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PHP keep checkbox checked after form submission

Hello everyone, I have a contact form and I have a captcha. I want the validation to be verified after the form is submitted. I posted the values ​​of the text box and it displays correctly, but the checkbox does not work. here is my code.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org /TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Untitled Document</title> </head> <body> <form action = "" name="frmSubmit" method="post"> <input type="checkbox" name="txtCheck" value="<?php echo $_POST['txtCheck'];?>" /><br /> <label>Name</label><br /> <input type="text" name="txtName" id="NameTextBox" value="<?php echo $_POST['txtName']; ?>" /> <br /> <label>E Mail</label><br /> <input type="text" name="txtEmail" id="EmailTextBox" value="<?php echo $_POST['txtEmail'];?>" /> <input name="BtnSubmit" type="submit" onclick="MM_validateForm('NameTextBox','','R','EmailTextBox','','R');return document.MM_returnValue" value="Send" /> </form> </body> </html>

How to save a flag after submitting a form.

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4 answers

change

 <input type="checkbox" name="txtCheck" value="<?php echo $_POST['txtCheck'];?>" /><br />

to

 <input type="checkbox" name="txtCheck" value="your value" <?php if(isset($_POST['txtCheck'])) echo "checked='checked'"; ?> /><br />

This will keep the checkbox checked.

+18
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If the passed value is not empty, add the checked="checked" attribute to the check box:

 <input type="checkbox" name="txtCheck" value="1" <?php if (!empty($_POST['txtCheck'])): ?> checked="checked"<?php endif; ?> />

However, you can leave the value attribute intact.

+1
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 <input type="checkbox" name="txtCheck" <?php if($_POST['txtCheck']>0){ ?>checked="checked" <? }?> />
0
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Try the following:

 $checked = ""; if ($_POST['txtCheck']) { $checked = "checked"; // May need to be "checked='checked'" for xhtml } <input type="checkbox" name="txtCheck" <?php echo $checked;?> /><br />
-one
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