How to get a specified column in an array in PHP (case)
This article mainly introduces how to obtain a specified column in an array in PHP. Interested friends can refer to it. I hope it will be helpful to everyone.
For a multi-dimensional array (taking a two-dimensional array as an example), it is often necessary to obtain one of its columns. For example, there are several pieces of user data, which is a two-dimensional array. Now we need to obtain the names of these users. , can be implemented in many ways:
$arr = array(
array(
'id'=>'101',
'name'=>'qu',
'age'=>28
),
array(
'id'=>'102',
'name'=>'you',
'age'=>24
),
array(
'id'=>'103',
'name'=>'zheng',
'age'=>22
),
array(
'id'=>'104',
'name'=>'zhu',
'age'=>23
)
);Method 1: Use PHP built-in function array_column() to implement
array array_column ( array $input , mixed $column_key [, mixed $index_key ] )
Execute the statement:
$result = array_column($arr,'name')； print_r($result);
The result is as follows:
Array ( [0] => qu [1] => you [2] => zheng [3] => zhu )
If the optional parameter index_key is specified, the value of this column in the input array will be used as the key to the corresponding value in the returned array.
$result = array_column($arr,'name','id'); print_r($result);
The results are as follows:
Array ( [101] => qu [102] => you [103] => zheng [104] => zhu )
Method 2: Use PHP built-in function array_map() to implement
array array_map ( callable $callback , array $arr1 [, array $... ] )
array_map() returns an array that contains all the items in arr1 The unit after the callback has been applied to the unit. The first parameter is a callback function, and the return value is an array. Each element of the array is processed by the callback function (callback).
First declare a processing function:
function get_val($arr){
return $arr['name'];
}Then act on the array_map() function:
Array ( [0] => qu [1] => you [2] => zheng [3] => zhu )
$result = array_map(function($v){
return $v['name'];
},$arr);PHP gets the specified value position in the array
PHP method to get a specified column in the array
How does js get an array and process a php array
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