06-19-2008
Quote:
Originally Posted by
dhanamurthy
Please modify the example
awk '{
key=substr($0,1,10)
key1=substr($0,1,21)
if(arr[key])
{
arr[key]=1
}
else
{
arr[key]=$0
}
}
END {for (i in arr) {print arr[i]} } ' file_name
dhanamurthy, thank you for your reply, but could you please specify how the array name "arr" was defined outside of awk snippet (in shell)?
and the $0 means every line from the file? so your statement key=substr($0,1,10) means the 1-10 characters of the lines in the file, but you use it like this arr[key], sorry I do not understand.
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LEARN ABOUT PHP
parse_str
PARSE_STR(3) 1 PARSE_STR(3)
parse_str - Parses the string into variables
SYNOPSIS
void parse_str (string $str, [array &$arr])
DESCRIPTION
Parses $str as if it were the query string passed via a URL and sets variables in the current scope.
Note
To get the current QUERY_STRING, you may use the variable $_SERVER['QUERY_STRING']. Also, you may want to read the section on vari-
ables from external sources.
Note
The magic_quotes_gpc setting affects the output of this function, as parse_str(3) uses the same mechanism that PHP uses to populate
the $_GET, $_POST, etc. variables.
PARAMETERS
o $str
- The input string.
o $arr
- If the second parameter $arr is present, variables are stored in this variable as array elements instead.
RETURN VALUES
No value is returned.
EXAMPLES
Example #1
Using parse_str(3)
<?php
$str = "first=value&arr[]=foo+bar&arr[]=baz";
parse_str($str);
echo $first; // value
echo $arr[0]; // foo bar
echo $arr[1]; // baz
parse_str($str, $output);
echo $output['first']; // value
echo $output['arr'][0]; // foo bar
echo $output['arr'][1]; // baz
?>
SEE ALSO
parse_url(3), pathinfo(3), http_build_query(3), get_magic_quotes_gpc(3), urldecode(3).
PHP Documentation Group PARSE_STR(3)