Extract the information you want from a two-dimensional PHP array

The original two-dimensional array, a lot of information

Array (size=16) ' id ' = = String ' "(length=2) ' user_id ' = ' + String '" (length=2) ' doc_id ' = = String ' 121 ' (l ength=3) ' time ' = = String ' 2015-08-07 11:41:28 ' (length=19) ' email ' = = String ' yintx_123@163.com ' (length=17) ' Us Ername ' = = String ' Sun-policy ' (length=6) ' password ' + string ' 18BC4215375CD9773A5F572934018BFA ' (length=32) ' phone ' =&gt ; String ' 456181687 ' (length=9) ' category ' = = String ' 2 ' (length=1) ' company ' = = String ' Dong Wu Group ' (length=12) ' Name ' = > String ' Sun ' (length=6) ' position ' + string ' I was killed by the President ' (length=21) ' address ' and string ' Jian Kang ' (length=6) ' state  ' = = String ' 3 ' (length=1) ' Other_field ' + null ' authentication ' = = String ' 1 ' (length=1) array (size=16) ' ID ' = = String ' (length=2) ' user_id ' = ' + String ' (length=2) ' doc_id ' = = String ' 121 ' (length=3) ' Time ' =&gt ; String ' 2015-08-11 04:27:08 ' (length=19) ' email ' + string ' yintx_121@163.com ' (length=17) ' username ' + string ' Liu Seal ' (length=6) ' PassWord ' = ' + string ' 18BC4215375CD9773A5F572934018BFA ' (length=32) ' phone ' = ' + String ' (length=0) ' category ' = = St Ring ' 0 ' (length=1) ' company ' = = String ' Shuhan ' (length=6) ' name ' = + string ' Liu Feng ' (length=6) ' position ' = = string   ' Spare tire ' (length=6) ' address ' = = String ' Jingzhou arthas ' (length=15) ' state ' = = String ' 2 ' (length=1) ' other_field ' = null ' Authentication ' = String ' 1 ' (length=1)

Now only need to email,company,name,phone these four values, how to operate?

array (size=16)  'email' => string 'yintx_123@163.com' (length=17)  'phone' => string '456181687' (length=9)  'company' => string '东吴集团' (length=12)  'name' => string '孙策' (length=6)

array (size=16)  'email' => string 'yintx_121@163.com' (length=17)  'phone' => string '' (length=0)  'company' => string '蜀汉' (length=6)  'name' => string '刘封' (length=6)

Reply content:

The original two-dimensional array, a lot of information

Array (size=16) ' id ' = = String ' "(length=2) ' user_id ' = ' + String '" (length=2) ' doc_id ' = = String ' 121 ' (l ength=3) ' time ' = = String ' 2015-08-07 11:41:28 ' (length=19) ' email ' = = String ' yintx_123@163.com ' (length=17) ' Us Ername ' = = String ' Sun-policy ' (length=6) ' password ' + string ' 18BC4215375CD9773A5F572934018BFA ' (length=32) ' phone ' =&gt ; String ' 456181687 ' (length=9) ' category ' = = String ' 2 ' (length=1) ' company ' = = String ' Dong Wu Group ' (length=12) ' Name ' = > String ' Sun ' (length=6) ' position ' + string ' I was killed by the President ' (length=21) ' address ' and string ' Jian Kang ' (length=6) ' state  ' = = String ' 3 ' (length=1) ' Other_field ' + null ' authentication ' = = String ' 1 ' (length=1) array (size=16) ' ID ' = = String ' (length=2) ' user_id ' = ' + String ' (length=2) ' doc_id ' = = String ' 121 ' (length=3) ' Time ' =&gt ; String ' 2015-08-11 04:27:08 ' (length=19) ' email ' + string ' yintx_121@163.com ' (length=17) ' username ' + string ' Liu Seal ' (length=6) ' PassWord ' = ' + string ' 18BC4215375CD9773A5F572934018BFA ' (length=32) ' phone ' = ' + String ' (length=0) ' category ' = = St Ring ' 0 ' (length=1) ' company ' = = String ' Shuhan ' (length=6) ' name ' = + string ' Liu Feng ' (length=6) ' position ' = = string   ' Spare tire ' (length=6) ' address ' = = String ' Jingzhou arthas ' (length=15) ' state ' = = String ' 2 ' (length=1) ' other_field ' = null ' Authentication ' = String ' 1 ' (length=1)

Now only need to email,company,name,phone these four values, how to operate?

array (size=16)  'email' => string 'yintx_123@163.com' (length=17)  'phone' => string '456181687' (length=9)  'company' => string '东吴集团' (length=12)  'name' => string '孙策' (length=6)

array (size=16)  'email' => string 'yintx_121@163.com' (length=17)  'phone' => string '' (length=0)  'company' => string '蜀汉' (length=6)  'name' => string '刘封' (length=6)

$keys = Array (email,company,name,phone);
foreach under the original array, if (! In_array ($key, $keys)), unset off

$result = array_map(function($value){  return ['email'=>$value['email'],'company'=>$value['company'],'name'=>$value['name'],'phone'=>$value['phone']];}, $arr);var_dump($result);

  
    array(        'id' => 1,        'name' => 'Apache',        'version' => '2.4'    ),    1 => array(        'id' => 2,        'name' => 'Nginx',        'version' => '1.8'    ));$new = array();foreach($arr as $k => $v) {    $new[$k]['name'] = $v['name'];    $new[$k]['version'] = $v['version'];}print_r($new);//输出:Array(    [0] => Array        (            [name] => Apache            [version] => 2.4        )    [1] => Array        (            [name] => Nginx            [version] => 1.8        ))

A way to use it array_walk() .

$array = array(    array(        'id' => 1,        'name' => 'xiaoming',        'age' => 14,        'addr' => 'beijing',    ),    array(        'id' => 2,        'name' => 'xiaohong',        'age' => 18,        'addr' => 'tianjin',    ),);function unEvent(&$value) {    unset($value['age']);    unset($value['addr']);}array_walk($array, 'unEvent');var_dump($array);

