PHP Get Duplicate Elements in an Array Example Tutorial

PHP Get Duplicate Elements in an Array Example Tutorial_PHP Tutorial

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Release： 2016-07-20 11:16:54

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　　1.获取一个数组中重复的元素。代码如下:

　　a.方法一:

代码如下

function array_repeat($arr)
{
if(!is_array($arr)) return $arr;

$arr1 = array_count_values($arr);

$newArr = array();

foreach($arr1 as $k=>$v)
{
if($v>1) array_push($newArr,$k);
}
return $newArr;
}

代码如下
function array_repeat($arr) { if(!is_array($arr)) return $arr; $arr1 = array_count_values($arr); $newArr = array(); foreach($arr1 as $k=>$v) { if($v>1) array_push($newArr,$k); } return $newArr; }

　　b.方法二:

代码如下

function array_repeat($arr)
{
if(!is_array($arr)) return $arr;

$arr1 = array_unique($arr);

$arr3 = array_diff_key($arr,$arr1);

return array_unique($arr3);
}

代码如下
function array_repeat($arr) { if(!is_array($arr)) return $arr; $arr1 = array_unique($arr); $arr3 = array_diff_key($arr,$arr1); return array_unique($arr3); }

　　测试方法

代码如下

$arr = array('apple','blue','red','banana','pear','apple','blue','color','color');
print_r(array_repeat($arr));

代码如下

$arr = array('apple','blue','red','banana','pear','apple','blue','color','color');
print_r(array_repeat($arr));

结果: Array ( [5] => apple [6] => blue [8] => color )

Later, some methods of deleting duplicate elements from arrays

　array_keys function to delete duplicate elements from the array.

The code is as follows

$a=array("red", "green", "blue", "yellow");
count($a); //Get 4
unset($a[1]); //Delete the second element
count($a); //Get 3
echo $a[2]; //There are only three elements in the array. I wanted to get the last element, but I got blue,
echo $a[1]; //No value

代码如下

$a=array("red", "green", "blue", "yellow");
count($a); //得到4
unset($a[1]); //删除第二个元素
count($a); //得到3
echo $a[2]; //数组中仅有三个元素,本想得到最后一个元素,但却得到blue,
echo $a[1]; //无值

//array array_splice (array input, int offset [, int length [, array replacement]])
//array_splice()其实是替换数组元素的函数,但如果不加替换值就简单的删除元素.下面是array_splice()的用法:
$b=array("red", "green", "blue", "yellow");
array_splice($a,1,1);

//array array_splice (array input, int offset [, int length [, array replacement]])
//array_splice() is actually a function that replaces array elements, but if you do not add a replacement value, it simply deletes the element. The following is the usage of array_splice():
$b=array("red", "green", "blue", "yellow");
array_splice($a,1,1);

　　//下面看一个比较全面的删除重复值并且删除指定的数组元素

代码如下

$array1 = array(1 => "www.45it.net", 2 => "菠萝", 4 => "www.45it.net",3 => "香蕉",4 => "芭乐",5 => "www.45it.net",6 => "www.45it.net");

代码如下

$array1 = array(1 => "www.45it.net", 2 => "菠萝", 4 => "www.45it.net",3 => "香蕉",4 => "芭乐",5 => "www.45it.net",6 => "www.45it.net");

$search_keys = array_keys($array1, "www.45it.net");

foreach($search_keys as $key) {
unset($array1[$key]);
}

print_r($array1);

/*
得到结果
array ( [2] => 菠萝 [4] => 芭乐 [3] => 香蕉 )
*/

//删除数组中重复元素的函数
function delmember(&$array, $id)
{
$size = count($array);
for($i = 0; $i <$size - $id - 1; $i ++)
{
$array[$id + $i] = $array[$id + $i + 1];
}
unset($array[$size - 1]);
}

$search_keys = array_keys($array1, "www.45it.net");<🎜>

foreach($search_keys as $key) {
unset($array1[$key]);
}<🎜>

print_r($array1);<🎜>

/*
得到结果
array ( [2] => 菠萝 [4] => 芭乐 [3] => 香蕉 )
*/