PHP除了数组中的空值
PHP去除数组中的空值
foreach( $arr as $k=>$v){ if( !$v ) unset( $arr[$k] ); }
呵呵以前都是这样写也挺美的

在网上闲逛的时候,看到人有提示用array_filter,觉得很吃惊。打开手册瞅了一下,发现自己一直就守着个宝山却不知道如何使用。
array_filter函数的功能是利用回调函数来对数组进行过滤,一直都以为用回调函数才能处理,却没有发现手册下面还有一句,如果没有回调函数,那么默认就是删除数组中值为false的项目。
例程:
$entry = array( 0 => 'foo', 1 => false, 2 => -1, 3 => null, 4 => '' ); print_r(array_filter($entry));
Array ( [0] => foo [2] => -1 )
看来,以后还是要多看手册啊……
就象array_slice一样也是个好东西。可惜以前从来没有注意过。
建议:PHP里面最重要的两章应该就是数组操作和字符串操作,这两章里面的函数都必须要熟练,其他的就等用的时候再查吧

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