array_column() function in php
Get the last_name column from the recordset:
<?php
// 可能从数据库中返回数组
$a = array(
array(
'id' => 5698,
'first_name' => 'Peter',
'last_name' => 'Griffin',
),
array(
'id' => 4767,
'first_name' => 'Ben',
'last_name' => 'Smith',
),
array(
'id' => 3809,
'first_name' => 'Joe',
'last_name' => 'Doe',
)
);
$last_names = array_column($a, 'last_name');
print_r($last_names);
?>Output:
Array ( [0] => Griffin [1] => Smith [2] => Doe )
Definition and usage
array_column() Returns the value of a single column in the input array.
Syntax
array_column(array,column_key,index_key);
Parameters
Description
array Required. Specifies the multidimensional array (record set) to use.
column_key Required. The column whose value needs to be returned. Can be an integer index of a column of an index array, or a string key value of a column of an associative array. This parameter can also be NULL, in which case the entire array will be returned (very useful when used with the index_key parameter to reset the array key).
index_key Optional. The column that is the index/key of the returned array.
Technical details
Return value:
Returns an array whose value is the value of a single column in the input array.
Get the last_name column from the record set and use the corresponding "id" column as the key value:
<?php
// 可能从数据库中返回数组
$a = array(
array(
'id' => 5698,
'first_name' => 'Peter',
'last_name' => 'Griffin',
),
array(
'id' => 4767,
'first_name' => 'Ben',
'last_name' => 'Smith',
),
array(
'id' => 3809,
'first_name' => 'Joe',
'last_name' => 'Doe',
)
);
$last_names = array_column($a, 'last_name', 'id');
print_r($last_names);
?>Output:
Array ( [5698] => Griffin [4767] => Smith [3809] => Doe )
Complete PHP Array Reference Manual
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