时间：2021-07-01 10:21:17 帮助过：5人阅读
数组的定义使用 array（）方式定义，可以定义空数组：
.foreach遍历：
" 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 )； ?>
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 $... ] )
compact()函数用于将两个或多个变量转换为数组，当然也包含数组变量。其参数是变量的名称而非带有$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 array_combine ( array $keys , array $values )
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 )
不多说了，直接上实例??
" ; $array2 = range ( " A " , " Z " ); print_r ( $array2 ); echo "
" ; $array3 = range ( " z " , " a " ); print_r ( $array3 ); ?>
range()函数的默认步进值是1！
运行结果：
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 )
" ; $keys = array ( " string " , " 2 " , 9 , " SDK " , " PK " ); $array2 = array_fill_keys( $keys , " testing " ); echo "" ; print_r ( $arrayFilled ); echo "
" ; print_r ( $array2 ); echo "" ; ?>
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)
foreach (array_expression as $value){}
foreach (array_expression as $key => $value){}
闲话少说，上实例：
运行结果：$values ){ echo $keys . " => " . $values . "
" ; } ?>
2.while循环遍历：0 => 50 1 => 120 2 => 180 3 => 240 4 => 380
while循环遍历一般结合list函数，以下是实例
运行结果：" ; while ( list ( $keys , $value ) = each ( $staff )){ list ( $name , $sex , $age ) = $value ; echo "
" ; } echo " " ; ?> $name $sex $age
| 姓名 | 性别 | 年龄 |
| 小张 | 男 | 24 |
| 小王 | 女 | 25 |
| 小李 | 男 | 23 |
运行结果：
0 20 40 60 80 100 120 140 160 180 200 220
涉及函数包括reset、prev、end、next、current、each
实例一：
输出当前位置的值 echo "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 ); //
运行结果：
实例二：each函数指针操作0220 200 0 220
" ; echo " 0挡的速度是 " . current ( each ( $speed )) . "
" ; echo " 1挡的速度是 " . current ( each ( $speed )) . "
" ; echo " 2挡的速度是 " . current ( each ( $speed )) . "
" ; echo " 3挡的速度是 " . current ( each ( $speed )) . "
" ; echo " 4挡的速度是 " . current ( each ( $speed )) . "
" ; echo " 5挡的速度是 " . current ( each ( $speed )) . "
" ; echo " 使用each函数实现数组指针的移动，进行数组遍历
" ; reset ( $speed ); // 这里是将数组指针指向数组首 while ( list ( $key , $value ) = each ( $speed )){ echo $key . " => " . $value . "
" ; } ?>
运行结果：
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
运行结果：80 , 2 => 120 , 3 => 160 ); echo " 使用表达式添加数组成员
" ; $num [] = 240 ; print_r ( $num ); ?>
使用表达式添加数组成员 Array ( [ 0 ] => 80 [ 1 ] => 120 [ 2 ] => 160 [ 3 ] => 240 )
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
" ; print_r ( $num ); echo "
array_pad 还可以填充数组首部
" ; $num = array_pad ( $num ,- 8 , 40 ); print_r ( $num ); ?>
运行结果：
实例三：入栈操作追加（array_push）：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 )
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 )
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！
2.删减数组成员： 实例一：unset()命令删除数组成员或数组：
运行结果：（运行出错及说明数组也被删除，不再存在）" ; unset ( $num [ 4 ]); print_r ( $num ); echo "
" ; 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 " ; } ?>
实例二：array_splice()函数删除数组成员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
实例三：array_unique删除数组中的重复值：
运行结果：
实例四：array_merge、array_merge_recursive合并数组Array ( [ 0 ] => red [ 1 ] => green [ 2 ] => blue [ 3 ] => yellow )
运行结果：" 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 "
" ; print_r ( $result ); echo "" ; $result = array_merge_recursive ( $array1 , $array2 , $array3 , $array4 , $array5 ); echo "" ; print_r ( $result ); echo "" ; ?>
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。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 ))
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。
运行结果：
| 数组中存在 |
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：
运行结果： 实例四：array_flip()交换数组的键值和值:" ; while ( list ( $keys , $value ) = each ( $staff )){ list ( $name , $sex , $age ) = $value ; echo "
" ; } echo " " ; ?> $name $sex $age
" ; $array = array_flip ( $array ); print_r ( $array ); ?>
运行结果：
实例五：array_keys()、array_values()返回数组中所有的键值和值：Array ( [ 0 ] => red [ 1 ] => blue [ 2 ] => yellow [ 3 ] => Black ) Array ( [red] => 0 [blue] => 1 [yellow] => 2 [Black] => 3 )
" ; $result = array_values ( $array ); print_r ( $result ); ?>
运行结果：
Array ( [ 0 ] => 0 [ 1 ] => 1 [ 2 ] => 2 [ 3 ] => 3 ) Array ( [ 0 ] => red [ 1 ] => blue [ 2 ] => yellow [ 3 ] => Black )
实例六：array_search()搜索数值:
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：
" ; rsort ( $array ); // 逆向排序 print_r ( $array ); ?>
结果：
Array ( [ 0 ] => a [ 1 ] => b [ 2 ] => c [ 3 ] => d ) Array ( [ 0 ] => d [ 1 ] => c [ 2 ] => b [ 3 ] => a )
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：
结果为动态结果：
Array ( [ 0 ] => c [ 1 ] => a [ 2 ] => d [ 3 ] => b )
shuffle的结果有点随机的意味，每次刷新都不一样。
运行结果：
实例四：自然排序算法??natsort()和natcasesort();Array ( [ 0 ] => c [ 1 ] => a [ 2 ] => b [ 3 ] => d )
" ; natcasesort ( $array ); print_r ( $array ); ?>
结果：
Array ( [ 1 ] => Sort5 [ 2 ] => sort1 [ 0 ] => sort2 [ 3 ] => sort4 ) Array ( [ 2 ] => sort1 [ 0 ] => sort2 [ 3 ] => sort4 [ 1 ] => Sort5 )
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():
" sort2 " , 4 => " Sort5 " , 2 => " sort1 " , 3 => " sort4 " ); ksort ( $array ); // 从低到高排序 print_r ( $array ); ?>
结果：
Array ( [ 1 ] => sort2 [ 2 ] => sort1 [ 3 ] => sort4 [ 4 ] => Sort5 )
注意：ksort()函数重新建立了索引。
八、数组的其他用法：cout($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！