array_key_exists is deprecated with objects PHP 7.4 error PhpUnit 9.0.1. · Issue #20 · yiisoft/arrays · GitHub
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How to fix 'Warning: array_key_exists(): The First Argument Should Be Either a String or an Integer' error in PHP | SourceCodester
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How to fix 'Warning: array_key_exists(): The First Argument Should Be Either a String or an Integer' error in PHP | SourceCodester
GitHub - io-developer/php-keyget: Solves routine array actions: get value by key if exists or default; set key if not exists. PHP 5, 7
![How to fix 'Warning: array_key_exists(): The First Argument Should Be Either a String or an Integer' error in PHP | SourceCodester How to fix 'Warning: array_key_exists(): The First Argument Should Be Either a String or an Integer' error in PHP | SourceCodester](https://www.sourcecodester.com/sites/default/files/2023-08/php-warning-array_key_exists_solution3.png)