php数组合并array_merge()函数

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<?php

// 把两个数组合并为一个数组：

$a1=array("red","green");
$a2=array("blue","yellow");
$a3 = array_merge($a1,$a2);
print_r($a3);

结果：Array ( [0] => red [1] => green [2] => blue [3] => yellow ) 

?>

<?php

// 将两个关联数组合并为一个数组：

$a1=array("a"=>"red","b"=>"green");
$a2=array("c"=>"blue","b"=>"yellow");
print_r(array_merge($a1,$a2));

结果：Array ( [a] => red [b] => yellow [c] => blue ) 

?>

<?php

// 仅使用一个带有整数键名的数组参数：

$a=array(3=>"red",4=>"green");
print_r(array_merge($a));

结果：Array ( [0] => red [1] => green ) 

?>