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How to implement the query when the php text box is empty

angryTom
Release： 2023-02-28 11:24:02
Original
3020 people have browsed it

How to implement the query when the php text box is empty

php does not query if the text box is empty

phpIt is very simple to determine whether a variable is empty, just use empty That’s it. The following demonstrates how to make the form content empty without querying.

1. First write the query form

Submit a wd to the server through get

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<form action="a.php" method="get">
<input type="search" name="wd">
<input type="submit" value="查询">
</form>
</body>
</html>
Copy after login

2. Then make a judgment. The wd is the content of the text box. Use empty for empty judgment

<?php
if(!isset($_GET[&#39;wd&#39;])) {
exit;
}
if (empty($_GET[&#39;wd&#39;])) {
die(&#39;为空&#39;);
}
// 在这进行查询处理
echo &#39;正在查询&#39;, $_GET[&#39;wd&#39;], &#39;...&#39;;
?>
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When the content of the text box is empty, the program will execute die and exit, and subsequent query statements will not be executed.

Effect:

How to implement the query when the php text box is empty

How to implement the query when the php text box is empty

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