Kite的筆記
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PHP Laravel 系列 - (4) 常見函式

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3k 5 分鐘

1. array_column

依照指定欄位名稱(key)取出陣列

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$records =[
	['id' => 1, 'first_name' => 'kite'],
	['id' => 2, 'first_name' => 'snow'],
	['id' => 3, 'first_name' => 'bubu'],    
];
    
print_r(array_column($records,'first_name'));

2. array_keys

回傳指定陣列的key 

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$records =[
	['id' => 1, 'first_name' => 'kite'],
	['id' => 2, 'first_name' => 'snow'],
	['id' => 3, 'first_name' => 'bubu'],    
];   
print_r(array_keys($records[0]));
/*
Array
(
	[0] => id
	[1] => first_name
)
*/

3. array_values

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$records =[
	['id' => 1, 'first_name' => 'kite'],
	['id' => 2, 'first_name' => 'snow'],
	['id' => 3, 'first_name' => 'bubu'],    
];  
print_r(array_values($records[0]));
/*
Array
(
	[0] => 1
	[1] => kite
)
*/
print_r(array_values($records));
/*
Array
(
	[0] => 0
	[1] => 1
	[2] => 2	
)
*/

4. array_map

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$newRecords = array_map(function($record){
                return $record['id'] = $record['id'] * 5;
              },$records);
print_r($newRecords);
/*
Array
(
    [0] => 5
    [1] => 10
    [2] => 15
)
*/

5. array_filter

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$newRecords = array_filter(
    $records,
    function($record){
         return $record['id'] >=2;
    }
);

print_r($newRecords);

6. array_push

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$num = [1,2,3,4];
array_push($nums,8);

7. array_pop

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$num = [1,2,3,4];
array_pop($num);

8. array_merge

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$person = ['id' => 5, 'name' => 'kite'];
$person = array_merge(
	$person,
	['name' => 'bubu', 'age' => 10]
);
/*
Array
(
    [id] => 5
    [name] => bubu
    [age] => 10
)
*/

9. asort

value排序

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$arr = ['d' =>'bubu' ,'c' => 'snow','b'=> 'kite' , 'a' =>'apple'];
sort($arr);
print_r($arr);
/*
Array
(
    [0] => apple
    [1] => bubu
    [2] => kite
    [3] => snow
)
*/

10. ksort

key排序

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$arr = ['d' =>'bubu' ,'c' => 'snow','b'=> 'kite' , 'a' =>'apple'];
ksort($arr);
print_r($arr);
/*
Array
(
    [0] => apple
    [1] => bubu
    [2] => kite
    [3] => snow
)
*/
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$people = ['john','tim','tim','kite'];
echo(array_search('kite',$people));
//3

12. array_unique

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$people = ['john','tim','tim','kite'];
print_r(array_unique($people));
/*
Array
(
    [0] => john
    [1] => tim
    [3] => kite
)
*/

13. array_sum

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$nums = [1,2,3,4,5,6,7,8,9,10];
print_r(array_sum($nums));

14. count

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$nums = [1,2,3,4,5,6,7,8,9,10];
echo(count($nums));