Online PHP editor | output for LYhH6

@ 2018-01-05T22:52:44Z

<?php
function numberOfPairs($a,$k){
    $a=array_count_values($a);  // enable use of the very fast isset() function and avoid iterating duplicates
    ksort($a);  // order so that only the lower values need to be iterated
    foreach($a as $num=>$occur){
        if(($double=$num*2)>=$k){ // we are at or past the middle
            if($double==$k && $occur>1) $result[]=[$num,$k-$num];  // addends are equal and 2 exist, store before break
            break;
        }elseif(isset($a[$k-$num])){  // matching addend found, store & continue
            $result[]=[$num,$k-$num];
        }
    }
    var_export($result);
}

$a = [6,6,3,9,3,5,1];
$k = 12;
numberOfPairs($a,$k);

Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0 - 8.5.1: array ( 0 => array ( 0 => 3, 1 => 9, ), 1 => array ( 0 => 6, 1 => 6, ), )
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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