[英]Append value to multidimensional array PHP
我在PHP中有一個多維數組,顯示為:
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
)
)
我想循環遍歷此數組並將相同的參數附加到兩個url
鍵。 我嘗試通過帶有雙foreach循環的函數執行此操作,並且能夠成功附加參數,但是我無法返回具有更新值的數組。
這是我嘗試過的:
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 $array;
}
您需要在兩個foreach循環中將數組值作為引用傳遞,以便能夠寫入它們。 否則,您將迭代值的副本。
參考: http : //php.net/manual/en/language.references.php
function append_field($array, $field, $parameter)
{
foreach ($array as &$inner_array) :
foreach ($inner_array as $key => &$append) :
if ($key == $field) :
$append .= $parameter;
endif;
endforeach;
endforeach;
return $array;
}
但是你也可以在沒有引用的情況下完成它,這次是通過寫入包括兩個鍵的完整數組路徑:
function append_field($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;
}
只需改變這一行
$append .= $parameter;
對此
$inner_array[$key] = $append.$parameter
和foreach ($array as $inner_array):
to foreach ($array as &$inner_array) :
更多方法,以實現相同的結果,例如使用array_map()
[akshay@localhost tmp]$ 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;}, $arr )
);
?>
輸出:
[akshay@localhost tmp]$ 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
)
)
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