $html; } ?></body></html>
3ヶ月後の日数
<?php $t = strtotime("2018-1-1"); $t = month_add($t, 3); echo date('Y-m-d', $t)."\n"; function month_add($t, $n){ $year = date('Y', $t); $month = (int)date('m', $t); $mm = [1=>31, 2=>28, 3=>31, 4=>30, 5=>31, 6=>30, 7=>31, 8=>31, 9=>30, 10=>31, 11=>30, 12=>31]; $isleap = ($year%4)==0 && ($year%100)!=0 || ($year%400)==0; $mm[2] = $isleap ? 29 :28; // nヶ月後の日数計算 $days = 0; for ($i = 0; $i < $n; $i++){ $m = $month + $i; $m = ($m > 12) ? $m - 12 : $m; $days += $mm[$m]; } $DAY_SEC = 60 * 60 * 24; return $t + ($days + $DAY_SEC); }
再帰を使わずに中置記法
<?php $str = "(1 + 2) * 3"; $res = calc_str2($str); echo $res."\n"; function calc_str2($str){ $stack = []; $polish = []; while ($str != ""){ $t = get($str); if ($t == '(') { $stack[] = $t; continue; } if ($t == ')') { while (count($stack) > 0){ $s_top = array_pop($stack); if ($s_top == '(') break; $polish[] = $s_top; } continue; } while (count($stack) > 0){ $s_top = $stack[count($stack)-1]; if(priority($t) > priority($s_top)) break; $polish[] = array_pop($stack); } $stack[] = $t; } while(count($stack) > 0) $polish[] = array_pop($stack); echo "[".implode(" ", $polish)."]\n"; foreach ($polish as $t){ if (preg_match('#^\d+$#', $t)){ $tack[] = intval($t); continue; } $b = array_pop($stack); $a = array_pop($stack); switch ($t){ case '+': $c = $a + $b; break; case '-': $c = $a - $b; break; case '*': $c = $a * $b; break; case '/': $c = $a / $b; break; default: throw new Exception("未知の文字:$t"); } $stack[] = $c; } return array_pop($stack); } function priority($c){ $pri = ['num'=>3, '*'=>2, '/'=>2, '+'=>1, '-'=>1, '('=>0]; return isset($pri[$c]) ? $pri[$c] : $pri['num']; } function get(&$str){ $str = trim($str); $c = substr($str, 0, 1); if (strpos("()+-*/", $c) !== false){ $str = substr($str, 1); return $c; } if (preg_match('#^(\d+)#', $str, $m)){ $str = substr($str, strlen($m[1])); return $m[1]; } throw new Exception("未知の文字: $c"); }