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//array_merge (ÇÛÎó1, ÇÛÎó2, ...);
$ar  = array("PHP");
$ar2 = array("CGI");

print_r(array_merge($ar, $ar2));

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$ar  = array("HP" => "PHP");
$ar2 = array("HP" => "CGI");
print_r(array_merge($ar, $ar2));

// ­¡ //
$ar  = array(0 => "PHP");
$ar2 = array(0 => "CGI");
print_r(array_merge($ar, $ar2));