php array_map 内联匿名函数
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原文地址: http://stackoverflow.com/questions/17996690/
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array_map inline anonymous function
提问by B L Praveen
I tested inline anonymous function with array_maphere
我在这里测试了内联匿名函数array_map
and it worked but when I tried same with $user_metait is not working.
它起作用了，但是当我用$user_meta尝试相同时，它不起作用。
$user_meta = Array ( [interest] => Array ( [0] => Array ) [type] =>
Array ( [0] => Array ) [user_status] => Array ( [0] => deny)
[firstname] => Array ( [0] => ) [lastname] => Array ( [0] => B )
[email] => [email protected] )
$user_meta = array_map(function($a) { return $a[0]; },$user_meta);
"Parse error: syntax error, unexpected T_FUNCTION, expecting ')' in"
“解析错误：语法错误，意外的 T_FUNCTION，需要 ')'”
回答by Dat TT
I hope this will help:
我希望这个能帮上忙：
$user_meta = array_map(function ($a) { return $a[0]; }, $user_meta);
回答by Paul
There's nothing wrong with the array_mapline, but everything before it is wrong. That is the output of a print_rnot PHP code. Compare how you define the array in the two links you posted.
这array_map条线没有任何问题，但它之前的一切都是错误的。那是非print_rPHP 代码的输出。比较您在发布的两个链接中定义数组的方式。
回答by Hichem Benali
That's not an answer to your question, but since you want to return the first key of each sub-array, you can just use array_column.
这不是您的问题的答案，但由于您想返回每个子数组的第一个键，您可以使用array_column.
$user_meta = array_column($user_meta, 0);
