foreach遍歷數組，增長鍵值對，改變值

1、增長鍵值對

咱們從數據表裏面的查出來的數據字段，遠遠不能知足咱們返回的數據，須要在次基礎上增長一些必須的參數，那麼咱們就能夠用foreach遍歷數組‘&’地址傳遞來實現。

$arr=[

['name'=>'xiaoqian', 'sex' =>'女', 'age' =>'25'],
['name'=>'liuxin', 'sex' =>'男', 'age' =>'26']
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];

foreach ( k=>&$v ){

$v['address']='q';
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} var_dump($arr);

結果：

array (size=2)

0 =>

array (size=4)
  'name' => string 'xiaoqian' (length=8)
  'sex' => string '女' (length=3)
  'age' => string '25' (length=2)
  'address' => string 'q' (length=1)
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1 => &

array (size=4)
  'name' => string 'liuxin' (length=6)
  'sex' => string '男' (length=3)
  'age' => string '26' (length=2)
  'address' => string 'q' (length=1)
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2、改變值

$arr=[

['name'=>'xiaoqian', 'sex' =>'女', 'age' =>'25'],
['name'=>'liuxin', 'sex' =>'男', 'age' =>'26']
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];

foreach (k=>&$v){

if($v['sex']=='男'){
    $v['name']='劉';
}
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}

var_dump($arr); 結果：

array (size=2) 0 =>

array (size=3)
  'name' => string 'xiaoqian' (length=8)
  'sex' => string '女' (length=3)
  'age' => string '25' (length=2)
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1 => &

array (size=3)
  'name' => string '劉' (length=3)
  'sex' => string '男' (length=3)
  'age' => string '26' (length=2)
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