Question: By PHP, how can I print the error if it's occurred when the user entered wrong value in FORM, like price should be numbers, not

By PHP, how can I print the error if it's occurred

By PHP, how can I print the error if it's occurred when the user entered wrong value in FORM, like price should be numbers, not letters, also name, city, address ets. should be not empty. So, if there is error in any field in the form, print that error like PLEASE INPUT PRICE, or, PLEASE CHOSE ONE ITEM, otherwise if there is no error print the data that the use entered

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