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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
<?php
$m = [1 => 20, 30 => 40, 98 => 99];
$m1 = [1 => 5, 37 => 42, 70 => 79, 80 => 99];
$keys = array_keys($m);
$keys1 = array_keys($m1);
$values = array_values($m);
$values1 = array_values($m1);
$n = count($keys);
$n1 = count($keys1);
for($i=0; $i<max($n, $n1); $i++){
$key = (isset($keys[$i])) ? $keys[$i] : 100;
$key1 = (isset($keys1[$i])) ? $keys1[$i] : 100;
$value = (isset($values[$i])) ? $values[$i] : $values1[$i];
$value1 = (isset($values1[$i])) ? $values1[$i] : $values[$i];
$res[min($key, $key1)] = max($value, $value1);
}
print_r ($res);