Online PHP editor | output for Ea2RV

@ 2015-11-26T21:56:08Z

<?php

function split_preg($str) {
    return preg_split('//u', $str, -1);     
}

function getFormattedString($str) {
    return implode('', explode(' ', mb_strtolower($str, 'UTF-8')));
}

function getOddLengthPalindromeArray($str) {
    
    $result = [];
    $l = 0;
    $r = -1;
    
    var_dump(split_preg($str));
    
    for ($i = 0, $n = mb_strlen($str, 'UTF-8'); $i < $n; $i++) {
        $k = ($i > $r ? 1 : min($result[$l + $r - $i], $r - $i));
        echo $str[$i - $k];
        while ($i - $k >= 0 && $i + $k < $n && $str[$i - $k] == $str[$i + $k]) {
            $k++;
        }
        $result[$i] = $k;
        if ($i + $k - 1 > $r) {
            $l = $i - $k + 1;
            $r = $i + $k - 1;
        }
    }
    
    return $result;
}

function getEvenLengthPalindromeArray($str) {
    
    $result = [];
    $l = 0;
    $r = -1;
    
    for ($i = 0, $n = mb_strlen($str, 'UTF-8'); $i < $n; $i++) {
        $k = ($i > $r ? 0 : min($result[$l + $r - $i - 1], $r - $i));
        while ($i - $k >= 0 && $i + $k + 1 < $n && $str[$i - $k] == $str[$i + $k + 1]) {
            $k++;
        }
        $result[$i] = $k;
        if ($i + $k > $r) {
            $l = $i - $k + 1;
            $r = $i + $k;
        }
    }
    
    return $result;
}

$formattedString = getFormattedString("Аргентина манит негра");
$oddPalindromeArray = getOddLengthPalindromeArray($formattedString);
$evenPalindromeArray = getEvenLengthPalindromeArray($formattedString);

$maxOddValue = max($oddPalindromeArray);
$maxEvenValue = max($evenPalindromeArray);
$maxOddPalindromeLength = $maxOddValue * 2 - 1;
$maxEvenPalindromeLength = $maxEvenValue * 2;

if ($maxOddPalindromeLength > $maxEvenPalindromeLength && $maxOddValue !== 1) {
    $maxOddKey = array_search($maxOddValue, $oddPalindromeArray);
    var_dump($oddPalindromeArray);
    //var_dump(mb_substr($formattedString, $maxOddKey - $maxOddValue + 1, $maxOddPalindromeLength, 'UTF-8'));
} elseif ($maxOddValue * 2 - 1 < $maxEvenValue * 2 && $maxEvenValue !== 0) {
    $maxEvenKey = array_search($maxEvenValue, $evenPalindromeArray);
    var_dump(mb_substr($formattedString, $maxEvenKey - $maxEvenValue, $maxEvenPalindromeLength, 'UTF-8'));
} else {
    var_dump($formattedString[0]);
}

Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: array(21) { [0]=> string(0) "" [1]=> string(2) "а" [2]=> string(2) "р" [3]=> string(2) "г" [4]=> string(2) "е" [5]=> string(2) "н" [6]=> string(2) "т" [7]=> string(2) "и" [8]=> string(2) "н" [9]=> string(2) "а" [10]=> string(2) "м" [11]=> string(2) "а" [12]=> string(2) "н" [13]=> string(2) "и" [14]=> string(2) "т" [15]=> string(2) "н" [16]=> string(2) "е" [17]=> string(2) "г" [18]=> string(2) "р" [19]=> string(2) "а" [20]=> string(0) "" } �ар��нт��array(19) { [0]=> int(1) [1]=> int(1) [2]=> int(1) [3]=> int(1) [4]=> int(1) [5]=> int(2) [6]=> int(1) [7]=> int(2) [8]=> int(1) [9]=> int(1) [10]=> int(1) [11]=> int(1) [12]=> int(1) [13]=> int(2) [14]=> int(1) [15]=> int(2) [16]=> int(1) [17]=> int(2) [18]=> int(1) }
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 array(21) { [0]=> string(0) "" [1]=> string(2) "а" [2]=> string(2) "р" [3]=> string(2) "г" [4]=> string(2) "е" [5]=> string(2) "н" [6]=> string(2) "т" [7]=> string(2) "и" [8]=> string(2) "н" [9]=> string(2) "а" [10]=> string(2) "м" [11]=> string(2) "а" [12]=> string(2) "н" [13]=> string(2) "и" [14]=> string(2) "т" [15]=> string(2) "н" [16]=> string(2) "е" [17]=> string(2) "г" [18]=> string(2) "р" [19]=> string(2) "а" [20]=> string(0) "" } �ар��нт��array(19) { [0]=> int(1) [1]=> int(1) [2]=> int(1) [3]=> int(1) [4]=> int(1) [5]=> int(2) [6]=> int(1) [7]=> int(2) [8]=> int(1) [9]=> int(1) [10]=> int(1) [11]=> int(1) [12]=> int(1) [13]=> int(2) [14]=> int(1) [15]=> int(2) [16]=> int(1) [17]=> int(2) [18]=> int(1) }
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.21, 7.0.0 - 7.0.20: array(21) { [0]=> string(0) "" [1]=> string(2) "а" [2]=> string(2) "р" [3]=> string(2) "г" [4]=> string(2) "е" [5]=> string(2) "н" [6]=> string(2) "т" [7]=> string(2) "и" [8]=> string(2) "н" [9]=> string(2) "а" [10]=> string(2) "м" [11]=> string(2) "а" [12]=> string(2) "н" [13]=> string(2) "и" [14]=> string(2) "т" [15]=> string(2) "н" [16]=> string(2) "е" [17]=> string(2) "г" [18]=> string(2) "р" [19]=> string(2) "а" [20]=> string(0) "" } Notice: Uninitialized string offset: -1 in /in/Ea2RV on line 21 ар��нт��array(19) { [0]=> int(1) [1]=> int(1) [2]=> int(1) [3]=> int(1) [4]=> int(1) [5]=> int(2) [6]=> int(1) [7]=> int(2) [8]=> int(1) [9]=> int(1) [10]=> int(1) [11]=> int(1) [12]=> int(1) [13]=> int(2) [14]=> int(1) [15]=> int(2) [16]=> int(1) [17]=> int(2) [18]=> int(1) }

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