php实现快速对二维数组某一列进行组装的方法小结

本文实例总结了php实现快速对二维数组某一列进行组装的方法。分享给大家供大家参考,具体如下:

问题:

比如我二维数组是这样的:

$user = array(
 "0"=> array("id"=>100,"username"=>"a1"),
 "1"=> array("id"=>101,"username"=>"a2"),
 "2"=> array("id"=>102,"username"=>"a3"),
 "3"=> array("id"=>103,"username"=>"a4"),
 "4"=> array("id"=>104,"username"=>"a5"),
)

如何快速的获取所有id组成的ids字符串,比如$ids="100,101,102,103,104"; 再者如果我有条件的组装,比如id!=103等这样的,除了循环处理外有没有比较方便快速的方法?

解决方法:

$user = array(
 "0"=> array("id"=>100,"username"=>"a1"),
 "1"=> array("id"=>101,"username"=>"a2"),
 "2"=> array("id"=>102,"username"=>"a3"),
 "3"=> array("id"=>103,"username"=>"a4"),
 "4"=> array("id"=>104,"username"=>"a5"),
);
/**
* @param array $array 数组
* @param string $k 要获取值的key
* @param array $rm 要去除的数据
* */
function array_get_v($array, $k, $rm)
{ 
 if (!trim($k)) return false;
 preg_match_all("/"$k":(d+)/", json_encode($array), $res);
 $res = array_diff($res[1],$rm);
 return implode(",",$res);
}
print_r(array_get_v($user, "id",array(101)));

运行结果:

100,102,103,104

补充方法:

例1:

$user = array(
"0" => array("id" => 100, "username" => "a1"),
"1" => array("id" => 101, "username" => "a2"),
"2" => array("id" => 102, "username" => "a3"),
"3" => array("id" => 103, "username" => "a4"),
"4" => array("id" => 104, "username" => "a5"),
);
array_walk($user, function($v, $k) use(&$ids){
 $ids[$k] = $v["id"];
});
echo implode(",", $ids);

运行结果:

100,101,102,103,104

例2:

<?php
function process($v){
 //如果要加限制条件,在这里加入即可
 if(isset($v["id"]))
  return $v["id"];
}
$user = array(
 "0" => array("id" => 100, "username" => "a1"),
 "1" => array("id" => 101, "username" => "a2"),
 "2" => array("id" => 102, "username" => "a3"),
 "3" => array("id" => 103, "username" => "a4"),
 "4" => array("id" => 104, "username" => "a5"),
);
$aUser = array_map("process", $user);
echo implode(",", $aUser);

运行结果:

100,101,102,103,104

更多关于PHP相关内容感兴趣的读者可查看本站专题:《PHP数组(Array)操作技巧大全》、《php排序算法总结》、《PHP数据结构与算法教程》、《php程序设计算法总结》、《php字符串(string)用法总结》及《PHP常用遍历算法与技巧总结》

希望本文所述对大家PHP程序设计有所帮助。