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Chrome browser isset ($_post[' submit ') does not return ture

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Chrome browser under Isset ($_post[' submit ') does not return ture
Can be successful under IE, but not under Chrome, is it a bug in the browser itself?

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There's no problem with the code, how did you test it? What version of Chrome.
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You go to GG browser and see if you have GG developer tools.

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$_post[' submit1 ' can get to submit1 this string

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Note Cache
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Chrome is problematic, but use the value of the Submit button as much as possible. In addition, if you use JavaScript form.submit (), IE does not submit. It is recommended to use hidden variables.
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Direct print $_post See if there's any
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Direct print $_post See if there's any

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