What Characters are Allowed in the `name` Attribute of an Input Element in PHP?

Name Attribute Restrictions for Input Element in PHP

When dynamically generating elements in PHP, it's necessary to consider the characters allowed for the "name" attribute to ensure proper form handling.

The "name" attribute of an element cannot start with a numeric character, but must begin with a letter. However, other characters are also subject to restrictions.

Reserved Characters

Certain characters have special meanings and cannot be used in the "name" attribute. These include:

• Square brackets ([]) are used for PHP arrays, but are not allowed in the "name" attribute.
• Parentheses () are not permitted.
• Spaces are typically trimmed and replaced with underscores _.

Character Conversion

In addition to reserved characters, certain characters are converted upon form submission.

• White-space characters (e.g., spaces, tabs) are trimmed from the beginning and end of the attribute.
• Any internal white-space characters are replaced with underscores _.

For instance, a "name" attribute with "My Name" would be converted to "My_Name" after submission.

Note:

It's important to note that not all characters are submitted for "name" attributes, even with the POST method. Characters like double-quotes, angle brackets, and double percent signs are omitted from the submitted value.

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