How to Properly Handle Spaces in HTML Value Attributes Set with PHP?

Setting HTML Value Attributes with Spaces in PHP

When setting the value of a HTML form input element using PHP, spaces in the data can cause issues.

A typical code snippet looks like this:

<input type="text" name="username"
<?php echo (isset($_POST['username'])) ? "value = ".$_POST["username"] : "value = \"\""; ?> />

However, if the username contains spaces, only the first word is displayed when the form is submitted. The issue is that spaces in the value attribute become attribute separators.

To resolve this, you need to quote the value:

<input value="<?php echo (isset($_POST['username']) ? htmlspecialchars($_POST['username']) : ''); ?>" />

This ensures that the space is treated as part of the value and not as an attribute separator. Additionally, using htmlspecialchars() helps prevent XSS attacks by escaping any special characters.

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