rivas rivas - 1 year ago 67
HTML Question

How to set a radio button checked dynamically via php?

In this code we want to read line 7 of a file with our shell and if the value is "set" we want to change the status of our checkbox to checked.

<input type="radio" name="myName" value="myValue" <?php
if( shell_exec("./read_from_db 7")=="set") echo ' checked="checked"'

It seems this code those not work. Even though line 7 of the file is "set" the radio button is not checked. Why is that? What's wrong with the code?

Answer Source

The result coming from shell_exec is giving you something extra.

Try using trim, so:

if( trim(shell_exec("./read_from_db 7"))=="set") echo ' checked="checked"'

Here is a test:

var_dump(shell_exec('echo set'));
echo '<br>';
var_dump(trim(shell_exec('echo set')));
echo '<br>';
$v1 = shell_exec('echo set') == 'set';
$v2 = trim(shell_exec('echo set')) == 'set';
echo '<br>';

and the output:

string(4) "set "
string(3) "set"

You can see that even with no space in the original code, it added something there. My guess is that it is some sort of line break or anything like that.

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