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magento2 - How can i resolve Empty string supplied as input in DOMDocument::loadXML() in magento 2? - Magento Stack Exchange
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php - TFW you learn that trim(null) equals empty string in PHP. I´m starting to understand why people seem to dislike P - devRant
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Empty string for boolean converted to null even though database has default value. · Issue #17106 · yiisoft/yii2 · GitHub
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