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How does javascript-PHP refresh the page and submit the form repeatedly ??

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How does PHP solve repeated page refresh forms submission ?? What should I do ?? How does PHP solve repeated page refresh forms submission ?? What should I do ??

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How does PHP solve repeated page refresh forms submission ?? What should I do ??

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Add hash to judge

When rendering the page, use session to generate a hash value, and submit the hash value for comparison during submission. if the hash value is inconsistent, it is submitted again.

CheckToken

Just add version control. it is a simple function. for example, many java frameworks provide large php, such as the yii2 framework.

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