You want to save a user preference 'font_size' only if it is a positive integer. Which code snippet correctly updates the setting safely?

hard📝 Application Q15 of 15

Wordpress - WordPress Settings and Configuration

A<pre>update_option('font_size', $_POST['font_size']);</pre>

<pre>$size = intval($_POST['font_size']);
if ($size > 0) {
  update_option('font_size', $size);
}</pre>

<pre>if ($_POST['font_size']) {
  update_option('font_size', $_POST['font_size']);
}</pre>

<pre>$size = $_POST['font_size'];
update_option('font_size', $size > 0 ? $size : 12);</pre>

Step-by-Step Solution

Solution:

Step 1: Validate and sanitize the input
```
$size = intval($_POST['font_size']);
if ($size > 0) {
  update_option('font_size', $size);
}
```
uses intval to convert input to integer and checks if it is positive before saving.
Step 2: Confirm safe update of option
Only if the value is positive does it call update_option, preventing invalid data.
Final Answer:
$size = intval($_POST['font_size']);
if ($size > 0) {
update_option('font_size', $size);
} -> Option B
Quick Check:
Validate input before update_option [OK]

Quick Trick: Always validate input before update_option [OK]

Common Mistakes:

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