Help with PHP str_replace function

I have a search form input that has a Javascript placeholder of "Search whole site for..." to indicate where someone should type their search.  When the input box is clicked to type, the placeholder text is removed and teh user can type in their search keywords.  But, there are situations where we find that people are searching and it still has the "Search whole site for..." text in there, like "Search whole site for...grape jelly"

I am trying to use php to strip out the string "Search whole site for..." from the keywords and I am running into some trouble getting it to do the replacement with a blank.

This is what I have.

$keywords = $_GET['keywords'];
$keywords2 = str_replace($keywords, "", "Search whole site for...");
echo keywords2;

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For some reason it is not recognizing the string and the result is the same as the input.  Where is the problem with this code?
FourMatAsked:
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Ray PaseurCommented:
In the code snippet you need to use the dollar sign as the prefix for all PHP variables.

Please show us the HTML for this.  You may not need all of the code you have there!
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Julian HansenCommented:
Instead of using Javasript for this why not use the HTML5 placeholder

<input type="text" name="keywords" placeholder="Search whole site for..." />

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Supported on all major browsers back to IE9 - which should be the majority and saves having to use Javascript and avoids the problem you are having
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FourMatAuthor Commented:
Ray,

The lack of a $ in the variable is just a typo when I entered into EE.  I was just using this code as an example to have someone verify that the syntax for the str_replace function was correct.

Julian,
I was not aware of the placeholder attribute for HTML5.  That solves everything.  Thank you!
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Julian HansenCommented:
You are welcome.
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