Sort PHP array of string (line) with two substring

Question

I wanted to sort php array based on CRITICAL , WARNING ,INFO sub string and then CRITICAL , WARNING ,INFO sub array should be sorted again with the time stamp value contains in each line of string in acsending order. Basically at the end I need array to be sorted with CRITICAL 1st with time stamp sorted then WARNING and then INFO so on..

$keys = array_keys($eventinfo["message"]);
for ($i = 0; $i < count($keys); $i++) {
    $key = ($keys[$i]);
    $perNode = $eventinfo["message"][$key];
    $arrTmp = explode("\n", $perNode);
    $t = count($arrTmp);
    $tmp = 0;
    while ($t) {
        $t--;
        if ($arrTmp[$tmp] != "") {
            $cumltvArray[] = "<a href='#'>" . $key. "</a> : </br>".$arrTmp[$tmp];
        }
        $tmp++;
    }
}
$result_str = events_print($cumltvArray);
// $cumltvArray is the one which I am passing to events_print

$keys= (array_keys($eventinfo["message"])); for ( $i = 0; $i < count($keys); $i++ ){ $key = ($keys[$i]); $perNode= $eventinfo["message"][$key]; $arrTmp=explode("\n",$perNode); $t=count($arrTmp); $tmp = 0; while($t){ $t--; if($arrTmp[$tmp]!=""){ $cumltvArray[] ="<a href='#'>". $key."</a> : </br>".$arrTmp[$tmp]; } $tmp++; } } $result_str = events_print($cumltvArray); $cumltvArray is the one which I am passing to events_print — kkr
– kkr, Commented Nov 24, 2014 at 7:08
This question is not a good fit for Stack Overflow because it is Unclear and doesn't contain a minimal reproducible example. — mickmackusa
– mickmackusa ♦, Commented Oct 9, 2023 at 3:58

Community · Accepted Answer · 2017-05-23 11:57:55Z

1

First, define a function that turns the urgency of a line into a number.

function urgency($line)
{
    if (strpos($line, 'INFO') !== false) {
        return 1;
    } elseif (strpos($line, 'WARNING') !== false) {
        return 2;
    } elseif (strpos($line, 'CRITICAL') !== false) {
        return 3;
    }
    return 0;
}

Then, assuming each element of your array contains a line of the file, you need to apply a decorator to keep the sort stable; see also my earlier answer on the subject:

array_walk($array, function(&$element, $index) {
    $element = array($element, $index); // decorate
});

After applying the decorator, you sort the array; I'm using a stable comparison helper:

function stablecmp($fn)
{
    return function($a, $b) use ($fn) {
        if (($tmp = call_user_func($fn, $a[0], $b[0])) != 0) {
            return $tmp;
        } else {
            return $a[1] - $b[1];
        }
    };
}

usort($array, stablecmp(function($a, $b) {
    return urgency($b) - urgency($a);
}));

Finally, undecorate the array to produce the end result:

array_walk($array, function(&$element) {
    $element = $element[0];
});

edited May 23, 2017 at 11:57

CommunityBot

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answered Nov 24, 2014 at 6:56

Ja͢ck

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3 Comments

Bolli Over a year ago

Jack, could you explain the syntaxt of the last part of your code? The usort part. Never seen PHP written this way. What does function($a,$b) do? How does it this work? I also dont understand your return statement. Thanks in advance :)

Ja͢ck Over a year ago

@Bolli I'm using anonymous functions.

kkr Over a year ago

Thanks Jack stackoverflow.com/users/1338292/ja%cd%a2ck nice answer , can it be sorted with the time stamp contains in the line aswell with same complexity with recent time first in order of CRITICAL-->Warning-->INFO

Bhumi Shah · Accepted Answer · 2014-11-24 06:54:00Z

0

Getting CRITICAL on the sorted order

function my_cmp($a, $b){
 $pieces_a = explode("CRITICAL", $a);
 $pieces_b = explode("CRITICAL", $b);

 if(!isset($pieces_a[1]) && isset($pieces_b[1])) {
    return 1;
 }
 elseif(!isset($pieces_b[1]) && isset($pieces_a[1])) {
    return -1;
 }
 elseif(!isset($pieces_a[1]) && !isset($pieces_b[1])) {
    return 0;
 }
 return strcasecmp($pieces_a[1], $pieces_b[1]);
}
usort($arr, "my_cmp");

But this can only sort if the each line has non spaces I mean single word,.

Any other solution curious to know?

edited Nov 24, 2014 at 6:54

Bhumi Shah

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answered Nov 24, 2014 at 6:49

Jack

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