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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
<?php
$m1 = [1=>6, 8 => 11, 20 => 30, 33 => 35 ,66 => 80];
$m = [0=>5, 6 => 25, 26 =>28, 80 => 95];
$m_keys = array_keys($m);
$m1_keys = array_keys($m1);
$result = [];
for ($i = 0; $i < max(count($m_keys), count($m1_keys)); $i++)
{
$result[!isset($m_keys[$i]) ? $m1_keys[$i] : (!isset($m1_keys[$i]) ? $m_keys[$i] : min($m_keys[$i], $m1_keys[$i]))] =
!isset($m_keys[$i]) ? $m1[$m1_keys[$i]] : (!isset($m1_keys[$i]) ? $m[$m_keys[$i]] : max($m[$m_keys[$i]], $m1[$m1_keys[$i]]));
}
print_r($result);