A. php 如何判斷數組里有多個值相同
PHP 中的 array_count_values() 函數可以實現
array_count_values() 函數用於統計數組中所有值出現的次數。
本函數返回一個數組，其元素的鍵名是原數組的值，鍵值是該值在原數組中出現的次數。
array_count_values(array)
例如：
<?php
$a=array("Cat","Dog","Horse","Dog");
print_r(array_count_values($a));
?>
輸出：
Array ( [Cat] => 1 [Dog] => 2 [Horse] => 1 )
B. php，檢測與數組數據相同的個數
<?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判斷兩個數組是否有相同的元素
$arr1=array(1,2,3,4,5,6,7,8,9,1,2,3,4,5);//設定需要判斷的數組
$num1 = count($arr1);//提取該數組的數目
$arr2 = array_unique($arr1);//合並相同的元素
$num2 = count($arr2);//提取合並後數組個數
if($num1>$num2)//判斷下大小
{
echo "該數組含有重復元素";
}
else
{
echo "該數組不含有重復元素";
}