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Php Code for a Valid Number Besides working on numbers, is_numeric( ) can also be applied to numeric strings. Use is_numeric( ): if (is_numeric('five')) { /* false */ } if (is_numeric(5)) { /* true */ } if (is_numeric('5')) { /* true */ } if (is_numeric(-5)) { /* true */ } if (is_numeric('-5')) { /* true */ } It is often useful to determine where in the code output originates. Helpfully, is_numeric( ) properly parses decimal numbers, however, numbers with thousands separators, such as 5,100, cause is_numeric( ) to return false. To strip the thousands separators from your number before calling is_numeric( ) use str_replace( ): is_numeric(str_replace($number, ',', '')); To check if your number is a specific type, there are a variety of self-explanatorily named related functions: is_bool( ) , is_float( ) (or is_double( ) or is_real( ); they're all the same), and is_int( ) (or is_integer( ) or is_long( )).