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PHP器皿

Jun 13, 2016 pm 01:19 PM
arraybooleankeystate

PHP容器
每种语言的容器都不太一样,最起码名字不一样,不过有一个是一样的,就是Array~
Java是我目前见过最多容器类型的语言了~
PHP的弱类型特征,使得容器看起来很OO。


Array

boolean print_r($array); //用来输出数组,还有用while遍历打印
is_array()




create:array、range、list
$state[0] = "0";
$state[1] = "1";
$state[]  = "2";  //数字索引才能这么玩的
echo $state[0].$state[2];
//	长度无需提前定义,动态

$state["key"] = "value";
//	还可以使用字符串做下标,全对象的吗?


$array1 = array("OH" => "Ohio", "CA" => "California", "HI" => "Hawaii");
//	这不就是OC的Dictionary的创建方式么~




//  便利地创建有序数组
//  操作数据库时,听说就是用list来玩,可以一次读取多个对象



常用array函数
boolean in_array($tag, $array    [boolean]);//最后是否匹配类型
boolean array_key_exists(key, $array);


array array_keys($array, [$key]);  //可选参数的意思是?
array array_values($array);
key   array_search($value, $array, [boolean]); //可选,类型匹配?
array echo($array) =>返回当前的key-value

key key($array)   => 类似jdbc读取ResultSet
key next($array)  => 下一个
key prev($array)  => 上一个
key reset($array) => 指针回到开头
key end($array)   => 最后一个
key current($array) => 当前,但不移动指针,简直就和文件操作一个样子~


//  书上说很有用的一个函数,将数据传给函数,特附上例子
boolean array_walk($array, callback function,  [可选传入函数的第三个参数C]);

    //  fuck,函数接口是两个参数,也可以有第三个参数,对应C
    //  想改值就传指针~,PHP也有指针玩耶
    function sanitize_data(&$value, $key) {
        $value = strip_tags($value);
    }

    $ay['keyword'] = "yes";
    array_walk($ay['keyword'],"sanitize_data");

$array1 = array("OH","CA","NY","HI","CT");
$array3 = array("TX","MD","NE","OH","HI");
$intersection = array_intersect($array1, $array3);
print_r($intersection);


//P85,抄个名字~
array_reverse()逆置
array_flip()键值交换
count()
array_count_values()
array_unique()去除重复的值


排序竟然有那么多函数>
sort()
natsort()
natcasesort()
rsort()
asort()
array_multisort()
arsort()
ksort()
krsort()
usort()



//  合并、拆分、接合、分解
array_combine()
array_merge()
array_merge_recursive()
array_slice()
array_splice()
array_intersect()
array_intersect_assoc()
array_diff()
array_diff_assoc



array_rand()
shuffle()
array_sum()array_chunk()
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