How to determine if all values ​​in an array are not empty in php

Steps: 1. Use the array_filter() function to filter the array. The syntax "array_filter (original array);" will return an array containing all non-empty elements; 2. Use the count() function to obtain the original array. and the length of the filtered array, and compare whether the lengths of the two arrays are equal. The syntax is "count (original array) == count (filtered array)". If they are equal, all values ​​in the array are not empty. If they are not equal, there are values ​​in the array. null.

The operating environment of this tutorial: windows7 system, PHP version 8.1, DELL G3 computer

In php, you can use array_filter() and The count() function determines whether all values ​​in the array are not empty

Judgment steps:

Step 1: Use array_filter( ) function filters the array and gets the elements that are not empty

• array_filter() filters the array and returns the elements of the symbolic condition

array_filter The function of the function is to use the callback function to filter the array. I always thought that the callback function can be used to process it, but I didn't find that there is another sentence in the manual. If there is no callback function, the default is to delete the items with a false value in the array.

$res=array_filter($arr);

Will return a filtered array containing all non-empty elements

Step 2: Use the count() function to obtain the length of the original array and the filtered array, and compare the lengths of the two arrays Whether the lengths are equal

count(原数组)==count(过滤数组)

• If equal, all values ​​in the array are not empty (because no element is filtered out)

• If they are not equal, the value in the array is empty

Full example code:

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);
$arr=array(1,&#39;h&#39;,TRUE,FALSE,null,99,100);
var_dump($arr);

echo "过滤后的数组：";
$res=array_filter($arr);
var_dump($res);

if(count($arr)==count($res)){
    echo "数组所有值都不为空";
}else{
    echo "数组中有值为空";
}
?>

Description:

array_filter() function

array_filter() function uses a callback function to filter the elements in the array elements, a filtered array will be returned.

This function passes each key value in the input array to the callback function. If the callback function returns true, the current key value in the input array is returned to the result array. Array key names remain unchanged.

array array_filter ( $array , 回调函数 )

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