Howdy folks,
I'm trying to craft a log file summarisation tool for an application that creates a lot of duplicate entries with only a different suffix to indicate point of execution. I thought I'd gotten close but I'm clearly missing something.
Here's a genericized version:
A text_file (infile_grocery.txt) with these contents.
Code:
milk skim fruit apple banana
milk skim fruit orange
milk skim fruit mango
milk skim fruit pomegranate
milk 2 percent fruit cherry tomato
milk 2 percent fruit peach
milk whole fruit pineapple
milk skim fruit strawberry raspberry
milk skim fruit strawberry rhubarb
milk whole fruit pineapple
What I'm hoping to get is:
Code:
milk skim fruit apple banana, orange, mango, pomegranate
milk 2 percent fruit cherry tomato, peach
milk whole fruit pineapple
milk skim fruit strawberry raspberry, strawberry rhubarb
milk whole fruit pineapple
The command line I've cooked up is:
Code:
sed -rn "{H;x;s|^(.+) fruit ([^\n]+)\n(.*)\1 fruit (.+)$|\1 fruit \2, \4|;x}; ${x;s/^\n//;p}" infile_grocery.txt
But the results I'm getting are:
Code:
milk skim fruit apple banana, mango, strawberry raspberry
milk skim fruit strawberry rhubarb
milk whole fruit pineapple
Clearly I'm skipping chunks of lines somehow but I've been staring at this too long and I can't see it. Anyone have any suggestions for me?
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Discussion started by: crombiecrunch
9 Replies
LEARN ABOUT PHP
each
EACH(3) 1 EACH(3)each - Return the current key and value pair from an array and advance the array cursorSYNOPSIS
array each (array &$array)
DESCRIPTION
Return the current key and value pair from an array and advance the array cursor.
After each(3) has executed, the array cursor will be left on the next element of the array, or past the last element if it hits the end of
the array. You have to use reset(3) if you want to traverse the array again using each.
PARAMETERS
o $array
- The input array.
RETURN VALUES
Returns the current key and value pair from the array $array. This pair is returned in a four-element array, with the keys 0, 1, key, and
value. Elements 0 and key contain the key name of the array element, and 1 and value contain the data.
If the internal pointer for the array points past the end of the array contents, each(3) returns FALSE.
EXAMPLES
Example #1
each(3) examples
<?php
$foo = array("bob", "fred", "jussi", "jouni", "egon", "marliese");
$bar = each($foo);
print_r($bar);
?>
$bar now contains the following key/value pairs:
Array
(
[1] => bob
[value] => bob
[0] => 0
[key] => 0
)
<?php
$foo = array("Robert" => "Bob", "Seppo" => "Sepi");
$bar = each($foo);
print_r($bar);
?>
$bar now contains the following key/value pairs:
Array
(
[1] => Bob
[value] => Bob
[0] => Robert
[key] => Robert
)
each(3) is typically used in conjunction with list(3) to traverse an array, here's an example:
Example #2
Traversing an array with each(3)
<?php
$fruit = array('a' => 'apple', 'b' => 'banana', 'c' => 'cranberry');
reset($fruit);
while (list($key, $val) = each($fruit)) {
echo "$key => $val
";
}
?>
The above example will output:
a => apple
b => banana
c => cranberry
Caution
Because assigning an array to another variable resets the original array's pointer, our example above would cause an endless loop
had we assigned $fruit to another variable inside the loop.
Warning
each(3) will also accept objects, but may return unexpected results. It's therefore not recommended to iterate though object proper-
ties with each(3).
SEE ALSO key(3), list(3), current(3), reset(3), next(3), prev(3), foreach, Object Iteration.
PHP Documentation Group EACH(3)