Fixed fatal error

[girishpanchal30]

Summary

Used wp_unslash instead of stripslashes to remove the slashes.

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• I have written a test and included it in this PR
• I have run all tests and they pass
• The code passes when running the PHP CodeSniffer
• Code meets WordPress Coding Standards for PHP, HTML, CSS and JS
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Closes #617

[pirate-bot]

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Pull request overview

Replaces stripcslashes() calls in Engine::get_field_prices() with wp_unslash() so array-shaped posted PPOM field values (e.g. checkboxes/multi-selects) no longer trigger a TypeError on PHP 8, fixing the site-breaking fatal reported in #617. wp_unslash() recursively handles strings and arrays, matching the WordPress-standard unslashing pattern already used elsewhere in this codebase (e.g. CartHandler.php:409, ProductHandler.php:220).

Changes:

• Use wp_unslash() for the per-field posted $value normalization in get_field_prices().
• Use wp_unslash() for the bulkquantity field_meta['options'] JSON decode.
• Use wp_unslash() for select/radio and checkbox option-value comparisons.

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