home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
AmigActive 24
/
AACD 24.iso
/
AACD
/
Online
/
Epic4
/
share
/
epic
/
help
/
6_functions
/
isdigit
< prev
next >
Wrap
Text File
|
2001-03-21
|
881b
|
27 lines
Synopsis:
$isalpha(<text>)
$isdigit(<text>)
Technical:
These function test whether the first character in the given string is
an alphabetical character or a digit. Only the first character is
tested.
Practical:
These functions are useful for testing an input string to see whether it
is a number or a text string. One use for this might be to check if it
would be suitable input for $iptoname() or $nametoip(). Keep in mind
that only the first character is tested, so this isn't a reliable way
to see if the entire string is a number.
Returns:
"true" or "false" value if first character is a letter or a digit
Examples:
$isalpha(hello) returns true
$isalpha(2hello) returns false
$isdigit(123) returns true
$isdigit(2abc) returns true
$isdigit(a123) returns false