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
本文实例总结了PHP常用数组array函数。分享给大家供大家参考，具体如下：
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
案例：
一 [two] => 二 [three] => 三 )
*/
array_chunk
功能：拆分数组成多个数组
"apple","b"=>"blue","c","d","e");
echo "
";
print_r(array_chunk($input_array,2));
print_r(array_chunk($input_array,2,True));
echo "
";
/**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
"apple","e");
echo "
";
print_r(array_count_values($input_array));
echo "
";
/**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
"apple","e");
$array2 = array("apple","f");
$result = array_diff($array1,$array2);
$result2 = array_diff($array2,$array1);
echo "
";
print_r($result);//数组1中去掉数组2中剩下的
print_r($result2);//数组2中去掉数组1中剩下的
echo "
";
/**结果
Array
(
[b] => blue
[2] => e
)
Array
(
[3] => f
)
*/
array_map
功能：将回调函数执行到数组中
";
print_r($b);
echo "";
/**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
"red",4);
$array2 = array("a","b","color"=>"green","shape"=>"trapezoid",4);
$result1 = array_merge($array1,$array2);
$result2 = array_merge_recursive($array1,$array2);
echo "
";
print_r($result1);
print_r($result2);
echo "
";
/**结果
Array
(
[color] => green
[0] => 2
[1] => 4
[2] => a
[3] => b
[shape] => trapezoid
[4] => 4
)
Array
(
[color] => Array
(
[0] => red
[1] => green
)
[0] => 2
[1] => 4
[2] => a
[3] => b
[shape] => trapezoid
[4] => 4
)
*/
array_pop
功能：剔除数组最后一个元素，返回被剔除的元素内容
";
print_r($stack);
print_r($last);
echo "";
/**结果
Array
(
[0] => orange
[1] => banana
[2] => apple
)
1
*/
array_push
功能：将一个多个单元压入数组末尾，返回之后的数组个数
";
print_r($stack);
print_r($count);
echo "";
/**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
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
"b","red"=>"r","green","r");
$key = array_search('b',$array);
echo $key;
echo "
";
$key = array_search('r',$array);
echo $key;
echo "
";
/**结果
blue
red
*/
array_shift
功能：移除开头的元素，与array_pop相反
";
print_r($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
"green","b"=>"green","blue","c"=>"red");
$result = array_unique($input);
print_r($result);
echo "
";
print_r($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
";
$output = array_slice($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 "
";
$output = array_slice($input,3);
print_r($output);
echo "
";
$output = array_slice($input,-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 "
";
$output = array_slice($input,-1,true);//第三个参数为true时，保留原有的键值
print_r($output);
echo "
";
/**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
";
$input = array("a","e");
$count = count($input);
echo $count;
/**结果
4
5
*/
current
功能:获取当前的指针指向元素
";
next($array);//使指针指向下一个元素
$result = current($array);
echo $result."
";
prev($array);//使指针指向前一个元素
$result = current($array);
echo $result."
";
end($array);//使指针指向最后一个元素
$result = current($array);
echo $result."
";
/**结果
foot
bike
foot
plane
*/
in_array
功能：检验某值是否存在数组中，有返回True，没有返回False
";
if(in_array("mac",$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 "
";
/**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
";
list($flag,$grassland";
echo "
";
list(,$grassland) = $info;
echo "$grassland";
echo "
";
/**结果
red,blue,green
red,green
green
*/
shuffle
功能：打乱数组
";
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
(
[0] => green
[1] => red
)
[1] => 3
[2] => PHP
)
Array
(
[2] => Array
(
[0] => green
[1] => red
)
[1] => 3
[0] => PHP
)
*/
"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 = $val
";
}
/**结果
b = orange
a = lemon
c = banana
d = apple
*/
"lemon",);
krsort($fruits);//按照键名逆向排序或数字
foreach($fruits as $key=>$val){
echo "$key = $val
";
}
/**结果
d = apple
c = banana
b = orange
a = lemon
*/
"lemon",);
ksort($fruits);//按照键名正向排序或数字
foreach($fruits as $key=>$val){
echo "$key = $val
";
}
/**结果
a = lemon
b = orange
c = banana
d = apple
*/
"lemon",);
rsort($fruits);//按照值进行逆向排序或数字，键名改变
foreach($fruits as $key=>$val){
echo "$key = $val
";
}
/**结果
0 = orange
1 = lemon
2 = banana
3 = apple
*/
"lemon",);
sort($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
";
}
/**结果
0 = apple
1 = banana
2 = lemon
3 = orange
*/
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