復制代碼 代碼如下:

<?php
//1
define("TAX_RATE",0.08);
echo TAX_RATE; //輸出0.08
//2 (PHP 5.3)
const TAX_RATE2 =0.01;
echo '--'.TAX_RATE2; //輸出0.01
?>

復制代碼 代碼如下:

<?php
/* 定義變量區分大小寫*/
$abc=100;
$Abc=200;
echo $abc.'|'.$Abc; //輸出100|200
/*定義函數不區分大小寫 下面寫法系統會報錯:Fatal error: Cannot redeclare Abc() */
function abc(){
echo 'abc';
}
function Abc(){
echo "Abc";
}
?>