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Obtaining steps: 1. Use the array_diff() function to compare two arrays, which will return a difference array containing different elements. The syntax is "array_diff(array 1, array 2)"; 2. Use count() The function counts the number of elements in the difference array, and the syntax is "count(difference array)".
The operating environment of this tutorial: windows7 system, PHP8.1 version, DELL G3 computer
php Get two The number of different elements in the array
In PHP, you can use the array_diff() and count() functions to get the number of different elements in the two arrays.
Step 1: Use the array_diff() function to compare arrays and return the difference between the two arrays
The array_diff() function compares the key values of the array and returns a value containing Difference array of different elements
<?php header("Content-type:text/html;charset=utf-8"); $arr1=array(1,2,3,4,5,6); $arr2=array(1,2,4,6,8,9); var_dump($arr1); var_dump($arr2); echo "差集数组:"; $result=array_diff($arr1,$arr2); var_dump($result); ?>
Step 2: Use the count() function to count the number of elements in the difference array
## The #count() function can count the number of all elements in an array.<?php header("Content-type:text/html;charset=utf-8"); $arr1=array(1,2,3,4,5,6); $arr2=array(1,2,4,6,8,9); var_dump($arr1); var_dump($arr2); echo "差集数组:"; $result=array_diff($arr1,$arr2); var_dump($result); $len=count($result); echo "不同元素的个数为:".$len; ?>
Description:
array_diff() function is used to compare two (or more ) value of the array and returns the difference set. This function compares the values of two (or more) arrays (key=>value in value), and returns a difference array, which includes all the arrays being compared (array1 ), but not in any other parameter array (array2). Recommended learning: "PHP Video Tutorial"
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