red , b => green , c => blue , d => yellow );$a2=array( e => red , f => green , g => blue );$res..."/>
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一、比較兩個(gè)數(shù)組之差:array_diff
例如:
$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
$a2=array("e"=>"red","f"=>"green","g"=>"blue");
$result=array_diff($a1,$a2);
print_r($result);
結(jié)果為:Array ( [d] => yellow )
二、比較兩個(gè)數(shù)組的交集:array_intersect
例如:
$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
$a2=array("e"=>"red","f"=>"green","g"=>"blue");
$result=array_intersect($a1,$a2);
print_r($result);
結(jié)果為:Array ( [a] => red [b] => green [c] => blue )
三、取出數(shù)組中的那些數(shù)據(jù):array_slice
array_slice默認(rèn)是不保留鍵名的。
使用array_slice函數(shù)要保留鍵名值,最后一個(gè)參數(shù)$preserve_keys設(shè)置為true即可。
例如:
$levels = array('a' => 1, 'b' =>2, 'c' => 3, 'd' => 4, 'f' => 5, 'g' => 6);
$firstLevels = array_slice($levels, 0, 5, true);
結(jié)果為:
$firstLevels = array('a' => 1, 'b' =>2, 'c' => 3, 'd' => 4, 'f' => 5);
四、合并數(shù)組:array_merge()
例如:
$a1=array("red","green");
$a2=array("blue","yellow");
print_r(array_merge($a1,$a2));
結(jié)果為:Array ( [0] => red [1] => green [2] => blue [3] => yellow )
五、取出二維數(shù)組中的某個(gè)字段:array_column()
例如:
$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);
結(jié)果為:
Array
(
[0] => Griffin
[1] => Smith
[2] => Doe
)
六、將數(shù)組一維數(shù)組分成二維數(shù)組: array_chunk()
例如:
$cars=array("Volvo","BMW","Toyota","Honda","Mercedes","Opel");
print_r(array_chunk($cars,2));
結(jié)果為:
Array (
[0] => Array (
[0] => Volvo
[1] => BMW
)
[1] => Array (
[0] => Toyota
[1] => Honda
)
[2] => Array (
[0] => Mercedes
[1] => Opel
)
)
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