TalkPHP - is_numeric($X) V.S. ctype_digit($X) V.S. is

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- - is_numeric($X) V.S. ctype_digit($X) V.S. is_integer($X) (http://www.talkphp.com/absolute-beginners/3327-is_numeric-x-v-s-ctype_digit-x-v-s-is_integer-x.html)

Yoosha

09-06-2008 08:30 AM

is_numeric($X) V.S. ctype_digit($X) V.S. is_integer($X)

Hi,
What is difference between is_numeric($X) V.S. ctype_digit($X) V.S. is_integer($X)?
Tnx ;).

Salathe

09-06-2008 09:16 AM

The relevant PHP Manual pages (is_numeric, ctype_digit, is_integer) should provide a clear answer, but in short:

is_numeric checks if the argument has a numerical value (e.g. 123, "0xFF" [hexadecimal], 0123 [octal], "+012.345e6", 3.14 are all allowed)
ctype_digit checks if all of the characters in a string are digits (e.g. 12345 is ok, 3.14 is not [the decimal point is not a digit!])
is_integer (and is_int) checks if the argument is an integer (i.e. 23 is ok, "23" is not)

Yoosha

09-06-2008 11:26 AM

Very thanks. Resolved ;).

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