数组，可以说是PHP的数据应用中较重要的一种方式。PHP的数组函数众多，下面是一些小结，借此记之，便于以后鉴之。

1. 数组定义 数组的定义使用 array()方式定义，可以定义空数组：<?php $number = array(1,3,5,7,9); //定义空数组 $result = array(); $color =array("red","blue","green"); //自定义键值 $language = (1=>"English",3=>"Chinese",5=>"Franch"); //定义二维数组 $two = array( "color"=>array("red","blue"), //用逗号结尾 "week"=>array("Monday","Friday") //最后一句没有标点 )； ?>

2. 创建数组 compact() compact()函数——将一个或多个变量（包含数组）转换为数组：array compact ( mixed $varname [, mixed $... ] )。 <?PHP $number = "1,3,5,7,9"; $string = "I'm PHPer"; $array = array("And","You?"); $newArray = compact("number","string","array"); PRint_r ($newArray); ?> compact()函数用于将两个或多个变量转换为数组，当然也包含数组变量。其参数是变量的名称而非带有$全名。相反的函数是extract()作用顾名思义就是将数组转换为单个的字符串，键值作为其字符串名称，数组值作为字符串的值。 运行结果:

Array ( [number] => 1,3,5,7,9 [string] => I'm PHPer [array] => Array ( [0] => And [1] => You? ) ) array_combine() array_combine()——将两个数组重组成一个数组,一个作键值一个做的值：array array_combine ( array $keys , array $values ) <?PHP $number = array("1","3","5","7","9"); $array = array("I","Am","A","PHP","er"); $newArray = array_combine($number,$array); print_r ($newArray); ?> array_combine函数不多说了，谁看了都明白。 运行结果： Array ( [1] => I [3] => Am [5] => A [7] => PHP [9] => er ) range() range()函数——创建指定范围的数组：<?PHP $array1 = range(0,100,10);//0为起始值，100为结束值，10为步进值(默认步进值为1). print_r($array1); echo"<br />"; $array2 = range("A","Z"); print_r($array2); echo "<br />"; $array3 = range("z","a"); print_r($array3); ?> array_fill() array_fill()函数——填充数组函数：<?PHP $array = range(1,10); $fillarray = range("a","d"); $arrayFilled = array_fill(0,5,$fillarray);//这里的$fillarray可以是字符串，如"test". echo "<pre>"; print_r ($arrayFilled); echo "</pre>"; $keys = array("string","2",9,"SDK","PK"); $array2 = array_fill_keys($keys,"testing"); echo "<pre>"; print_r ($array2); echo "</pre>"; ?> 运行结果：Array ( [0] => Array ( [0] => a [1] => b [2] => c [3] => d )

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

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

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

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

) Array ( [string] => testing [2] => testing [9] => testing [SDK] => testing [PK] => testing )

3. 数组的遍历 foreach遍历 foreach (array_expression as $value){} foreach (array_expression as $key => $value){}

<?PHP $speed = array(50,120,180,240,380); foreach($speed as $keys=>$values){ echo $keys."=>".$values."<br />"; } ?> 运行结果： 0=>50 1=>120 2=>180 3=>240 4=>380 while循环遍历 while循环遍历一般结合list函数，以下是实例 <?PHP $staff = array( array("姓名","性别","年龄"), array("小张","男",24), array("小王","女",25), array("小李","男",23) ); echo "<table border=2>"; while(list($keys,$value) = each($staff)){ list($name,$sex,$age) = $value; echo "<tr><td>$name</td><td>$sex</td><td>$age</td></tr>"; } echo "</table>"; ?> for循环遍历 <?PHP $speed = range(0,220,20); for($i =0;$i<count($speed);$i++) { echo $speed[$i]." "; } ?> 运行结果： 0 20 40 60 80 100 120 140 160 180 200 220 4. 数组的指针操作 涉及函数包括reset、prev、end、next、current、each。 实例一：next 与 prev <?PHP $speed = range(0,220,20); echo current($speed);//输出当前位置的值（在数组的开头位置） $i = rand(1,11); while($i--){ next($speed);//指针从当前位置向后移动一位 } echo current($speed);//输出当前位置的值 echo "<br />"; echo prev($speed);//输出前一位置数组值 echo "<br />"; echo reset($speed);//重置数组的指针，将指针指向起始位置 echo "<br />"; echo end($speed);//输出最后位置的数组值 echo "<br />"; ?> 运行结果： 0220 200 0 220 实例二：each函数指针操作 <?PHP $speed = range(0,200,40); echo "each实现指针下移 <br />"; echo "0挡的速度是".current(each($speed))."<br />"; echo "1挡的速度是".current(each($speed))."<br />"; echo "2挡的速度是".current(each($speed))."<br />"; echo "3挡的速度是".current(each($speed))."<br />"; echo "4挡的速度是".current(each($speed))."<br />"; echo "5挡的速度是".current(each($speed))."<br />"; echo "使用each函数实现数组指针的移动，进行数组遍历 <br />"; reset($speed);//这里是将数组指针指向数组首 while(list($key,$value)=each($speed)){ echo $key."=>".$value."<br />"; }?> 运行结果：each实现指针下移 0挡的速度是0 1挡的速度是40 2挡的速度是80 3挡的速度是120 4挡的速度是160 5挡的速度是200 使用each函数实现数组指针的移动，进行数组遍历 0=>0 1=>40 2=>80 3=>120 4=>160 5=>200 5. 数组的增添删改操作

增添数组成员 实例一：$num[] = value直接赋值追加到数组末尾： [code]<?PHP $num = array(1=>80,2=>120,3=>160); echo "使用表达式添加数组成员<br />"; $num[]=240; print_r($num); ?>

运行结果： 使用表达式添加数组成员 Array ( [0] => 80 [1] => 120 [2] => 160 [3] => 240 ) 实例二：array_pad函数，数组数组首尾选择性追加

<?PHP $num = array(1=>80,2=>120,3=>160); $num = array_pad($num,4,200); echo "使用array_pad函数向数组尾部添加成员<br />"; print_r($num); echo "<br />array_pad 还可以填充数组首部<br />"; $num = array_pad($num,-8,40); print_r($num); ?>

运行结果： 使用array_pad函数向数组尾部添加成员 Array ( [0] => 80 [1] => 120 [2] => 160 [3] => 200 ) array_pad 还可以填充数组首部 Array ( [0] => 40 [1] => 40 [2] => 40 [3] => 40 [4] => 80 [5] => 120 [6] => 160 [7] => 200 ) 实例三：入栈操作追加（array_push）： <?PHP $num = array(1=>80,2=>120,3=>160); array_push($num,200,240,280);//可以自己追加，直接加在数组结尾 print_r($num); ?>

运行结果： Array ( [1] => 80 [2] => 120 [3] => 160 [4] => 200 [5] => 240 [6] => 280 ) 实例四：array_unshift()在开头添加数组成员

<?PHP $num = array(1=>80,2=>120,3=>160); array_unshift($num,0,40);//可以自己追加，直接加在数组结尾 print_r($num); ?>

运行结果： Array ( [0] => 0 [1] => 40 [2] => 80 [3] => 120 [4] => 160 ) 注意：array_unshift()函数使用后数组的键值将会从0开始！ 删减数组成员 实例一：unset()命令删除数组成员或数组： 复制代码 代码如下:<?PHP $num = array_fill(0,5,rand(1,10)); print_r($num); echo "<br />"; unset($num[4]); print_r($num); echo "<br />"; unset($num); if(is_array){ echo "unset命令不能删除整个数组"; }else{ echo "unset命令可以删除数组"; } ?>

运行结果：（运行出错及说明数组也被删除，不再存在） Array ( [0] => 9 [1] => 9 [2] => 9 [3] => 9 [4] => 9 ) Array ( [0] => 9 [1] => 9 [2] => 9 [3] => 9 )

Notice: Use of undefined constant is_array - assumed 'is_array' in H:\wamp\www\testing\editorplus\test.php on line 21 unset命令不能删除整个数组 实例二：array_splice()函数删除数组成员 <?php $a=array("red", "green", "blue", "yellow"); count ($a); //得到4 array_splice($a,1,1); //删除第二个元素 count ($a); //得到3 echo $a[2]; //得到yellow echo $a[1]; //得到blue ?>

实例三：array_unique删除数组中的重复值：

<?php $a=array("red", "green", "blue", "yellow","blue","green"); $result = array_unique($a); print_r($result); ?> 运行结果： Array ( [0] => red [1] => green [2] => blue [3] => yellow ) 实例四：array_merge、array_merge_recursive合并数组 <?php $array1 = array("r"=>"red",1,2,3,4); $array2 = array("b"=>"blue",4=>5,6,7,8,9); $array3 = array("r"=>"read",4=>10,2=>11); $array4 = array( array(4=>10), array(7=>13) ); $array5 = array( array(4=>11), array(6=>12) ); $result = array_merge($array1,$array2,$array3,$array4,$array5); echo "<pre>"; print_r($result); echo "</pre>"; $result = array_merge_recursive($array1,$array2,$array3,$array4,$array5); echo "<pre>"; print_r ($result); echo "</pre>"; ?> Array ( [r] => read [0] => 1 [1] => 2 [2] => 3 [3] => 4 [b] => blue [4] => 5 [5] => 6 [6] => 7 [7] => 8 [8] => 9 [9] => 10 [10] => 11 [11] => Array ( [4] => 10 )

[12] => Array ( [7] => 13 )

[13] => Array ( [4] => 11 )

[14] => Array ( [6] => 12 )

) Array ( [r] => Array ( [0] => red [1] => read )

[0] => 1 [1] => 2 [2] => 3 [3] => 4 [b] => blue [4] => 5 [5] => 6 [6] => 7 [7] => 8 [8] => 9 [9] => 10 [10] => 11 [11] => Array ( [4] => 10 )

[12] => Array ( [7] => 13 )

[13] => Array ( [4] => 11 )

[14] => Array ( [6] => 12 )

) 注：1. array_merge的键名是数字的将重新建立索引；遇到相同的字符串键名时，后面的将覆盖前面的。