20200512-php-baseclass-6

3_function.php

<?php
/*可以拿來查看PHP環境，作為檢查上的資訊確認*/
// phpinfo();

/*隨機變數，給兩個數字做為區間範圍*/
echo "rand(1,100)=" . rand(1, 100);

print("<hr>");

/*系統時間與日期*/
$now = date("Y-m-d H:i:s");
echo "系統時間為 " . $now . "<br>";

//date()可以根據想要的format(前面)去顯示，同時也能做增加減少(後面)但必須先把文字轉成時間語
$timelang = strtotime("+6 hours"); //你可以試著echo 這裡會得到一堆數字
$tw = date("Y-m-d H:i:s", $timelang);	//台灣時間
echo "台灣時間為 " . $tw . "<br>";

print("<hr>");

//時區宣告
date_default_timezone_set('Asia/Taipei');
echo "現在系統時間為 " . date("Y-m-d H:i:s");	//台灣時間

print("<hr>");

// ceil 無條件進位
// floor 無條件捨去
// round 四捨五入
echo "10÷3=??<br>";
echo "ceil: " . ceil(10 / 3) . "<br>";
echo "floor: " . floor(10 / 3) . "<br>";
echo "round: " . round(10 / 3) . "<br>";

print("<hr>");

// substr 擷取字串
echo substr("abcdefg", 2, 3) . "<br>";
echo mb_substr("不要打架要打去練舞室打", 4, 6);

print("<hr>");

//chr 轉為ascii code=> 0-9, a-z,A-Z = 48-57, 97-122, 65-90
echo chr(97); //a

print("<hr>");

//練習：產生一組隨機密碼，由0-9, a-z,A-Z組成，密碼長度5~12
$num = rand(8, 16);
for ($i = 0; $i < $num; $i++) {
	$word = rand(0, 61);
	if ($word > 35)		echo chr($word + 29);
	elseif ($word > 10)	echo chr($word + 87);
	else 				echo $word;
}

print("<hr>");

/*custom function*/
function say($who, $num)
{
	echo $ai_say = "hello " . $who . "! ";
	if ($num > 60) return "You are Great";
}
$name = "Mark";
echo $msg = say($name, 30);
// echo $ai_say; //error_sample

print("<hr>");

function pwd($many)
{
	for ($run = 1; $run <= $many; $run++) {
		$num = rand(8, 16);
		$code = "";
		for ($i = 0; $i < $num; $i++) {
			$word = rand(0, 61);
			if ($word > 35)	$code .= chr($word + 29);
			elseif ($word > 10)	$code .= chr($word + 87);
			else $code .= $word;
		}
		$ary[] = $code;
	}
	return $ary;
}

$num = 5;
$result = pwd($num);
foreach ($result as $msg) {
	echo $msg . "<br>";
}
?>
<hr />

4_hw1.php

<?php
/*
回家作業1
隨機50~200顆星星填滿你的畫面，每個星星的顏色大小隨機不同
用到php=rand+for與HTML=DIV+style

高手挑戰
背景黑色，星星顏色偏向淺色系。
*/
?>
<style>
	body {
		margin: 0px;
		overflow: hidden;
		background-color: black;
	}

	@keyframes rollstar {
		from {
			transform: rotate(0deg);
		}

		to {
			transform: rotate(360deg);
		}
	}
</style>
<?php
$r_x = rand(1, 1000) / 10;  //post x use vw
$r_y = rand(1, 1000) / 10;  //post y use vh
$r_fs = rand(1, 5);  //font-size
echo '<div style="position:absolute;top:' . $r_y . 'vh;left:' . $r_x . 'vw;font-size:' . $r_fs . 'em";line-height:0;>★</div>';
//先做出一顆黑色的隨機
?>
<?php
//成功在做多顆
$r_num = rand(20, 100); //many star
for ($i = 0; $i <= $r_num; $i++) {
	$r_x = rand(1, 1000) / 10;
	$r_y = rand(1, 1000) / 10;
	$r_ts = rand(1, 3);
	$r_clr = rand(150, 255);
	$r_clg = rand(150, 255);
	$r_clb = rand(150, 255);
	echo "
		<div style='
			position:absolute;
			top:" . $r_y . "vh;
			left:" . $r_x . "vw;
			font-size:" . $r_ts . "em;
			color:rgb(" . $r_clr . "," . $r_clg . "," . $r_clb . ");
			line-height:0;
			animation: rollstar ".$r_ts."s infinite linear;
		'>
			★
		</div>
	";
}
?>

4_hw2.php

<?php
/*
回家作業2
大樂透電腦選號1~49，每次產生5~10組樂透號組不重複，每組６個號碼
用到array,array_values(),sort(),for,rand(),foreach();
*/
for($i=1;$i<50;$i++) {
	$data[]=$i;
}
// maybe you can try it => $data=range(1,49);

$pay=rand(5,10);
echo "<h1>這次購買".$pay."組樂透</h1>";
for($buy=1;$buy<=$pay;$buy++){
	$max=48;
	$play=$data;
	for($j=0;$j<6;$j++){
		$get=rand(0,$max);
		$mynumber[]=$play[$get];
		unset($play[$get]);
		$play=array_values($play);
		$max--;
	}
	sort($mynumber);
	foreach ($mynumber as $value) echo "[".$value."]";
	unset($mynumber);
	echo "<hr>";
}
?>