向多维数组PHP追加值
我在PHP中有一个多维数组,如下所示:向多维数组PHP追加值,php,arrays,multidimensional-array,append,Php,Arrays,Multidimensional Array,Append,我在PHP中有一个多维数组,如下所示: Array ( [0] => Array ( [background] => https://example.com/image.jpg [description] => Example text [url] => https://example.com ) [1] => Array ( [background] =>
Array
(
[0] => Array
(
[background] => https://example.com/image.jpg
[description] => Example text
[url] => https://example.com
)
[1] => Array
(
[background] => https://example.com/image.jpg
[description] => Example text
[url] => https://example.com
)
)
我想循环遍历这个数组,并将相同的参数附加到两个url
键。我尝试通过一个带有双foreach循环的函数来实现这一点,并成功地附加了参数,但返回带有更新值的数组时遇到了问题
以下是我尝试过的:
呼叫
$array = append_field($array, 'url', '?parameter=test');
功能
function append_field($array, $field, $parameter)
{
foreach ($array as $inner_array) :
foreach ($inner_array as $key => $append) :
if ($key == $field) :
$append .= $parameter;
endif;
endforeach;
endforeach;
return $array;
}
您需要在两个foreach循环中将数组值作为引用传递,以便能够写入它们。否则,您将对值的副本进行迭代 参考: 但您也可以在不使用引用的情况下执行此操作,这一次是通过写入包含两个键的完整数组路径:
function append_field($array, $field, $parameter)
{
foreach ($array as $i => $inner_array) :
foreach ($inner_array as $key => $append) :
if ($key == $field) :
$array[$i][$key] .= $parameter;
endif;
endforeach;
endforeach;
return $array;
}
换一行就行了
$append .= $parameter;
对此
$inner_array[$key] = $append.$parameter
和
foreach($array as$internal\u array):
到foreach($array as&$internal\u array):
其他一些方法,例如使用
$inner_array[$key] = $append.$parameter
[akshay@localhost tmp]$ cat test.php
<?php
$arr = array(
array(
'background'=>'https://example.com/image.jpg',
'description'=>'Example text',
'url'=>'https://example.com'
),
array(
'background'=>'https://example.com/image.jpg',
'description'=>'Example text',
'url'=>'https://example.com'
),
);
$append = array('url'=>'?parameter=test');
print_r(
array_map(function($item) use ($append) {foreach($append as $k => $v){ if(isset($item[$k]))$item[$k].=$v;}return $item;}, $arr )
);
?>
[akshay@localhost tmp]$ php test.php
Array
(
[0] => Array
(
[background] => https://example.com/image.jpg
[description] => Example text
[url] => https://example.com?parameter=test
)
[1] => Array
(
[background] => https://example.com/image.jpg
[description] => Example text
[url] => https://example.com?parameter=test
)
)