PHP 常見語法

isset() 函数用於檢測是否已設定並且非 NULL

$pathinfo = isset( $_SERVER['PATH_INFO'] ) ? $_SERVER['PATH_INFO'] : '';

list(var1,var2...)

<?php
$my_array = array("Dog","Cat","Horse");

list($a, $b, $c) = $my_array;
echo "I have several animals, a $a, a $b and a $c.";
?>

isset() 和 empty() 的區別
isset 判斷的是 “變數”
empty 判斷的是 “值”