php笔记之：php数组相关函数的使用

<P style="WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 0px; FONT: 14px/21px 宋体,Verdana,Arial,Helvetica,sans-serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: #000000; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">创建数组就不再说了 array()函数

<P style="WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 0px; FONT: 14px/21px 宋体,sans-serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: #000000; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">提取数组可以用list().

<P style="WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 0px; FONT: 14px/21px 宋体,sans-serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: #000000; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">测试数组元素,可以用is_array()

<P style="WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 0px; FONT: 14px/21px 宋体,sans-serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: #000000; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">接受一个参数,传进来的变量,如果变量是数组,返回true如果不是返回false.

<P style="WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 0px; FONT: 14px/21px 宋体,sans-serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: #000000; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">添加和删除数组元素

<P style="WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 0px; FONT: 14px/21px 宋体,sans-serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: #000000; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">数组的fifo和lifo

<P style="WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 0px; FONT: 14px/21px 宋体,sans-serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: #000000; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">先解释下什么是fifo和lifo

<P style="WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 0px; FONT: 14px/21px 宋体,sans-serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: #000000; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">删除元素与加入元素的顺序相同,称为先进先出,既first-in-first-out

<P style="WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 0px; FONT: 14px/21px 宋体,sans-serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: #000000; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">删除元素与加入元素的顺序相反,称为后进先出,既last-in-first-out

<P style="WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 0px; FONT: 14px/21px 宋体,sans-serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: #000000; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">相对应的对数组的操作

<UL style="WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 2em; FONT: 14px/21px 宋体,sans-serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: #000000; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">

aray_unshift(array array,mixed variable [,mixed variable...])

normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: #000000; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">添加元素,所有已有的数值键都会相应的改变,以反映在数组中的新位置,关联键不受影响.

normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: #000000; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">例:

normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: #000000; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">PHP

normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: #000000; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">$words = array('a','b','c');

normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: #000000; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">print_r($words);

a,[1]->b,[2]->c);

normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: #000000; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">array_unshift($words,'d');

d,[1]->a,[2]->b,[3]->c);

normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: #000000; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">删除元素,删除并返回数组中找到的元素,结果是,如果使用的是数值键,则所有相应的值都会下移.如果使用的是关联键,数组不受影响.

normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: #000000; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">PHP
$words = array('a',sans-serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: #000000; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">array_shift($words,'a');

b,[1]->c);

• normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: #000000; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">添加元素,添加到数组的末尾,成功返回true 失败返回false.可以传递多个参数,作为输入,同时向数组压入多个变量.

  normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: #000000; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">例:

  normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: #000000; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">

  Berry"

  normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: #000000; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">

  本例将使$stack具有如下单元：

  Array ( [0] => orange [1] => banana [2] => apple [3] => raspBerry )

  normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: #000000; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">

  normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: #000000; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">PHP手册.对于数组操作,使用$array[]=,可以增加效率.因为不需要调用函数.

  normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: #000000; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">

  normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: #000000; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">从数组末尾删除元素并返回数组的最后一个元素.

  normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: #000000; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">

  经过此操作后，$stack将只有 3 个单元：

  Array ( [0] => orange [1] => banana [2] => apple )