無病呻吟

1.

<?php

echo "string"

?>

PHP以<?php... codecodecode... ?>為前後引號

echo將後面的code顯示於網頁上

2.

"."就像"+"號

3.

所有PHP裡 variable names 是以( $ ).做開頭

EX：

• $myName = "Beyonce";
• $myAge = 32;

4.

基礎運算符號

• > Greater than
• < Less than
• <= Less than or equal to
• >= Greater than or equal to
• == Equal to
• != Not equal to

5.

if判斷式

EX：

<?php  $age = 17;  if( $age > 16 ) {    echo "You can drive!";  }?>

6.Switch

<?php
switch (2) {
case 0:
echo 'The value is 0';
break;
case 1:
echo 'The value is 1';
break;
case 2:
echo 'The value is 2';
break;
default:
echo "The value isn't 0, 1 or 2";
}
?>

7.多樣選擇(if/else & Swith)

EX.

if ($i == 1 ||    $i == 2 ||    $i == 3) { echo '$i is somewhere between 1 and 3.';}

在swith的case之後，不要加上break，繼續往下增加case，亦可以達成，此方法稱為 falling through

EX.

<?php
$i = 5;

switch ($i) {
case 0:
echo '$i is 0.';
break;
case 1:
case 2:
case 3:
case 4:
case 5:
echo '$i is somewhere between 1 and 5.';
break;
case 6:
case 7:
echo '$i is either 6 or 7.';
break;
default:
echo "I don't know how much \$i is.";
}
?>

 8.陣列

在PHP中之陣列如下例所示：

<?php

      $array = array("Egg", "Tomato", "Beans");

?>

陣列中之編號從0開始

所以$array = array("Egg", "Tomato", "Beans");

$array[0] //"Egg"

$array[1] //"Tomato"

$array[2]//"Beans"

移除陣列中某個項目

<?php  

$array = array("red", "blue", "green");  

unset($array[2]);

?> 

或是整個陣列

<?php  

unset($array);

?>

9.For迴圈

EX:

<?php
for ($i = 0; $i < 10; $i++) {
    echo $i;
}
// echoes 0123456789
?>

foreach：疊代指定項目(通常是陣列)中所有物件

EX：

<?php
  $numbers = array(1, 2, 3);

  foreach($numbers as $item) {
      echo $item;
  }
?>

 10.While迴圈

當指定條件未達成時持續進行迴圈操作

ex:

$loopCount = 0;
while ($loopCount<4){
   echo "<p>Iteration number: {$loopCount}</p>";
   $loopCount ++;
}

也可以寫成這樣

while(cond):
   // looped statements go here
endwhile;

運用do-while迴圈，可以先運作一次迴圈內程式後再判定是否符合繼續迴圈條件

<?php
$i = 0;
do {
    echo $i;
} while ($i > 0);
?>

 11.換行

."<br>"

EX: 

echo $len."<br>";
print $mygf;

12.for 迴圈

EX：