PHP 二维数组按相同的元素分类

来源：互联网发布：数据库分组查询原理编辑：程序博客网时间：2024/05/16 14:00

原数组 按照group分类

array(8) {

  [0] => array(3) {    ["id"] => string(1) "1"    ["tag_name"] => string(3) "公"    ["group"] => string(1) "1"  }  [1] => array(3) {    ["id"] => string(1) "2"    ["tag_name"] => string(3) "母"    ["group"] => string(1) "1"  }  [2] => array(3) {    ["id"] => string(1) "3"    ["tag_name"] => string(9) "发情期"    ["group"] => string(1) "2"  }  [3] => array(3) {    ["id"] => string(1) "4"    ["tag_name"] => string(9) "未成年"    ["group"] => string(1) "2"  }  [4] => array(3) {    ["id"] => string(1) "5"    ["tag_name"] => string(6) "绝育"    ["group"] => string(1) "2"  }  [5] => array(3) {    ["id"] => string(1) "6"    ["tag_name"] => string(6) "白色"    ["group"] => string(1) "3"  }  [6] => array(3) {    ["id"] => string(1) "7"    ["tag_name"] => string(6) "花色"    ["group"] => string(1) "3"  }  [7] => array(3) {    ["id"] => string(1) "8"    ["tag_name"] => string(6) "黑色"    ["group"] => string(1) "3"  }}

foreach ($tags as $v) {        $res[$v['group']][] = $v;     }

把group当做键名 相同的group放入同一个group的数组

array(3) {  [1] => array(2) {    [0] => array(3) {      ["id"] => string(1) "1"      ["tag_name"] => string(3) "公"      ["group"] => string(1) "1"    }    [1] => array(3) {      ["id"] => string(1) "2"      ["tag_name"] => string(3) "母"      ["group"] => string(1) "1"    }  }  [2] => array(3) {    [0] => array(3) {      ["id"] => string(1) "3"      ["tag_name"] => string(9) "发情期"      ["group"] => string(1) "2"    }    [1] => array(3) {      ["id"] => string(1) "4"      ["tag_name"] => string(9) "未成年"      ["group"] => string(1) "2"    }    [2] => array(3) {      ["id"] => string(1) "5"      ["tag_name"] => string(6) "绝育"      ["group"] => string(1) "2"    }  }  [3] => array(3) {    [0] => array(3) {      ["id"] => string(1) "6"      ["tag_name"] => string(6) "白色"      ["group"] => string(1) "3"    }    [1] => array(3) {      ["id"] => string(1) "7"      ["tag_name"] => string(6) "花色"      ["group"] => string(1) "3"    }    [2] => array(3) {      ["id"] => string(1) "8"      ["tag_name"] => string(6) "黑色"      ["group"] => string(1) "3"    }  }}

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