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Javascript - Using function repeatedly

How to use the return of the function in simplified way? The code below returns true or false. I'd like to put it into a php variable and have this occur on the loading of the page.

<html>
<head>
<script type="text/javascript">
function supports_input_placeholder ( )
{
	var i = document.createElement("input");
	return "placeholder" in i;
}
</script>
</head>
<body>

<script type="text/javascript">
document.write(supports_input_placeholder())
</script>

</body>
</html>

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To be used later like:
<input type="text" <?php if $place_holder { echo "placeholder=\"10 digit number\""; } maxlength="16" />

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I do know one is server side and one is client side.

Thanks
JavaScriptHTML

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dolan2go
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Gurvinder Pal Singh
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dolan2go
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ASKER

@gurvinder372,

How to put the return into a php variable or Session variable? Like $place_holder in the one line of code <input> above.
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dolan2go
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ASKER

The intent is to arrive at a simpler (and working) method of this:

	<input type="text" name="text" <script type="text/javascript"> var p = s_i_p(); if (p == true) { document.write("placeholder=\"10 digit number\""); } </script> class="input_phone" maxlength="16" />

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in lieu of:
<input type="text" name="text" placeholder="10 digit number" class="input_phone" maxlength="16" />

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only if the function supports_input_placeholder() returns 'true'.
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dolan2go
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ASKER

Long overdue.
JavaScript
JavaScript

JavaScript is a dynamic, object-based language commonly used for client-side scripting in web browsers. Recently, server side JavaScript frameworks have also emerged. JavaScript runs on nearly every operating system and in almost every mainstream web browser.

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