PHP 判断目标值是否为空并进行替换值

如果非空

则输出原始值 hexingxing.cn

<?php
$domain = "hexingxing.cn";
$replace = "hxx.tw";

if (empty($domain)) {
  echo $replace; //echo "hxx.tw";
}
else {
  echo $domain;
}
?>

如果为空

则输出替换值 hxx.tw

<?php
$domain = "";
$replace = "hxx.tw";

if (empty($domain)) {
  echo $replace; //echo "hxx.tw";
}
else {
  echo $domain;
}
?>

函数调用

函数 function hexingxing(){}

调用 hexingxing();

方案一

作用域内部常量：$isValue = "";

<?php
function hexingxing(){
$isValue = "";
$disabled = '无效';
$enabled = '有效';

if (empty($isValue)) {
  echo $disabled;
}
else {
  echo $enabled;
}
}
?>
<?php hexingxing(); ?>

方案二

作用域全局变量：global $staffId;

<?php
function hexingxing(){
global $staffId;
$disabled = '无效';
$enabled = '有效';

if (empty($staffId)) {
  echo $disabled;
}
else {
  echo $enabled;
}
}
?>
<?php hexingxing(); ?>