06-02-2011
I just added something to the text file, please reread it,
It seems your understanding is correct,
when N-N-N-N-N is found it should be replaced and each found instance with the said up there.
that means:
first instance N-N-N-N-N replace with 1234
second instance N-N-N-N-N replace ALSO with 1234
third instance N-N-N-N-N replace with 5678
fourth instance N-N-N-N-N replace ALSO with 5678
and so forth...
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LEARN ABOUT PHP
ctype_alnum
CTYPE_ALNUM(3) 1 CTYPE_ALNUM(3)
ctype_alnum - Check for alphanumeric character(s)
SYNOPSIS
bool ctype_alnum (string $text)
DESCRIPTION
Checks if all of the characters in the provided string, $text, are alphanumeric.
PARAMETERS
o $text
- The tested string.
RETURN VALUES
Returns TRUE if every character in $text is either a letter or a digit, FALSE otherwise.
EXAMPLES
Example #1
A ctype_alnum(3) example (using the default locale)
<?php
$strings = array('AbCd1zyZ9', 'foo!#$bar');
foreach ($strings as $testcase) {
if (ctype_alnum($testcase)) {
echo "The string $testcase consists of all letters or digits.
";
} else {
echo "The string $testcase does not consist of all letters or digits.
";
}
}
?>
The above example will output:
The string AbCd1zyZ9 consists of all letters or digits.
The string foo!#$bar does not consist of all letters or 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_alpha(3), ctype_digit(3), setlocale(3).
PHP Documentation Group CTYPE_ALNUM(3)