Why this form submit isn't working as expected

问题

I have this code in test.php.

When I access the script just by typing it, I want to see just the form
but when I click the form submit button, the next time the page loads, I want to see the form and some comment that says that the form has been submitted.

For some reason, even when I click submit, I don't get the message that it's posting. Anyone can explain why? and how can I get it to work.

<body>
    <form action="" method="post">
        <input type="text" id="inp" />
        <input type="submit" value="submit" />      
    </form>

    <?php
    if (isset($_POST['submit'])) {
        echo "posting";
    }

    ?>
</body>

回答1:

Give a name to the input:

<input type="submit" name="submit" value="submit" />

回答2:

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    echo "posting";
}

回答3:

Try this:

<body>
    <form action="" method="post">
        <input type="text" id="inp" />
<input type='hidden' name='submit' value=''>
        <input type="submit" value="submit" />      
    </form>

    <?php
    if (isset($_POST['submit'])) {
        echo "posting";
    }

    ?>
</body>

来源：https://stackoverflow.com/questions/7465745/why-this-form-submit-isnt-working-as-expected

标签

php

forms

form-submit

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