问题
I have a html/php script which prints a text string directly to the page. However when I refresh the page that text is still there. I've googled this and check this forum too and tried various suggestions e.g.
<input autocomplete="off">
and
<body onload="document.FormName.reset();">
etc. None of them work.
The php code that prints the string is (if regex matches serial number then execute command else print error string):
if (preg_match($snregex, $sn, $matches)) {
<command>
} else {
echo "Invalid SN. Please re-enter!";
}
Should I print the string using a different way that can be cleared on refresh?
回答1:
if (preg_match($snregex, $sn, $matches)) {
<command>
} else {
//echo "Invalid SN. Please re-enter!";
}
try commenting the echo and check if the text is still there.
if not, every time the else loop gets executed and prints the statement.
solution:
if(isset($_POST['submit']) && (preg_match($snregex, $sn, $matches))
{
<command>
} else {
echo "Invalid SN. Please re-enter!";
}
回答2:
Is it printing out from a session or post var that's not getting cleared ? is the input field something like
input value="<?php if(isset($_POST['serial_number'])){echo S_POST['serial_number'];}?>"
来源：https://stackoverflow.com/questions/26278179/php-clear-text-printed-to-webpage