介绍几个array库的新函数
我们手头的PHP资料不多,大家是不是都有一份php4gb.chm。我最欣赏它里面的函数库部分了,真正的在线帮助。但是PHP发展的脚步实在太快了,你睢,我最近在www.php.net/manual/ 又找到了一些扩展的数组函数。
下面我把它们介绍给大家吧,我的英文水平不高,有译的不对的地方,请指正。
格式是这样的:
函数名 支持版本
函数声明
说明及参数、返回值
例子
OK,Let's go.
//*************************
array_flip (PHP4 >= 4.0b4)
array array_flip (array trans)
将数组trans的key、value交换,就是key变value,而value变key了。
返回完成处理的数组。
例:
$a[0]="abc";
$a[1]="def";
After an array_flip() you get:
$a["abc"]=0; $a["def"]=1;
//***************************
array_count_values (PHP4 >= 4.0b4)
array array_count_values (array input)
统计input数组中各个值的个数。返回一个数组,以input的值做为key,以出现个数为value的新数组。
例:
$array = array (1, "hello", 1, "world", "hello");
array_count_values ($array);
// returns array (1=>2, "hello"=>2, "world"=>1)
//*****************************
array_merge (PHP4 )
array array_merge (array array1, array array2 [, array ...])
合并多个数组,把array2的内容加在array1的后面。返回结果数组。
假如是关联数组,以字串为key,出现同名的key,则后面的会覆盖前面的,而下标数组不会出现覆盖的现象,只是添加在后面。
例:
$array1 = array ("color" => "red", 2, 4);
$array2 = array ("a", "b", "color" => "green", "shape" => "trapezoid", 4);
array_merge ($array1, $array2);
//Resulting array will be array("color" => "green", 2, 4, "a", "b", "shape" => "trapezoid", 4).
See also array_merge_recursive().
//******************************
array_merge_recursive (PHP4 >= 4.0.1)
array array_merge_recursive (array array1, array array2 [, array ...])
递归合并数组,与上个函数基本类似。区别在于,在关联数组方面,它不是简单地把相同的key合并,还是生成一个二维数组来合并这相同key的value。(表达不清,不好意思,看例子吧)。
例:
$ar1 = array ("color" => array ("favorite" => "red"), 5);
$ar2 = array (10, "color" => array ("favorite" => "green", "blue"));
$result = array_merge_recursive ($ar1, $ar2);
//Resulting array will be array ("color" => array ("favorite" => array ("red", "green"), "blue"), 5, 10).
明白了吗?red,green被合并成一个新的数组了,放在favorite里。
See also array_merge().
//*******************************
array_intersect (PHP4 >= 4.0.1)
array array_intersect (array array1, array array2 [, array ...])
取多个数组的交集,返回包含交集元素的新数组。
以array1为基础的,所以了,假如是关联数组,那key值就是array1的了。见例子。

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