<?php
// $smith = "";
$submit ="button_a";
if($submit == "button_a") {
$smith = "button_a";
}
elseif($submit == "button_b"){
$smith = "button_b";
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="https://www.w3.org/1999/xhtml">
<head>
</head>
<body>
<p>
<?php echo($smith); ?>
</p>
</body>
</html>
<?php
// $smith = "";
$submit ="button_a";
阅读背景：
phpstorm警告php变量可能没有被定义
来源：互联网
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