Online PHP editor | output for eFs4Y

@ 2017-09-25T10:32:18Z

<?php

$arr =  [1, 2, 3, 4, 4, 1, 2, 5, 5, 11, 11];

sort($arr);

for($i = 0, $max = count($arr); $i < $max; $i++){

    // is single number last element in array?
    if($i == count($arr)-1)
        $singleNum = $arr[$i];

    // If adjacent elements the same, skip  
    if($i < count($arr)-1 && $arr[$i] == $arr[$i+1]){
        $i++;
    }
    else
    {
        // found single number.
        $singleNum = $arr[$i];
     }
}
var_dump($singleNum);

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: int(3)
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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