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PrestaShop 9 errors

Call to undefined function each() when moving PrestaShop to PHP 8

PrestaShop 9 needs PHP 8.1 or newer, and PHP 8 removed each(), create_function() and other old functions. Modules written for PHP 5 or 7 stop with a fatal error.

The error
Call to undefined function each()
Removed in
PHP 8.0
Usually found in
Old modules, themes, overrides

What happened

PrestaShop 9 runs on PHP 8.1 to 8.4 (9.1 also on 8.5). A store coming from PrestaShop 1.7 often ran on PHP 7.x, so the upgrade changes PHP by a major version too. PHP 8.0 removed functions that had been deprecated for years. The most common ones in PrestaShop modules:

  • each(), used to walk through arrays
  • create_function(), used to build small callbacks
  • money_format(), used to format prices
  • get_magic_quotes_gpc(), used by old input filters

Each of them now ends with Call to undefined function ...(). PHP 8 is also stricter in other ways: for example, functions such as count() or strlen() given the wrong type throw an error instead of a warning, and implode() no longer accepts its arguments in reverse order.

The fix

The replacements are straightforward:

// each()
// Before
while (list($key, $value) = each($array)) { ... }
// After
foreach ($array as $key => $value) { ... }

// create_function()
// Before
usort($items, create_function('$a, $b', 'return $a["position"] - $b["position"];'));
// After
usort($items, function ($a, $b) { return $a['position'] - $b['position']; });

// money_format(): use the PrestaShop locale instead
$formatted = Context::getContext()->getCurrentLocale()->formatPrice($amount, $isoCode);

get_magic_quotes_gpc() always returned false in PHP 7.4, so the check around it can simply be removed, keeping the "false" branch.

Where else it hides

grep -rnw "each\|create_function\|money_format\|get_magic_quotes_gpc" --include=*.php modules/ themes/ override/

The search above finds the names; check each hit, because a method called each() on a collection object is fine. A full PHP 8 check is part of our free readiness check below, along with the PrestaShop changes.

Find every place like this before you upgrade

Where one removed call is, there are usually more. Our free PrestaShop 9 Readiness Check reads the code of every module, the theme and the overrides and lists each problem with its file and line. It only reads, nothing is changed.

Get the free check

Prefer not to fix it yourself? We upgrade stores to PrestaShop 9 for a fixed price. See the upgrade