php回显内的echo回显

I'm trying to use checkboxes to display and update records in a MySQL database. I want to change the value of the checkbox based on whether it's checked or unchecked. But I'm getting this error:

Parse error: syntax error, unexpected T_ENCAPSED_AND_WHITESPACE, expecting T_STRING or T_VARIABLE or T_NUM_STRING

Here's the line of code that's throwing the error:

echo"<input type='checkbox' name='PLJan' {if (isset($_POST['PLJan'])) print 'value='checked''} $row->PLJan /> January ";

Is there a better way for me to do this so that saving it will update the database with 'checked' if the box is checked, and a blank if the box is unchecked?

Thanks in advance for the halps.

echo"<input type='checkbox' name='PLJan' {if (isset($_POST['PLJan'])) print 'value='checked''} $row->PLJan /> January ";

should be

echo"<input type='checkbox' name='PLJan'"; 
if (isset($_POST['PLJan'])) { echo " value='checked'"; } 
echo $row->PLJan . "/> January ";

You can't include PHP logic in the moddle of a string. You'll need to break it up:

echo"<input type='checkbox' name='PLJan'";
if (isset($_POST['PLJan'])) echo ' checked';
echo " {$row->PLJan} /> January ";

?>
<input type='checkbox' name='PLJan' <?php if (isset($_POST['PLJan'])) echo 'checked="checked"'; ?> /> January
<?php

Your notation is all off ... simplest solution is to break it apart to muliple echo statements.

echo "<input type='checkbox' name='PLJan' ";
if (isset($_POST['PLJan'])){  
        echo  "checked='checked'";
} 
echo "value='".$row->PLJan."'/> January ";

With that you can simplify it using a ternary if

echo "<input type='checkbox' name='PLJan' ";
echo (isset($_POST['PLJan'])?"checked='checked'":"");
echo "value='".$row->PLJan."'/> January ";

And if you want to compress it down to a single line you can concatenate the echos together

echo "<input type='checkbox' name='PLJan' ".(isset($_POST['PLJan'])?"checked='checked'":"")." value='".$row->PLJan."'/> January ";

Try This

<?php

echo"<input type='checkbox' name='PLJan'";

if (isset($_POST['PLJan']))
{
 echo ' checked';
}
echo " {$row->PLJan} /> January ";
?>