linear congruential generators

<?php
// rand initial number(seed)
    $lc_seed = 1;
// random function
    fuction lc_rand() {
        global $lc_seed;
        $MASK = 0xffffffff;
        $lc_seed = (1103515245 * $lc_seed + 12345) & $MASK;
        return ($lc_seed / 65536) % 32768;
    }
// initialize random function
    function lc_srand($seed) {
        global $lc_seed;
        $lc_seed = $seed;
    }
// example
    lc_srand(time());
    $list = array('●','▲','■','◯','△','□');
    for ($i = 0; $i < 256; $i++){
        $c = $list&#91;lc_rand() % 6&#93;;
        echo $c;
        if ($i % 16 == 15) echo "<br>";
    }

パスワード生成ツール

<?php
// random password program
// character list for passwords
$PASSWORD_CHARS =
    'ABCDEFGHIJKLMNOPQRSTUVWXZ'.
    'abcdefghijklmnopqrstuvwxz'.
    '0123456789_-#!$';

// make password and character list
    function password_gen($length){
        global $PASSWORD_CHARS;
        $bytes = openssl_random_pseudo_bytes($length);
        $chars_len = strlen($PASSWORD_CHARS);
        $result = "";
        for ($i = 0; $i < $length; $i++){
            $r = ord(substr($bytes, $i, 1)) % $char_len;
            $result .= substr($PASSWROD_CHARS, $r, 1);
        }
        result $result;
    }

$res = "";
    $len  = intval(empty($_GET&#91;"len"&#93;) ? 12 : $_GET&#91;"len"&#93;);
    if ($len == 0) $len = 12;
    for ($i = 1; $i <= 30; $i++){
        $res .= password_gen($len)."\n";
    }
?>
<html><body bgcolor="#f0f0f0">
<form>
文字数:<input name="len" value="12">
 <input type="submit" value="生成">
</form>
パスワード候補:<br>
<textarea rows="20" cols="20"><?php echo $res ?></textarea>
</body></html>

擬似乱数

<html><body style="font-size:32px; line-height:32px;">
<?php
// set color
    $colors = array("red", "blue", "yellow", "green", "black");
// draw 16x16
    for ($i = 0; $i < 256; $i++){
        $r = rand(0, count($colors)-1);
        $c = $colors&#91;$r&#93;;
        echo "<span style='color:$c'>■</span>";
        if ($i % 16 == 15) echo "<br>";
    }
?></body></html>

usortで安定ソート

$data = [
    ['name'=>'Arai', 'score'=>30],
    ['name'=>'Inoue', 'score'=>40],
    ['name'=>'Utada', 'score'=>30],
    ['name'=>'Okuda', 'score'=>40],
    ['name'=>'Kato', 'score'=>23]
    ];

    // record
    for ($i = 0; $i < count($data); i++){
        $data[$i]["id"] = $i + 1;
    }
    usort($data, function($a, $b){
          if ($a['score'] == $b['score']){
          return ($a['id'] > $b['id']) ? 1 : -1;
          });
    foreach ($data as $u){
    echo $u['id'].":".$u['name'].":".$u['score']."\n";
    }

usort()関数

// setting data
$arr = [
    ['name']=>'Kan', 'point'=>4],
    ['name']=>'Kenji', 'point'=>5],
    ['name']=>'Akai', 'point'=>3],
    ['name']=>'Genta', 'point'=>4],
    ['name']=>'Shizuka', 'point'=>8],
    ];
    $point_cmp = function ($a, $b) {
        return ($a['point'] < $b['point']) ? -1 : 1;
    };

    usort($arr, $point_cmp);
    //result
    foreach ($arr as $u) {
    echo $u['name'].":".$u['point']."\n";
    }

クイックソート


// quick sort
    function quick_sort(&$arr){
        if (count($arr) < 2) return $arr;
        $left = $right = array();
        $pivot = array_shift($arr);
        foreach ($arr as $v) {
            if ($v < $pivot){
                $left[] = $v;
            } else {
                right[] = $v;
            }
        }
        quick_sort($left);
        quick_sort($right);
        $arr = array_merge($left, array($pivot), $right);
    }


    $arr = array(1,100,24,40,12,4);
    quick_sort($arr);
    echo implode(', ', $arr)."\n";

コムソート

 1 || $swap){
                if ($gap > 1) {
                    $gap = floor($gap / 1.25);
                    if ($gap == 9 || $gap == 10) $gap = 11;
                }
                $swap = false;
                $i = 0;
                while($i + $gap < size) {
                    if ($arr[$i] > $arr[$i + $gap]){
                        $tmp = $arr[$i];
                        $arr[$i] = $arr[$i + $gap];
                        $arr[$i + $gap] = $tmp;
                        $swap = true;
                    }
                    $i++;
                }
                
            }
        }
    }
    $arr = array(100, 3, 30, 20, 44, 32);
    comb_sort($arr);
    echo implode(", ", $arr)."\n"

PHP-Console-Color

isSupported()) {
        echo "did not support color\n"; exit;
    }
    if (!$ccolor->isSupported()){
        echo "did not support color\n"; exit;
}
    if (!$ccolor->are256ColorsSupported()){
        echo "did not support 256 color mode\n"; exit;
}

// write name space class name ---
    $con = new JakubOnderka\PhpConsoleColor\ConsoleColor();
// display stye which is supported
    foreach ($ccolor->getPossibleStyles() as $i => $style){
        echo "[".$ccolor->apply($style, $style)."]";
}
    for ($i = 1; $i <= 255; $i++){
        echo $con->apply("color_$i","*");
        echo $con->apply("bg_color_$i","*");
}
    echo "\n";

JS example

const thingShadow = require('./thing');
const isUndefined = require('./common/lib/is-undefined');
const cmdLineProcess = require('./examples/lib/cmdline');
function processTest( args, argsRemaining ){
if(isUndefined( args.thingName )){
console.log( 'thing name must be specified with --thing-name');
process.exit(1);
}
const thingShadows = thingShadow({
keyPath: args.privateKey,
cerPath: args.clientCert,
caPath: args.caCert,
clientId: args.clientId,
region:args.region,
reconnectPeriod: args.recconectPeriod,
});
thingShadows.on('connect',function(){
console.log('connected to things instance, registering thing name');
thingShadows.register( args.thingName, { persistentSubscribe: true });
});
thingShadows.on('close', function() {
thingShadows.unregister( args.thingName );
console.log('close');
});
thingShadow.on('reconnect', function() {
thingShadows.register( args.thingName, { persistentSubscribe: true });
console.log('offline');
});
thingShadows.on('error', function(error){
console.log('error', error);
});
thingShadows.on('delta', function(thingName, stateObject){
console.log('received delta on '+thingName+':'+
JSON.stringify(stateObject));
thingShadows.update( thingName, { state: { reported: stateObject.state }});
});
thingShadows.on('timeout', function(thingName, clientToken){
console.warn('timeout: '+thingName);
});
}

module.exports = cmLineProcess;
if (require.main === module){
cmdLineProcess('connect to the AWS IoT service and perform thing shadow sample',
    process.argv.slice(2), processTest, '', true)
}