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Explanation of id=%d for SQL query statements in PHP

巴扎黑
Release： 2023-03-03 22:54:01
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Some of the SQL statements are written like this: 

'SELECT id FROM dbname WHERE xx_id = %d;', $bl['student_id']
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"xx_id = %d", where %d refers to taking a decimal number (d means decimal) , the content of the decimal number is the following $bl['student_id'].


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