array_pop
功能：剔除数组最后一个元素，返回被剔除的元素内容
<?php
$stack = array("orange","banana","apple","1");
$last = array_pop($stack);
echo "<pre>";
print_r($stack);
print_r($last);
echo "</pre>";
/**结果
Array
(
[0] => orange
[1] => banana
[2] => apple
)
1
*/
array_push
功能：将一个多个单元压入数组末尾，返回之后的数组个数
<?php
$stack = array("orange","banana");
$count = array_push($stack,"apple","red","blue");
echo "<pre>";
print_r($stack);
print_r($count);
echo "</pre>";
/**结果
Array
(
[0] => orange
[1] => banana
[2] => apple
[3] => red
[4] => blue
)
5
*/
array_rand
功能：获取随机的键名
<?php
$input = array("orange","banana","apple","red","blue");
$rand = array_rand($input,2);;
print_r($rand);
$rand = array_rand($input,3);
print_r($rand);
/**结果
Array
(
[0] => 1
[1] => 4
)
Array
(
[0] => 0
[1] => 1
[2] => 3
)
*/
array_search
功能：查询数组中的内容，返回键值，如果有多个匹配，返回第一个匹配的内容
<?php
$array = array("blue"=>"b","red"=>"r","green","r");
$key = array_search('b', $array);
echo $key;
echo "<br>";
$key = array_search('r', $array);
echo $key;
echo "<br>";
/**结果
blue
red
*/
array_shift
功能：移除开头的元素，与array_pop相反
<?php
$fruit = array("milk","orange","banana","apple");
$top = array_shift($fruit);
print_r($top);
echo "<br>";
print_r($fruit);
/**结果
milk
Array ( [0] => orange [1] => banana [2] => apple )
*/
array_unique
功能：去除数组重复的元素，保留第一个出现的，包括键名和值
<?php
$input = array("a"=>"green","red","b"=>"green","blue","c"=>"red");
$result = array_unique($input);
print_r($result);
echo "<br>";
print_r($input);
/**结果
Array ( [a] => green [0] => red [1] => blue )
Array ( [a] => green [0] => red [b] => green [1] => blue [c] => red )
*/
array_slice
功能：从数组中取出部分元素
<?php
$input = array("a","b","c","d","e");
$output = array_slice($input,2);//第二个参数没有时，表示取到最后一个元素
print_r($output);
echo "<br>";
$output = array_slice($input,-2,1);//第二个参数是正数时，表示个数；倒数第一个是-1，倒数第二个是-2
print_r($output);
echo "<br>";
$output = array_slice($input,0,3);
print_r($output);
echo "<br>";
$output = array_slice($input,2,-1);//第二个参数是负数时，表示位置，取到哪一位，不包括本身
print_r($output);
echo "<br>";
$output = array_slice($input,2,-1,true);//第三个参数为true时，保留原有的键值
print_r($output);
echo "<br>";
/**结果
Array ( [0] => c [1] => d [2] => e )
Array ( [0] => d )
Array ( [0] => a [1] => b [2] => c )
Array ( [0] => c [1] => d )
Array ( [2] => c [3] => d )
*/
