can't access viarible in the target php files [closed] - php

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At first I write a simple hotel.php
<div role="main" class="ui-content">
<?php
$info = $_GET['type'];//works well $info get num= 1;
?>
<h3 class="ui-bar ui-bar-a ui-corner-all">order</h3>
<div class="ui-body ui-body-a ui-corner-all">
<form action="sendmail.php" method="get">
<ul data-role="listview" data-inset="true">
<li class="ui-field-contain">
<label for="name">name</label>
<input type="text" name="name" id="name" vlaue="" data-clear-btn="true">
</li>
<li class="ui-field-contain">
<label for="phone">phone</label>
<input type="text" name="phone" id="name2" vlaue="" data-clear-btn="true">
</li>
<li class="ui-field-contain">
<input class="invisible" type="text" name="room_info" value="<?php $_GET['type'];?>">
<label for="slider-2">num</label>
<input type="range" name="slider-2" id="slider-2" data-mini="true" data-highlight="true" min="1" max="6" value="4" data-clear-btn="true">
</li>
<li class="ui-field-contain">
<label for="arrive-time">a_time</label>
<input type="datetime-local" name="arrive-time" id="arrive-time" value="" data-clear-btn="true">
</li>
<li class="ui-field-contain">
<label for="leave-time">b_time</label>
<input type="datetime-local" name="leave-time" id="arrive-time" value="" data-clear-btn="true">
</li>
<li class="ui-body ui-body-b">
<fieldset class="ui-grid-a">
<div class="ui-block-a"><button type="reset" class="ui-btn ui-corner-all ui-btn-a">reset</div>
<div class="ui-block-b"><button type="submit" class="ui-btn ui-corner-all ui-btn-a" data-ajax="false">sbumit</div>
<fieldset>
</li>
</ul>
</form><!--end form-->
</div>
</div>
It's strange that $info = $_GET['type']; works well and the $info get the value correctly.
but when I click the submit button.
in target webpage sendmail.php
$name=$_GET['name'];
$phone=$_GET['phone'];
$roominfo=$_GET['room_info'];
$num=$_GET['slider-2'];
$a_time=$_GET['arrive-time'];
$b_time=$_GET['leave-time'];
all get the right information except the roominfo is null.
what's the problem with this">I try this">but steel not work

Answer 1

Try to echo:
<input class="invisible" type="text" name="room_info" value="<?php $_GET['type'];?>">
to
<input class="invisible" type="text" name="room_info" value="<?php echo $_GET['type'];?>">
EDIT
OP seems to want this element hidden so that's why there is invisible class. Well, you don't need to create a class for this case. You can use hidden.
<input type="hidden" name="room_info" value="<?php echo $_GET['type'];?>">

Answer 2

Use echo
<input class="invisible" type="text" name="room_info" value="<?php echo $_GET['type'];?>">