Sometimes we need to validate an input from client browser before we push the value into further proccess, here i share 3 simple functions to perform validation input from forms and or querrystrings

Validate Integer Value Using isNumeric function

the simple php function above will perform an integer validation input, the proccess is pretty simple, the if control structure will evaluate whether the argument value ($n) has the same type with itself after cast to integer (strval(intval($n))), the right part of if expression (strval(intval($n))) is a simple way to cast any type of variable into integer. Sample of usage:

Validate Float Value Using isFloat function

the simple php function above has same proccess with isNumeric function the difference is only the second part of if expression (strval(floatval($n))) which has function to cast the value of argument into floating point variable. Sample of usage:

Validate Characters Length Using isLength function

the php function above will perform a Length of characters validation, it takes 3 arguments which are (string_to_be_validate,minimum_length,maximum_length). Sample of usage: