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Thinkphp数组array常用函数

智云科技 发布于 2022年5月14日 评论关闭 阅读(638)

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这篇文章主要介绍了php常用数组array函数,结合实例形式总结分析了php常用的数组操作函数,包括数组的赋值、拆分、合并、计算、添加、删除、查询、判断、排序等,需要的朋友可以参考下

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array_combine

功能：用一个数组的值作为新数组的键名，另一个数组的值作为新数组的值 

 <?php  
$a  =   array ( "one" , "two" , "three" ); 
$b  =   array ( "一" , "二" , "三" ); 
$c  =  array_combine($a,$b); 
print_r($c); 
 /**结果  
 *Array ( [one] => 一 [two] => 二 [three] => 三 )  
 */

array_chunk

功能：拆分数组成多个数组 

  <?php  
$input_array  =   array ( "a"  =>  "apple" , "b"  =>  "blue" , "c" , "d" , "e" ); 
 echo   "<pre>" ; 
print_r(array_chunk($input_array,  2 )); 
print_r(array_chunk($input_array,  2 ,True)); 
 echo   "</pre>" ; 
 /**结果  
 Array  
 (  
  [0] => Array  
  (  
  [0] => apple  
  [1] => blue  
  )  
  [1] => Array  
  (  
  [0] => c  
  [1] => d  
  )  
  [2] => Array  
  (  
  [0] => e  
  )  
 )  
 Array  
 (  
  [0] => Array  
  (  
  [a] => apple  
  [b] => blue  
  )  
  [1] => Array  
  (  
  [0] => c  
  [1] => d  
  )  
  [2] => Array  
  (  
  [2] => e  
  )  
 )  
 */

array_count_values

功能：统计数组中值出现的次数 

  <?php  
$input_array  =   array ( "a"  =>  "apple" , "b"  =>  "blue" , "c" , "d" , "e" ); 
 echo   "<pre>" ; 
print_r(array_count_values($input_array)); 
 echo   "</pre>" ; 
 /**结果  
 Array  
 (  
  [apple] => 1  
  [blue] => 1  
  [c] => 1  
  [d] => 1  
  [e] => 1  
 )  
 */

array_diff

功能：第一个数组中去掉第二个数组中有的数据，返回剩下的内容作为结果 

  <?php  
$array1  =   array ( "a"  =>  "apple" , "b"  =>  "blue" , "c" , "d" , "e" ); 
$array2  =   array ( "apple" , "c" , "d" , "f" ); 
$result  =  array_diff($array1, $array2); 
$result2  =  array_diff($array2, $array1); 
 echo   "<pre>" ; 
print_r($result); //数组1中去掉数组2中剩下的  
print_r($result2); //数组2中去掉数组1中剩下的  
 echo   "</pre>" ; 
 /**结果  
 Array  
 (  
  [b] => blue  
  [2] => e  
 )  
 Array  
 (  
  [3] => f  
 )  
 */

array_map

功能：将回调函数执行到数组中 

  <?php  
 //定义回调函数  
 function  cube($n){ 
 return ($n * $n * $n); 
} 
$a  =   array ( 1 , 2 , 3 , 4 , 5 ); 
$b  =  array_map( "cube" ,$a); 
 echo   "<pre>" ; 
print_r($b); 
 echo   "</pre>" ; 
 /**结果  
 Array  
 (  
  [0] => 1  
  [1] => 8  
  [2] => 27  
  [3] => 64  
  [4] => 125  
 )  
 */

array_merge

功能：合并一个或多个数组

说明：如果后面有键名相同的会覆盖掉前面的内容，键名为数字的会添加到后面 

  <?php  
$array1  =   array ( "color"  =>  "red" , 2 , 4 ); 
$array2  =   array ( "a" , "b" , "color"  =>  "green" , "shape"  =>  "trapezoid" , 4 ); 
$result1  =  array_merge($array1,$array2); 
$result2  =  array_merge_recursive($array1,$array2); 
 echo   "<pre>" ; 
print_r($result1); 
print_r($result2); 
 echo   "</pre>" ; 
 /**结果  
 Array  
 (  
  [color] => green  
  [0] => 2  
  [1] => 4  
  [2] => a  
  [3] => b  
  [shape] => trapezoid  
  [4] => 4  
 )  
 Array  
 (  
  [color] => Array  
  (  
  [0] => red  
  [1] => green  
  )  
  [0] => 2  
  [1] => 4  
  [2] => a  
  [3] => b  
  [shape] => trapezoid  
  [4] => 4  
 )  
 */

array_pop

功能：剔除数组最后一个元素，返回被剔除的元素内容 

  <?php  
$stack  =   array ( "orange" , "banana" , "apple" , "1" ); 
$last  =  array_pop($stack); 
 echo   "<pre>" ; 
print_r($stack); 
print_r($last); 
 echo   "</pre>" ; 
 /**结果  
 Array  
 (  
  [0] => orange  
  [1] => banana  
  [2] => apple  
 )  
 1  
 */

array_push

功能：将一个多个单元压入数组末尾，返回之后的数组个数 

  <?php  
$stack  =   array ( "orange" , "banana" ); 
$count  =  array_push($stack, "apple" , "red" , "blue" ); 
 echo   "<pre>" ; 
print_r($stack); 
print_r($count); 
 echo   "</pre>" ; 
 /**结果  
 Array  
 (  
  [0] => orange  
  [1] => banana  
  [2] => apple  
  [3] => red  
  [4] => blue  
 )  
 5  
 */

array_rand

功能：获取随机的键名 

  <?php  
$input  =   array ( "orange" , "banana" , "apple" , "red" , "blue" ); 
$rand  =  array_rand($input, 2 );; 
print_r($rand); 
$rand  =  array_rand($input, 3 ); 
print_r($rand); 
 /**结果  
 Array  
 (  
  [0] => 1  
  [1] => 4  
 )  
 Array  
 (  
  [0] => 0  
  [1] => 1  
  [2] => 3  
 )  
 */

array_search

功能：查询数组中的内容，返回键值，如果有多个匹配，返回第一个匹配的内容 

  <?php  
$array  =   array ( "blue"  =>  "b" , "red"  =>  "r" , "green" , "r" ); 
$key  =  array_search( 'b' , $array); 
 echo  $key; 
 echo   "<br>" ; 
$key  =  array_search( 'r' , $array); 
 echo  $key; 
 echo   "<br>" ; 
 /**结果  
 blue  
 red  
 */

array_shift

功能：移除开头的元素，与array_pop相反 

  <?php  
$fruit  =   array ( "milk" , "orange" , "banana" , "apple" ); 
$top  =  array_shift($fruit); 
print_r($top); 
 echo   "<br>" ; 
print_r($fruit); 
 /**结果  
 milk  
 Array ( [0] => orange [1] => banana [2] => apple )  
 */

array_unique

功能：去除数组重复的元素，保留第一个出现的，包括键名和值 

 <?php  
$input  =   array ( "a"  =>  "green" , "red" , "b"  =>  "green" , "blue" , "c"  =>  "red" ); 
$result  =  array_unique($input); 
print_r($result); 
 echo   "<br>" ; 
print_r($input); 
 /**结果  
 Array ( [a] => green [0] => red [1] => blue )  
 Array ( [a] => green [0] => red [b] => green [1] => blue [c] => red )  
 */

array_slice

功能：从数组中取出部分元素 

  <?php  
$input  =   array ( "a" , "b" , "c" , "d" , "e" ); 
$output  =  array_slice($input, 2 ); //第二个参数没有时，表示取到最后一个元素  
print_r($output); 
 echo   "<br>" ; 
$output  =  array_slice($input, -  2 , 1 ); //第二个参数是正数时，表示个数；倒数第一个是-1，倒数第二个是-2  
print_r($output); 
 echo   "<br>" ; 
$output  =  array_slice($input, 0 , 3 ); 
print_r($output); 
 echo   "<br>" ; 
$output  =  array_slice($input, 2 , -  1 ); //第二个参数是负数时，表示位置，取到哪一位，不包括本身  
print_r($output); 
 echo   "<br>" ; 
$output  =  array_slice($input, 2 , -  1 , true ); //第三个参数为true时，保留原有的键值  
print_r($output); 
 echo   "<br>" ; 
 /**结果  
 Array ( [0] => c [1] => d [2] => e )  
 Array ( [0] => d )  
 Array ( [0] => a [1] => b [2] => c )  
 Array ( [0] => c [1] => d )  
 Array ( [2] => c [3] => d )  
 */

count

功能：返回数组元素个数，元素为数组的算一个 

  <?php  
$input  =   array ( "a" , "b" , "c" , array ( "d" , "e" )); 
$count  =  count($input); 
 echo  $count; 
 echo   "<br>" ; 
$input  =   array ( "a" , "b" , "c" , "d" , "e" ); 
$count  =  count($input); 
 echo  $count; 
 /**结果  
 4  
 5  
 */

current

功能:获取当前的指针指向元素 

  <?php  
$array  =   array ( "foot" , "bike" , "car" , "plane" ); 
$result  =  current($array); 
 echo  $result. "<br>" ; 
next($array); //使指针指向下一个元素  
$result  =  current($array); 
 echo  $result. "<br>" ; 
prev($array); //使指针指向前一个元素  
$result  =  current($array); 
 echo  $result. "<br>" ; 
end($array); //使指针指向最后一个元素  
$result  =  current($array); 
 echo  $result. "<br>" ; 
 /**结果  
 foot  
 bike  
 foot  
 plane  
 */

in_array

功能：检验某值是否存在数组中，有返回True，没有返回False 

 <?php  
$os_list  =   array ( " mac " , "NT" , "Irix" , "Linux" ); 
 if (in_array( "Irix" ,$os_list)){ 
  echo   "当前操作系统列表中存在Irix" ; 
} else { 
  
  echo   "当前操作系统列表中不存在Irix" ; 
} 
 echo   "<br>" ; 
 if (in_array( "mac" ,$os_list)){ 
  echo   "当前操作系统列表中存在mac" ; 
} else { 
  echo   "当前操作系统列表中不存在mac" ; 
} 
 echo   "<br>" ; 
 /**结果  
 当前操作系统列表中存在Irix  
 当前操作系统列表中不存在mac  
 */

list

功能：将数组中的信息赋值给多个变量 

 
  <?php  
$info  =   array ( "red" , "blue" , "green" ); 
 list ($flag,$sky,$grassland)  =  $info; 
 echo   "$flag,$sky,$grassland" ; 
 echo   "<br>" ; 
 list ($flag,,$grassland)  =  $info; 
 echo   "$flag,$grassland" ; 
 echo   "<br>" ; 
 list (,,$grassland)  =  $info; 
 echo   "$grassland" ; 
 echo   "<br>" ; 
 /**结果  
 red,blue,green  
 red,green  
 green  
 */

shuffle

功能：打乱数组 

  <?php  
$numbers  =  range( 1 , 5 ); //生成一个随机数组  
print_r($numbers); 
 echo   "<br/>" ; 
shuffle($numbers); //打乱数组  
print_r($numbers); 
 /**结果  
 Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 )  
 Array ( [0] => 4 [1] => 1 [2] => 5 [3] => 2 [4] => 3 )  
 */

array_keys

功能：获取数组的键名，第二个参数可以指定获取某个元素 

 <?php  
$array  =   array ( 0  =>  100 , "color"  =>  "red" ); 
print_r(array_keys($array)); 
 echo   "<br>" ; 
$array  =   array ( "blue" , "red" , "green" , "blue" , "blue" ); 
print_r(array_keys($array, "blue" )); 
 echo   "<br>" ; 
$array  =   array ( "color"  =>  array ( "blue" , "red" , "green" ), "size"  =>  array ( "small" , "medium" , "large" )); 
print_r(array_keys($array)); 
 echo   "<br>" ; 
 /**结果  
 Array ( [0] => 0 [1] => color )  
 Array ( [0] => 0 [1] => 3 [2] => 4 )  
 Array ( [0] => color [1] => size )  
 */

array_reverse

功能：获取数组的反向 

  <?php  
$input  =   array ( "php" , 3.0 , array ( "green" , "red" )); 
$result  =  array_reverse($input);  //打乱键名  
$result_keyed  =  array_reverse($input, TRUE ); //保留键名  
print_r($result); 
print_r($result_keyed); 
 /**结果  
 Array  
 (  
  [0] => Array  
  (  
  [0] => green  
  [1] => red  
  )  
  [1] => 3  
  [2] => php  
 )  
 Array  
 (  
  [2] => Array  
  (  
  [0] => green  
  [1] => red  
  )  
  [1] => 3  
  [0] => php  
 )  
 */

arsort

功能：逆向排序，索引不变 

  <?php  
$fruits  =   array ( 
  "a"  =>  "lemon" , 
  "b"  =>  "orange" , 
  "c"  =>  "banana" , 
  "d"  =>  "apple" , 
 ); 
arsort($fruits); //按照字符逆向排序或数字  
  foreach  ($fruits  as  $key => $val){ 
  echo   "$key = $val<br>" ; 
} 
 /**结果  
 b = orange  
 a = lemon  
 c = banana  
 d = apple  
 */

asort

功能：进行正向排序 

  <?php  
$fruits  =   array ( 
  "a"  =>  "lemon" , 
  "b"  =>  "orange" , 
  "c"  =>  "banana" , 
  "d"  =>  "apple" , 
 ); 
arsort($fruits); //按照字符逆向排序或数字  
 foreach ($fruits  as  $key => $val){ 
  echo   "$key = $val<br>" ; 
} 
 echo   "<p>" ; 
asort($fruits); //按照字符正向排序或数字  
 foreach ($fruits  as  $key => $val){ 
  echo   "$key = $val<br>" ; 
} 
 /**结果  
 b = orange  
 a = lemon  
 c = banana  
 d = apple  
 d = apple  
 c = banana  
 a = lemon  
 b = orange  
 */

krsort

功能：按照键名进行逆向排序 

  <?php  
$fruits  =   array ( 
  "a"  =>  "lemon" , 
  "b"  =>  "orange" , 
  "c"  =>  "banana" , 
  "d"  =>  "apple" , 
 ); 
krsort($fruits); //按照键名逆向排序或数字  
 foreach ($fruits  as  $key => $val){ 
  echo   "$key = $val<br>" ; 
} 
 /**结果  
 d = apple  
 c = banana  
 b = orange  
 a = lemon  
 */

ksort

功能：按照键名进行正向排序 

  <?php  
$fruits  =   array ( 
  "a"  =>  "lemon" , 
  "b"  =>  "orange" , 
  "c"  =>  "banana" , 
  "d"  =>  "apple" , 
 ); 
ksort($fruits); //按照键名正向排序或数字  
 foreach ($fruits  as  $key => $val){ 
  echo   "$key = $val<br>" ; 
} 
 /**结果  
 a = lemon  
 b = orange  
 c = banana  
 d = apple  
 */

rsort

功能：按照值进行逆向排序，键名改变 

  <?php  
$fruits  =   array ( 
  "a"  =>  "lemon" , 
  "b"  =>  "orange" , 
  "c"  =>  "banana" , 
  "d"  =>  "apple" , 
 ); 
rsort($fruits); //按照值进行逆向排序或数字，键名改变  
 foreach ($fruits  as  $key => $val){ 
  echo   "$key = $val<br>" ; 
} 
 /**结果  
 0 = orange  
 1 = lemon  
 2 = banana  
 3 = apple  
 */

sort

功能：按照值进行正向排序，键名改变 

  <?php  
$fruits  =   array ( 
  "a"  =>  "lemon" , 
  "b"  =>  "orange" , 
  "c"  =>  "banana" , 
  "d"  =>  "apple" , 
 ); 
sort($fruits); //按照值进行逆向排序或数字，键名改变  
 foreach ($fruits  as  $key => $val){ 
  echo   "$key = $val<br>" ; 
} 
 /**结果  
 0 = apple  
 1 = banana  
 2 = lemon  
 3 = orange  
 */

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文章来源：智云一二三科技

文章标题：Thinkphp数组array常用函数

文章地址：https://www.zhihuclub.com/31262.shtml

关于作者: 智云科技

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