If PHP implements a custom formula, such as a question, it uses PHP to save the user-defined formula ($ a + $ B * 2-3 * $ c) to the mysql table, then, when the calculation is required, the formula is read from the table. However, after the formula is read, it cannot be used and is treated as a string. how can this problem be solved, the variable has been pre-configured before the formula is read. if you implement the custom formula
For example, you have used PHP to save the user-defined formula ($ a + $ B * 2-3 * $ c) to the mysql table, the formula is read from the table. However, after reading the formula, it cannot be used. it is treated as a string. how can this problem be solved? the variables have been pre-configured before the formula is read? share: More
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