08-27-2014
This is all related to a small part of another thread:
Replace Special Character With Next Present Byte
This is a very specific
awk (not shell) issue where exactly two characters are to be converted to a number using base 10 if both characters are decimal digits and using base 16 if one or both characters are hexadecimal digits.
I'm closing this thread, because the issue was resolved in the other thread.
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LEARN ABOUT PHP
ctype_xdigit
CTYPE_XDIGIT(3) 1 CTYPE_XDIGIT(3)
ctype_xdigit - Check for character(s) representing a hexadecimal digit
SYNOPSIS
bool ctype_xdigit (string $text)
DESCRIPTION
Checks if all of the characters in the provided string, $text, are hexadecimal 'digits'.
PARAMETERS
o $text
- The tested string.
RETURN VALUES
Returns TRUE if every character in $text is a hexadecimal 'digit', that is a decimal digit or a character from [A-Fa-f] , FALSE otherwise.
EXAMPLES
Example #1
A ctype_xdigit(3) example
<?php
$strings = array('AB10BC99', 'AR1012', 'ab12bc99');
foreach ($strings as $testcase) {
if (ctype_xdigit($testcase)) {
echo "The string $testcase consists of all hexadecimal digits.
";
} else {
echo "The string $testcase does not consist of all hexadecimal digits.
";
}
}
?>
The above example will output:
The string AB10BC99 consists of all hexadecimal digits.
The string AR1012 does not consist of all hexadecimal digits.
The string ab12bc99 consists of all hexadecimal digits.
NOTES
Note
If an integer between -128 and 255 inclusive is provided, it is interpreted as the ASCII value of a single character (negative val-
ues have 256 added in order to allow characters in the Extended ASCII range). Any other integer is interpreted as a string contain-
ing the decimal digits of the integer.
SEE ALSO
ctype_digit(3).
PHP Documentation Group CTYPE_XDIGIT(3)