09-06-2008, 10:16 AM
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#2 (permalink)
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Moderateur
Join Date: Apr 2007
Posts: 701
Thanks: 2
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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)
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is_numeric($X) V.S. ctype_digit($X) V.S. is_integer($X)
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