1.array_splice()函数删除的话，数组的索引值也变化了。
例：
<?php $arr = array(‘a‘,‘b‘,‘c‘,‘d‘); array_splice($arr,1,1); print_r($arr); ?> |
结果是：
Array ( [0] => a [1] => c [2] => d )
2.unset()函数删除的话，数组的索引值没有变化。
例：
<?php $arr = array(‘a‘,‘b‘,‘c‘,‘d‘);unset($arr[1]);print_r($arr);?> |
结果是：
Array ( [0] => a [2] => c [3] => d )
3.array_filter ( array $input [, callable $callback = "" ] )
array_filter()删除数组中的空
例：
<?php $array = (‘a‘ => "abc", ‘b‘ => "bcd",‘c‘ =>"cde",‘d‘ =>"def",‘e‘=>""); array_filter($array); echo "<pre>"; print_r($array);?> |
结果：
Array (
[a] => abc
[b] => bcd
[c] => cde
[d] => def
)
<?php
function odd($var)
{
// returns whether the input integer is odd
return($var & 1);
}
function even($var)
{
// returns whether the input integer is even
return(!($var & 1));
}
$array1 = array("a"=>1, "b"=>2, "c"=>3, "d"=>4, "e"=>5);
$array2 = array(6, 7, 8, 9, 10, 11, 12);
echo "Odd :\n";
print_r(array_filter($array1, "odd"));
echo "Even:\n";
print_r(array_filter($array2, "even"));
?>以上例程会输出：
Odd :
Array
(
[a] => 1
[c] => 3
[e] => 5
)
Even:
Array
(
[0] => 6
[2] => 8
[4] => 10
[6] => 12
)
array_splice() unset() array_filter 删除数组变量
原文：http://www.cnblogs.com/xiaoliu520/p/5117693.html