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php 常用数组应用说明(1/2)

Jun 13, 2016 am 10:03 AM
php range step for value create Commonly used application array of illustrate order

ange($low, $high),range($low, $high, $step);//创建顺序值的数组如:range(1,4)为(1,2,3,4)又如range('a','z')

each($array)按顺序返回数组的当前元素,并且将下一个元素设置为当前元素;

reset($array)将数组当前元素重新设置到数组开始处

list()可以用来将一个数组分解为一系列的值,如 list($a,$b)=each($array)

shuffle($array),array_rand($arg, $num_req);对数组随机排序

array_reverse($input),array_reverse($input, $preserve_keys)   返回原数组的反向排序

sort($array);对数组排序

 

php教程数组是一个重要的概念,它包含有大量的函数,方便人们的开发…现将它的数组分类,以方便查询及应用.
先说说php数组的定义…php数组包含两个项,key和value,可以通过key来获取相应的value,其中key又可以是数值和关联的,如$array[0],$array[one]…
创建数组
php中的数组声明跟其它语言的也有点小小的差别,但一样可以声明为一维,两维,三维及多维等,如
$array[0] = 1,$array = array(1,2,3); 一维数组,只包括三个值,属于数值型数组,引用时可用$array[0]来代表1,创建数值数组时可以省略索引.

$array = array(
   1 => “one”,
   2 => “two”,
   3 => “three”,
   4 => array(
    “one” => 1,
    “two” => 2,
    “three” => 3
   )
);

二维数组,同时又是关联数组,引用时可以$array[4][“one”]来代表1.
三维以上依此类推…
如果要批量创建数组,则可以通过下面这个函数:
array range ( mixed low, mixed high [, number step] )
如$array = range(1,6);代表array(1,2,3,4,5,6);
   $array = range(a,f); 代表 array(a,b,c,d,e,f);

输出数组
php中输出数组的函数有比较多,常用的有
bool print_r ( mixed expression [, bool return] )
void var_dump ( mixed expression [, mixed expression [, ...]] )
还有像echo,print,printf都可以输出单个数组.

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