Transform html to dynamic php of hierarchical data

A compact, practical summary and fix for the symptom described by @bouhbob (static HTML works but the PHP-generated page’s drop-down toggles do not), and the observation from @chrishea that no drop-downs appear to work.

Most common causes

• The HTML that PHP prints is not the same as the working static HTML (IDs or onclick arguments are malformed or unquoted).
• The JS event is bound to an element that does not exist or has an unexpected id.
• Dots or other punctuation in id values complicate selection or cause errors.
• Script runs before the DOM is ready or a JS error stops execution (check the browser console).

Fast, reliable approach (safe, modern, and easy to debug)

• Generate simple, predictable ids (no dots): use example-1, example-2, etc.
• Avoid inline onclick string-building mistakes; instead emit a data attribute and attach a single event listener. This removes quoting/escaping issues when echoing from PHP.

Example patterns (apply these instead of inline onclick generation):

<!-- HTML produced by PHP -->
<a href="#" class="toggle" data-target="example-1">▾</a>
<div id="example-1" class="more"> ...stores... </div>

/* JS: attach once, no per-item inline JS */
document.addEventListener('click', function(e){
  var t = e.target.closest && e.target.closest('.toggle');
  if(!t) return;
  var id = t.getAttribute('data-target');
  var el = document.getElementById(id);
  if(el) el.classList.toggle('open');
  e.preventDefault();
});

/* CSS */
.more { display: none; }
.more.open { display: block; }

Additional tips

• While debugging, open DevTools Console: look for ReferenceError or syntax errors and inspect the generated HTML for exact id/onclick values.
• Always escape database output (e.g., htmlspecialchars) to avoid XSS.
• Replace deprecated mysql_* code with mysqli or PDO and prepared statements for security and future compatibility.

This pattern makes the generated markup easy to inspect, avoids string-escaping pitfalls when echoing from PHP, and simplifies debugging if a toggle is not working.