对于网页编程来说，最重要的就是存取和读写数据了。存储方式可能有很多种，可以是字符串、数组、文件的形式等，今天学习了数组，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，下面是我学习的小结，借此记之，便于以后鉴之……
数组的定义使用 array（）方式定义，可以定义空数组：
.foreach遍历：
<p class="sycode"> <? 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 )； ?> </p>
创建数组包含的函数有compact()、
1.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 $... ] )
<p class="sycode"> <? PHP $number = " 1,3,5,7,9 " ; $string = " I'm PHPer " ; $array = array ( " And " , " You? " ); $newArray = compact ( " number " , " string " , " array " ); print_r ( $newArray ); ?> </p>
compact()函数用于将两个或多个变量转换为数组，当然也包含数组变量。其参数是变量的名称而非带有$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:
<p class="sycode"> Array ( [ number ] = > 1 , 3 , 5 , 7 , 9 [ string ] = > I'm PHPer [ array ] = > Array ( [ 0 ] = > And [ 1 ] = > You? ) ) </p>
array array_combine ( array $keys , array $values )
<p class="sycode"> <? PHP $number = array ( " 1 " , " 3 " , " 5 " , " 7 " , " 9 " ); $array = array ( " I " , " Am " , " A " , " PHP " , " er " ); $newArray = array_combine ( $number , $array ); print_r ( $newArray ); ?> </p>
array_combine函数不多说了，谁看了都明白
运行结果：
<p class="sycode"> Array ( [ 1 ] = > I [ 3 ] = > Am [ 5 ] = > A [ 7 ] = > PHP [ 9 ] = > er ) </p>
不多说了，直接上实例??
<p class="sycode"> <? 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 ); ?> </p>
range()函数的默认步进值是1！
运行结果：
<p class="sycode"> Array ( [ 0 ] => 0 [ 1 ] => 10 [ 2 ] => 20 [ 3 ] => 30 [ 4 ] => 40 [ 5 ] => 50 [ 6 ] => 60 [ 7 ] => 70 [ 8 ] => 80 [ 9 ] => 90 [ 10 ] => 100 ) Array ( [ 0 ] => A [ 1 ] => B [ 2 ] => C [ 3 ] => D [ 4 ] => E [ 5 ] => F [ 6 ] => G [ 7 ] => H [ 8 ] => I [ 9 ] => J [ 10 ] => K [ 11 ] => L [ 12 ] => M [ 13 ] => N [ 14 ] => O [ 15 ] => P [ 16 ] => Q [ 17 ] => R [ 18 ] => S [ 19 ] => T [ 20 ] => U [ 21 ] => V [ 22 ] => W [ 23 ] => X [ 24 ] => Y [ 25 ] => Z ) Array ( [ 0 ] => z [ 1 ] => y [ 2 ] => x [ 3 ] => w [ 4 ] => v [ 5 ] => u [ 6 ] => t [ 7 ] => s [ 8 ] => r [ 9 ] => q [ 10 ] => p [ 11 ] => o [ 12 ] => n [ 13 ] => m [ 14 ] => l [ 15 ] => k [ 16 ] => j [ 17 ] => i [ 18 ] => h [ 19 ] => g [ 20 ] => f [ 21 ] => e [ 22 ] => d [ 23 ] => c [ 24 ] => b [ 25 ] => a ) </p>
<p class="sycode"> <? 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 class="brush:php;toolbar:false"> " ; print_r ( $arrayFilled ); echo "
" ; print_r ( $array2 ); echo "
运行结果：
<p class="sycode"> 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) </p>
foreach (array_expression as $value){}
foreach (array_expression as $key => $value){}
闲话少说，上实例：
<p class="sycode"> <? PHP $speed = array ( 50 , 120 , 180 , 240 , 380 ); foreach ( $speed as $keys => $values ){ echo $keys . " => " . $values . " <br /> " ; } ?> </p>
<p class="sycode"> 0 => 50 1 => 120 2 => 180 3 => 240 4 => 380 </p>
while循环遍历一般结合list函数，以下是实例
<p class="sycode"> <? 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> " ; ?> </p>| 姓名 | 性别 | 年龄 |
| 小张 | 男 | 24 |
| 小王 | 女 | 25 |
| 小李 | 男 | 23 |
<p class="sycode"> <? PHP $speed = range ( 0 , 220 , 20 ); for ( $i = 0 ; $i < count ( $speed ); $i ++ ) { echo $speed [ $i ] . " " ; } ?> </p>
<p class="sycode"> 0 20 40 60 80 100 120 140 160 180 200 220 </p>
涉及函数包括reset、prev、end、next、current、each
实例一：
<p class="sycode"> <? 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 /> " ; ?> </p>运行结果：
<p class="sycode"> 0220 200 0 220 </p>
<p class="sycode"> <? 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 /> " ; } ?> </p>运行结果：
<p class="sycode"> each实现指针下移 0挡的速度是01挡的速度是402挡的速度是803挡的速度是1204挡的速度是1605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 </p>
<p class="sycode"> <? 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 ); ?> </p>
<p class="sycode"> 使用表达式添加数组成员 Array ( [ 0 ] => 80 [ 1 ] => 120 [ 2 ] => 160 [ 3 ] => 240 ) </p>
<p class="sycode"> <? 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 ); ?> </p>
运行结果：
<p class="sycode"> 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 ) </p>
<p class="sycode"> <? 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 ); ?> </p>
运行结果：
<p class="sycode"> Array ( [ 1 ] => 80 [ 2 ] => 120 [ 3 ] => 160 [ 4 ] => 200 [ 5 ] => 240 [ 6 ] => 280 ) </p>
<p class="sycode"> <? 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 ); ?> </p>
运行结果：
<p class="sycode"> Array ( [ 0 ] => 0 [ 1 ] => 40 [ 2 ] => 80 [ 3 ] => 120 [ 4 ] => 160 ) </p>
注意：array_unshift()函数使用后数组的键值将会从0开始！
2.删减数组成员： 实例一：unset()命令删除数组成员或数组：
<p class="sycode"> <? 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 " ; } ?> </p>
<p class="sycode"> 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 </p>
<p class="sycode"> <? 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 ?> </p>
<p class="sycode"> <? php $a = array ( " red " , " green " , " blue " , " yellow " , " blue " , " green " ); $result = array_unique ( $a ); print_r ( $result ); ?> </p>
运行结果：
<p class="sycode"> Array ( [ 0 ] => red [ 1 ] => green [ 2 ] => blue [ 3 ] => yellow ) </p>
<p class="sycode"> <? 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 class="brush:php;toolbar:false"> " ; print_r ( $result ); echo "
" ; print_r ( $result ); echo "
<p class="sycode"> 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 )) </p>
2.array_merge_recursive函数的作用是将相同字符串的键名单元整合成一个数组。
<p class="sycode"> <? php $array = range ( 0 , 9 ); if ( in_array ( 9 , $array )){ echo " 数组中存在 " ; } ?> </p>运行结果：
| 数组中存在 |
<p class="sycode"> <? php $array = range ( 0 , 9 ); $num = rand ( 0 , 8 ); while ( $num -- ) next ( $array ); $key = key ( $array ); echo $key ; ?> </p>
此实例结果为动态结果，范围（0-8），不做结果演示。
实例三：list()函数把数组中的值赋给指定变量：
<p class="sycode"> <? 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> " ; ?> </p>
<p class="sycode"> <? PHP $array = array ( " red " , " blue " , " yellow " , " Black " ); print_r ( $array ); echo " <br /> " ; $array = array_flip ( $array ); print_r ( $array ); ?> </p>
运行结果：
<p class="sycode"> Array ( [ 0 ] => red [ 1 ] => blue [ 2 ] => yellow [ 3 ] => Black ) Array ( [red] => 0 [blue] => 1 [yellow] => 2 [Black] => 3 ) </p>
<p class="sycode"> <? PHP $array = array ( " red " , " blue " , " yellow " , " Black " ); $result = array_keys ( $array ); print_r ( $result ); echo " <br /> " ; $result = array_values ( $array ); print_r ( $result ); ?> </p>
运行结果：
<p class="sycode"> Array ( [ 0 ] => 0 [ 1 ] => 1 [ 2 ] => 2 [ 3 ] => 3 ) Array ( [ 0 ] => red [ 1 ] => blue [ 2 ] => yellow [ 3 ] => Black ) </p>
实例六：array_search()搜索数值:
<p class="sycode"> <? PHP $array = array ( " red " , " blue " , " yellow " , " Black " ); $result = array_search ( " red " , $array ); if (( $result === NULL )){ echo " 不存在数值red " ; } else { echo " 存在数值 $result " ; } ?> </p>结果：存在数值 0
函数array_search()返回的值可能为false或0或NULL，所以在判断时注意要用"==="
七、数组的排序： 实例一：sort()、rsort()/asort()、arsort()对数组排序：
<p class="sycode"> <? PHP $array = array ( " b " , " c " , " d " , " a " ); sort ( $array ); // 从低到高排序 print_r ( $array ); echo " <br /> " ; rsort ( $array ); // 逆向排序 print_r ( $array ); ?> </p>
结果：
<p class="sycode"> Array ( [ 0 ] => a [ 1 ] => b [ 2 ] => c [ 3 ] => d ) Array ( [ 0 ] => d [ 1 ] => c [ 2 ] => b [ 3 ] => a ) </p>
sort()、rsort()函数对数组进行从低到高的排序，返回结果为bool值；
asort()、arsort()函数是保留键值的排序，排序后键值不重新索引。
实例二：将数组顺序打乱??shuffle()函数：
<p class="sycode"> <? PHP $array = array ( " a " , " b " , " c " , " d " ); shuffle ( $array ); // 从低到高排序 print_r ( $array ); ?> </p>
结果为动态结果：
<p class="sycode"> Array ( [ 0 ] => c [ 1 ] => a [ 2 ] => d [ 3 ] => b ) </p>
shuffle的结果有点随机的意味，每次刷新都不一样。
<p class="sycode"> <? PHP $array = array ( " d " , " b " , " a " , " c " ); $array = array_reverse ( $array ); // 从低到高排序 print_r ( $array ); ?> </p>
运行结果：
<p class="sycode"> Array ( [ 0 ] => c [ 1 ] => a [ 2 ] => b [ 3 ] => d ) </p>
<p class="sycode"> <? PHP $array = array ( " sort2 " , " Sort5 " , " sort1 " , " sort4 " ); natsort ( $array ); // 从低到高排序 print_r ( $array ); echo " <br /> " ; natcasesort ( $array ); print_r ( $array ); ?> </p>
结果：
<p class="sycode"> Array ( [ 1 ] => Sort5 [ 2 ] => sort1 [ 0 ] => sort2 [ 3 ] => sort4 ) Array ( [ 2 ] => sort1 [ 0 ] => sort2 [ 3 ] => sort4 [ 1 ] => Sort5 ) </p>
natsort()、natcasesort()对数组进行自然排序，就是使用数字的正常排序算法。natcasesort会忽略大小写。
实例五：对数组进行键值排序ksort():
<p class="sycode"> <? PHP $array = array ( 1 => " sort2 " , 4 => " Sort5 " , 2 => " sort1 " , 3 => " sort4 " ); ksort ( $array ); // 从低到高排序 print_r ( $array ); ?> </p>
结果：
<p class="sycode"> Array ( [ 1 ] => sort2 [ 2 ] => sort1 [ 3 ] => sort4 [ 4 ] => Sort5 ) </p>
注意：ksort()函数重新建立了索引。
八、数组的其他用法：cout($array) --------统计数组的单元个数
array_diff($array1,$array2)----------统计数组之间的不同点，返回第一个数组中有而第二个数组中没有的。
array_diff_assoc($array1,$array2)---------同array_diff()，只是它对键值也比较
array_diff_key($array1,$array2)------------比较键值
array_product($array)-----------返回数组的所有数的乘积
array_sum($array)--------------所有数值的和
array_rand($array,$n)----------在$array数组中取出$n个数值，返回数组
array_intersect($array1,$array2)----------------取得两个数组的交集
array_intersect_assoc($array1,$array2)---------------在array_intersect 的基础上进行键值比较
array_intersect_key($array1,$array2)-----------------比较两个数组键值的交集
数组的使用在PHP中至关重要，由于PHP没有指针，所以数组承担了很大的数据操作任务。学好数组，才能把PHP应用的得心应手，这里所列均是常用的PHP数组相关的函数及用法，欢迎一起学习！
Welche Software zum Online-Testen der Computerleistung gibt es?
Welche Methoden gibt es, um die IP in dynamischen VPS sofort zu ändern?
Konvertierung von RGB in Hexadezimal
Was ist die Tastenkombination zum Wechseln des Benutzers?
Was ist die Tastenkombination zum Kopieren und Einfügen bei Strg?
Fehlermanagement-Tool
Was ist Kryptowährung Kol
So zentrieren Sie die Webseite in Dreamweaver
