PHP Search Related issues

PHP Search Problems
I want to do a search function, want to search the page after the search box to display the search keyword, that is, no matter how you click on the page after the next page or the previous page, to search for the keyword will be displayed in the search box
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1, or like Google, Baidu, such as with Get submitted
Parameters are above the link, the input box directly reads the variables on the link

2, or you define a variable stored in memory
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How do you get the search keyword to search the database, just get this keyword to display in the input box OK.

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