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问题:

With PHP it's possible to check if a cookie exists. Is there a similar way to check if a HTML5 sessionStorage (webstorage) item exists?

回答1:

If you mean by sessionStorage the HTML5 web storage (as I understand from the tags in your question), then no. It is not possible to access this data from PHP. It can only be accessed with JavaScript and passed through to PHP with AJAX.

回答2:

No. PHP is server side language and storage or cache are browser dependent, so it is not possible check storage or cache directly from server.

回答3:

This worked.

HTML side:

<body onLoad="submitform()">

<form name="myform" method="post" action="example.php">
   <input type="text" name = "var" id="var">
</form>

<script type="text/javascript">

function submitform()
{
  document.getElementById("var").value = sessionStorage.getItem('var');
  document.myform.submit();
}
</script>

PHP side:

echo $_REQUEST['var'];

回答4:

You want to pass a variable from HTML5 into PHP, which requires auto-submit. Try this, though I've never tried it myself.

Create an invisible text input. Have JavaScript change the input value to the value returned from sessionStorage.getItem("key"), and use the onload='this.form.submit()' line in the tag.

 <form name = 'phpvar' onload='this.form.submit()'><br>
 <input type = "text" value = sessionStorage.getItem("key")>

I didn't actually do the work for you, but I hope this gives you a good idea.

Check if HTML5 sessionStorage value exists with PH

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Check if HTML5 sessionStorage value exists with PH

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