5_PHP数组_3_数组处理函数及其应用_1_快速创建数组的函数

以下为学习孔祥盛主编的《PHP编程基础与实例教程》（第二版）所做的笔记。

一、快速创建数组的函数

1. range() 函数

程序：

<?php
$numbers = range(1,5);
print_r($numbers);
echo "<br/>";
$chars1 = range('a','d');
print_r($chars1);
echo "<br/>";
$chars2 = range('d','a');
print_r($chars2);
echo "<br/>";
?>

输出：

Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 ) 
Array ( [0] => a [1] => b [2] => c [3] => d ) 
Array ( [0] => d [1] => c [2] => b [3] => a ) 

2. explode() 函数

程序:

<?php
$ip = "127.0.0.1";
$exploded = explode(".",$ip);
print_r($exploded);
echo "<br/>";
?>

输出：

Array ( [0] => 127 [1] => 0 [2] => 0 [3] => 1 ) 

3. array_combine() 函数

程序：

<?php
$fruits = array( "apple", "banana", "orange" );
$colors = array( "red", "yellow", "orange" );
$temp = array_combine($fruits, $colors);    //$firuts的值做 $temp的键, $olors的值做 $temp的值
print_r($temp);
?>

输出：

Array ( [apple] => red [banana] => yellow [orange] => orange )

4. array_fill()函数

程序：

<?php
$banana = array_fill(5, 3, 'banana');
print_r($banana);
echo "<br/>";
$orange = array_fill(5,-1, 'orange');   //length<0会提示 Warning警告信息
print_r($orange);
echo "<br/>";
?>

输出：

5. array_pad() 函数

程序：

<?php
$info = array('coffee','brown','caffeine');
$tea1 = array_pad($info, 5, 'tea');
$tea2 = array_pad($info, -7, 'tea');
$tea3 = array_pad($info, 2, 'tea');
print_r($tea1);
echo "<br/>";
print_r($tea2);
echo "<br/>";
print_r($tea3);
?>

输出：

Array ( [0] => coffee [1] => brown [2] => caffeine [3] => tea [4] => tea ) 
Array ( [0] => tea [1] => tea [2] => tea [3] => tea [4] => coffee [5] => brown [6] => caffeine ) 
Array ( [0] => coffee [1] => brown [2] => caffeine )