How to prevent form resubmission when page is refreshed (F5 / CTRL+R)

How to prevent form resubmission when page is refreshed (F5 / CTRL+R)

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What's wrong with using $_REQUEST[]?

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Serializing and submitting a form with jQuery and PHP

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How to prevent multiple inserts when submitting a form in PHP?

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HTML - Form Submit Button Confirmation Dialog

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how to submit a form to another page in wordpress plugin

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A button to start php script, how?

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Avoiding form resubmit in php when pressing f5

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jQuery Submitting form Twice

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Radio Buttons with PHP Form Handling

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Unset post variables after form submission

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Send same inputs to different actions with one form

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Html: For Select multiple, only one value is submitted but .val() returns array of two values

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Prevent form from being submitted twice

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Hitting "enter" does not post form in IE8

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