A. php 如何判断数组里有多个值相同
PHP 中的 array_count_values() 函数可以实现
array_count_values() 函数用于统计数组中所有值出现的次数。
本函数返回一个数组，其元素的键名是原数组的值，键值是该值在原数组中出现的次数。
array_count_values(array)
例如：
<?php
$a=array("Cat","Dog","Horse","Dog");
print_r(array_count_values($a));
?>
输出：
Array ( [Cat] => 1 [Dog] => 2 [Horse] => 1 )
B. php，检测与数组数据相同的个数
<?php
$arr1=array("1","2","3","4","5","6","7","8","9","10");
$arr2=array("11","12","13","14","15","16","17","18","19","20");
$a=2;
$b=6;
$c=9;
$d=11;
$e=15;
$f=20;
$x=$y=0;
foreach(array($a,$b,$c,$d,$e,$f)as$test){
in_array($test,$arr1)&&$x++;
in_array($test,$arr2)&&$y++;
}
echo"x:",$x,"y:",$y," ";
C. php判断两个数组是否有相同的元素
$arr1=array(1,2,3,4,5,6,7,8,9,1,2,3,4,5);//设定需要判断的数组
$num1 = count($arr1);//提取该数组的数目
$arr2 = array_unique($arr1);//合并相同的元素
$num2 = count($arr2);//提取合并后数组个数
if($num1>$num2)//判断下大小
{
echo "该数组含有重复元素";
}
else
{
echo "该数组不含有重复元素";
}