[Solved] What is the issue with this shortcode handler?function display_shortcode($atts) { return "Number: " . $atts['number']; } add_shortcode('display', 'display_shortcode');Used as: [display] | Wordpress

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What is the issue with this shortcode handler?

function display_shortcode($atts) {
  return "Number: " . $atts['number'];
}
add_shortcode('display', 'display_shortcode');

Used as: [display]

AShortcode name 'display' is invalid

BShortcode is missing the add_shortcode call

CFunction should echo instead of return

DAccessing undefined index 'number' without default causes a PHP notice

Step-by-Step Solution

Solution:

Step 1: Check parameter usage
The handler accesses $atts['number'] without setting a default.
Step 2: Analyze shortcode usage
Since [display] is used without parameters, 'number' is undefined.
Final Answer:
Accessing undefined index 'number' without default causes a PHP notice -> Option D
Quick Check:
Always set defaults to avoid notices [OK]

Quick Trick: Always provide defaults for shortcode parameters [OK]

Common Mistakes:

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What is the issue with this shortcode handler?