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null problem

Why do I use var_dump() to output an undefined variable? The result is not null, but an error is reported

girlgirl2658 days ago1315

reply all(3)I'll reply

  • phpcn_u15277

    phpcn_u152772017-08-14 16:50:09

    I am a beginner, please give me some advice

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  • phpcn_u15277

    phpcn_u152772017-08-14 16:49:49

    Undefined variable: 

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  • ringa_lee

    ringa_lee2017-08-14 16:43:10

    Can you tell me the specific error information

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