PHP : Jquery/Ajax Form Submission (enctype="multipart/form-data" ). Why does 'contentType:False' cau

PHP : Jquery/Ajax Form Submission (enctype="multipart/form-data" ). Why does 'contentType:False' cause undefined index in PHP?
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PHP : Jquery/Ajax Form Submission (enctype="multipart/form-data" ). Why does 'contentType:False' cause undefined index in PHP?
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in cause Jquery/Ajax 'contentType:False' ). : Why does (enctype="multipart/form-data" Submission PHP? PHP undefined index Form