How to remove empty array elements in php
php去除空的数组元素的方法:可以利用array_filter函数来删除数组中的空元素,如【array_filter($array)】。array_filter函数通过用回调函数来过滤数组中的元素。
函数介绍:
array_filter() 函数用回调函数过滤数组中的元素。
该函数把输入数组中的每个键值传给回调函数。如果回调函数返回 true,则把输入数组中的当前键值返回给结果数组。数组键名保持不变。
(推荐教程:php视频教程)
代码实现:
<?php $array = array('a' => "abc", 'b' => "bcd",'c' =>"cde",'d' =>"def",'e'=>""); $b= array_filter($array); print_r($b); ?>
执行结果:
Array ( [a] => abc [b] => bcd [c] => cde [d] => def )
利用foreach或者while语法结构来删除数组中的空元素
代码实现:
<?php foreach( $arr as $k=>$v){ if( !$v ) unset( $arr[$k] ); } >
注意:这样的效率并不高。也曾经试过先将$arr转为对象,然后利用对象的特性来删除。因为foreach是将当前操作的数组进行copy,每操作一下foreach,都是copy了一个变量,页面里面如果有太多的foreach,会是一个很大的消耗。
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