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Avoiding the preg_replace() /e Modifier in PHP

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After upgrading PHP, some scripts such as those used in old Drupal systems may report an error on preg_replace() that "the /e modifier is no longer supported" due to the modifier's deprecation and removal for being a security risk. Replace it with preg_replace_callback() to solve the problem.

==========

1. Find the preg_replace() function.

preg_replace ("/".$pattern."/e", $replacement, $subject);

2. Convert it to the preg_replace_callback() function as shown.

preg_replace_callback("/".$pattern."/",
        function ($args) { return nameOfCallback($args); },
        $subject
);

==========

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