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@ 2020-01-22T15:51:15Z

<?php

$args = array(
    'a' => array(
        'zebra' => 1,
    ),
    'b' => array(
        'zebra' => 0,
    ),
    'c' => array(
        'zebra' => 1,
    ),
    'd' => array(
        'zebra' => 0,
    ),
    'e' => array(
        'zebra' => 0,
    ),
);

$zeros = [];
$ones = [];

foreach($args as $let=>$arg){
    if ($arg['zebra'] === 1) {
        $ones[] = $let;
    } else if ($arg['zebra'] === 0) {
        $zeros[] = $let;
    }
}

$res = [];
 
    if (count($ones) > count($zeros)){
        foreach($ones as $ind=>$let){ 
            if (isset($zeros[$ind])) $res[$zeros[$ind]] = ['zebra' => 0]; 
            $res[$let]        = ['zebra' => 1];  
        }  
    } else if (count($zeros) > count($ones)){
        foreach($zeros as $ind=>$let){ 
            $res[$let]        = ['zebra' => 0];  
            if (isset($ones[$ind])) $res[$ones[$ind]] = ['zebra' => 1]; 
        }  
    }

print_r($res);

Output for 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 - 8.1.33, 8.2.0 - 8.2.30, 8.3.0 - 8.3.29, 8.4.1 - 8.4.14, 8.4.16, 8.5.0 - 8.5.1: Array ( [b] => Array ( [zebra] => 0 ) [a] => Array ( [zebra] => 1 ) [d] => Array ( [zebra] => 0 ) [c] => Array ( [zebra] => 1 ) [e] => Array ( [zebra] => 0 ) )
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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