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Homephp教程php手册从数组中随机抽取一个或多个单元办法

 

从数组中随机抽取一个或多个单元办法,我们会用到array_rand () ,想从数组中取出一个或多个随机的单元时相当有用。它接受 input 作为输入数组和一个可选的参数 num_req,指明了你想取出多少个单元 - 如果没有指定,默认为 1。 如果你只取出一个,array_rand() 返回一个随机单元的键名,否则就返回一个包含随机键名的数组

$a=array("a"=>"dog","b"=>"cat","c"=>"horse");
print_r(array_rand($a,1));
?>

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