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Editorial Team
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Asked: 2026-05-13T17:37:59+00:00

I want to validate a form to make sure a user writes in a

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I want to validate a form to make sure a user writes in a name and last name.

If a user writes in only his last name, the form should show again with an error message beside the last name field, but the name value should still be there.

I don’t know how to do this, hehe. I’m just a newbie PHP programmer.

Here’s what I have so far:

<html>
<head>
</head>

<body>
    <form action="formprueba.php" method="get">
        <dl>
            <dt>Last Name:</dt>
            <dd><input type="text" value="" name="name" />
                <?php if((isset($_GET['name'])) && ($_GET['name'] == "")){
                    echo "Please write a correct name.";
                }
                ?>
            </dd>                

            <dt>Last Name:</dt>
            <dd><input type="text" value="" name="lastname" />
                <?php if((isset($_GET['lastname'])) && ($_GET['lastname'] == "")){
                    echo "Please write a correct last name.";
                }
                ?>
            </dd>

            <br />                
            <dt>
                <input type="submit" value="enviar" />
            </dt>
            <input type="hidden" name="enviado" value="j"/>
        </dl>
    </form>
</body>

Also, I’m sure this validation is horrible, if you have a couple of minutes, I’d be really grad if someone can show me a more efficient way to validate (without using third party addons).

Thanks SO.

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1 Answer

  1. Editorial Team

    Place the variable you need into the “value” field of your input-tag like this:

    <input type="text" value="<?php echo htmlspecialchars($_GET['lastname']); ?>" name="lastname" />

    AND it’s important to quote at a minimum the HTML characters someone might put in (by htmlspecialchars).

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