今日課程:PHP 3天基礎鞏固視頻教程【燕十八】
1、遞增遞減運算符//先運算在輸出
$b = 5; $a = $b++; var_dump($a,$b);//5,6 echo '<br />'; $b = 5; $a = $b--; var_dump($a,$b);//5,4 echo '<br />'; $b = 5; $a = ++$b; var_dump($a,$b);//6,6。1:把b的值+1,2:返回新值 echo '<br />'; $b = 5; $a = --$b; var_dump($a,$b);//
2、字符串運算符//.
echo '<br />'; $a = 'hello'; $b = 'word'; $c = $a . $b; var_dump($c); echo '<br />'; $d = 112; $c = $c . $d; var_dump($c); //下列那個運算速度快 echo '<br />'; $a = 'hello'; $b = 'word'; echo $a , $b;//運算更快 echo $a . $b;
3、賦值運算符
echo '<br />'; $a = 3;//賦值運算,1:賦值給$a,2:返回運算結果 $res = ($a = 3); var_dump($res);
4、switch cash控制結構//swich case 適合用在驗證多個可能的值,不適用判斷範圍,比如60-80幾個。80-100優
echo '<br />'; $tody == 1; if ($tody = 1) { echo "今天是星期1"; }else if($today == 2 ){ echo "今天是星期2"; }else if($today == 3 ){ echo "今天是星期3"; }else if($today == 4 ){ echo "今天是星期4"; }else if($today == 5){ echo "今天是星期5"; }else if($today == 6 ){ echo "今天是星期6"; }else if($today == 7){ echo "今天是星期7"; }else { echo "你來自火星"; } echo '<br />'; $today = 3; switch ($today) { case 1: echo "今天是星期1"; break; case 2: echo "今天是星期2"; break; case 3: echo "今天是星期3"; break; case 4: echo "今天是星期4"; break; case 5: echo "今天是星期5"; break; case 6: echo "今天是星期6"; break; case 7: echo "今天是星期7"; break; default: echo "你來自火星"; }
5、while循環、do while(總能執行一次)
echo '<br />'; $i = 0; while($i <= 10){ echo $i++,'<br />'; } $i = 100; do { echo $i++.'<br />'; } while ( $i <= 10); echo '<br />';
週末去玩了,昨天好累,今天繼續努力到放棄,第五天~~