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数组的常用函数- 001 <?php
- 002 /* 数组的常用函数
- 003 *
- 004 * 数组的排序函数
- 005 * sort()
- 006 * rsort()
- 007 * usort()
- 008 * asort()
- 009 * arsort()
- 010 * uasort()
- 011 * ksort()
- 012 * krsort()
- 013 * uksort()
- 014 * uatsort()
- 015 * natcasesort()
- 016 * array_multisort()
- 017 *
- 018 * 1.简单的数组排序
- 019 * sort() rsort()
- 020 * 2.根据键名对数组排序
- 021 * ksort() krsort()
- 022 * 3.根据元素的值对数组排序
- 023 * asort() arsort()
- 024 * 4.根据"自然数排序“法对数组排序
- 025 * natsort()//区分大小写字母比较 natcasescort()//不区分大小写字母的比较
- 026 * 5.根据用户自定义规则对数组排序
- 027 * usort() uasort() uksort()对键排序
- 028 * 6.对维数组的排序
- 029 * array_multisort()
- 030 *
- 031 * 拆分、合并、分解、接合的数组函数
- 032 * 1.array_slice()
- 033 * 2.array_splice()//删除
- 034 * 3.array_combine()//合并
- 035 * 4.array_merge();//合并
- 036 * 5.array_intersect();//多个数组的交集
- 037 * 6.array_diff();//返回多个数组的差集
- 038 *
- 039 * 数组与数据结构的函数
- 040 * 1.使用数组实现堆栈 //先进后出
- 041 * array_push() array_pop()
- 042 * 2.使用数组实现队列 //先进先出
- 043 * array_unshift() array_shift() unset()
- 044 *
- 045 *
- 046 * 其他与数组操作有关的函数
- 047 * array_rand()
- 048 * shuffle()
- 049 * array_sum()
- 050 * range()
- 051 */
- 052
- 053 //简单数组排序的使用
- 054 $data=array(5,8,1,7,2);
- 055 sort($data);//元素由小到大进行排序
- 056 print_r($data);//Array ( [0] => 1 [1] => 2 [2] => 5 [3] => 7 [4] => 8 )
- 057 rsort($data);//元素由大到小进行排序
- 058 print_r($data);//Array ( [0] => 8 [1] => 7 [2] => 5 [3] => 2 [4] => 1 )
- 059
- 060 //根据键名排序的例子
- 061 $data_2=array(5=>"five",8=>"eight",1=>"one",7=>"seven",2=>"two");
- 062 ksort($data_2);//对数组的下标进行由小到大排序
- 063 print_r($data_2);//Array ( [1] => one [2] => two [5] => five [7] => seven [8] => eight )
- 064 krsort($data_2);//对数组的下标进行由大到小排序
- 065 print_r($data_2);//Array ( [8] => eight [7] => seven [5] => five [2] => two [1] => one )
- 066
- 067
- 068
- 069 //根据元素的值对数组排序
- 070 $data_3=array("1"=>"Linux","a"=>"Apache","m"=>"MySQL","l"=>"PHP");
- 071 //asort() arsort 与 sort() rsort()的区别在于 前者排序后保持原有的键名,后者不保持原有键名，且键名从0开始
- 072 asort($data_3);
- 073 print_r($data_3);//Array ( [a] => Apache [1] => Linux [m] => MySQL [l] => PHP )
- 074 echo '<br/>';
- 075 arsort($data_3);
- 076 print_r($data_3);//Array ( [l] => PHP [m] => MySQL [1] => Linux [a] => Apache )
- 077 echo '<br/>';
- 078 sort($data_3);
- 079 print_r($data_3);//Array ( [0] => Apache [1] => Linux [2] => MySQL [3] => PHP )
- 080 echo '<br/>';
- 081 rsort($data_3);
- 082 print_r($data_3);//Array ( [0] => PHP [1] => MySQL [2] => Linux [3] => Apache )
- 083
- 084 //根据”自然数排序法“对数组排序(0-9短者优先)
- 085 $data_4=array("file.txt","file11.txt","file2.txt","file22.txt");
- 086 sort($data_4);
- 087 print_r($data_4);//Array ( [0] => file.txt [1] => file11.txt [2] => file2.txt [3] => file22.txt )
- 088 echo '<br>';
- 089 natsort($data_4);
- 090 print_r($data_4);//Array ( [0] => file.txt [2] => file2.txt [1] => file11.txt [3] => file22.txt )
- 091 echo '<br>';
- 092 natcasesort($data_4);
- 093 print_r($data_4);//Array ( [0] => file.txt [2] => file2.txt [1] => file11.txt [3] => file22.txt )
- 094 echo '<br>';
- 095
- 096 //用户自定义排序函数
- 097 echo '<br/>';
- 098 $data_5=array("Linux","Apache","MySQL","PHP");
- 099 usort($data_5,"sortbylen");//通过元素长度排序
- 100 print_r($data_5);//Array ( [0] => PHP [1] => MySQL [2] => Linux [3] => Apache )
- 101 function sortbylen($one,$two){
- 102 if(strlen($one)==strlen($two))
- 103 return 0;
- 104 else
- 105 return (strlen($one)>strlen($two))?1:-1;
- 106 }
- 107
- 108 //拆分、合并、分解、接合的数组函数
- 109 echo '<br/>';
- 110 $data_6=array("Linux","Apache","MySQL","PHP");
- 111 print_r(array_slice($data_6,1,2));//取下标为1、2的元素
- 112 //Array ( [0] => Apache [1] => MySQL ) 下标重置从0开始
- 113 echo '<br/>';
- 114
- 115 print_r(array_slice($data_6,-2,1));//从后边的第二个开始取返回一个，不是从0开始的
- 116 //Array ( [0] => MySQL ) 下标重置从0开始
- 117 echo '<br/>';
- 118
- 119 print_r(array_slice($data_6,1,2,true));
- 120 //Array ( [1] => Apache [2] => MySQL ) 保留原有的下标
- 121
- 122 echo '<br/>';
- 123
- 124
- 125 //array_combine()
- 126 $a1=array("OS","WebServer","DataBase","Language");
- 127 $a2=array("Linux","Apache","MySQL","PHP");
- 128
- 129 print_r(array_combine($a1,$a2));//第一个参数作为键名，第二个作为值来合并
- 130 //Array ( [OS] => Linux [WebServer] => Apache [DataBase] => MySQL [Language] => PHP )
- 131
- 132 echo '<br/>';
- 133
- 134 //array_merge()
- 135 $a3=array("OS","WebServer","DataBase","Language");
- 136 $a4=array("Linux","Apache","MySQL","PHP");
- 137 $a5=$a3+$a4;
- 138 print_r($a5);//因为两个数组下标重复所以显示这样
- 139 //Array ( [0] => OS [1] => WebServer [2] => DataBase [3] => Language )
- 140 echo '<br/>';
- 141 print_r(array_merge($a3,$a4));//合并并重新索引
- 142 //Array ( [0] => OS [1] => WebServer [2] => DataBase [3] => Language [4] => Linux [5] => Apache [6] => MySQL [7] => PHP )
- 143
- 144 echo '<br/>';
- 145
- 146 //array_intersect()
- 147 $a7=array("OS","WebServer","DataBase","Language",1,2,3);
- 148 $a8=array("Linux","Apache","MySQL","PHP",2,3,4);
- 149 print_r(array_intersect($a7,$a8));//Array ( [5] => 2 [6] => 3 )
- 150 echo '<br/>';
- 151
- 152 //array_diff()
- 153 $a9=array(1,2,3,4);
- 154 $a10=array(3,4,5,6);
- 155 print_r(array_diff($a9,$a10));//Array ( [0] => 1 [1] => 2 )
- 156 //返回第一个数组跟第二个相差的元素
- 157 echo '<br/>';
- 158
- 159
- 160 //使用数组实现堆栈
- 161 $b=array(1,2,3,4);
- 162 $b[]="a";//入栈
- 163 array_push($b,"b","c");//使用函数入栈
- 164 print_r($b);//Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => a [5] => b [6] => c )
- 165 echo '<br/>';
- 166
- 167 $value=array_pop($b);//使用函数出栈
- 168 print_r($b);//Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => a [5] => b )
- 169 echo '<br/>';
- 170 echo $value;//显示出栈的元素的值 c
- 171 echo '<br/>';
- 172
- 173 //使用数组实现队列
- 174 $c=array(1,2,3);
- 175 print_r($c);//Array ( [0] => 1 [1] => 2 [2] => 3 )
- 176 echo '<br/>';
- 177 array_unshift($c,"abc","bcd");//入队
- 178 print_r($c);//Array ( [0] => abc [1] => bcd [2] => 1 [3] => 2 [4] => 3 )
- 179 echo '<br/>';
- 180 $values=array_shift($c);//出队
- 181 print_r($c);// Array ( [0] => bcd [1] => 1 [2] => 2 [3] => 3 )
- 182 echo '<br/>';
- 183 unset($c[2]);//删除指定位置元素
- 184 print_r($c);//Array ( [0] => bcd [1] => 1 [3] => 3 )
- 185 echo '<br/>';
- 186
- 187
- 188 //array_rand() 随机返回数组下标
- 189 $arr=array(1,3,4,5,76,7,99,6,2,3);
- 190 echo array_rand($arr);//返回的是随机的数组元素的下标
- 191 echo $arr[array_rand($arr)];//随机显示数组元素的值
- 192 echo '<br/>';
- 193 //shuffle() 随机重新排列数组
- 194 $arr2=array(32,35,33);
- 195 shuffle($arr2);
- 196 print_r($arr2);//数组元素位置随机变换
- 197 echo '<br/>';
- 198 //array_sum() 求和
- 199 $arr3=array(1,3,5);
- 200 echo array_sum($arr3); //返回9
- 201 echo '<br/>';
- 202 print_r($arr3);//Array ( [0] => 1 [1] => 3 [2] => 5 )
- 203 echo '<br/>';
- 204 //range(最小值，最大值，步长)
- 205 $arr4=range(0,100,10);
- 206 print_r($arr4);//Array ( [0] => 0 [1] => 10 [2] => 20 [3] => 30 [4] => 40 [5] => 50 [6] => 60 [7] => 70 [8] => 80 [9] => 90 [10] => 100 )
- 207
- 208 ?>
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发表于 2011-06-11 15:08