How to convert null array to empty in php

How to convert php array null to empty string: First create a PHP sample file; then use the "function null2none(&$arr) {...}" method to convert the null value to an empty string. .

The operating environment of this article: Windows 7 system, PHP version 7.1, DELL G3 computer

How to convert a null array in php to empty? PHP null value to empty string method

/*
 * null值转为空字符串 @param array $arr
 */
function null2none(&$arr) {
foreach ( $arr as $key => $val ) {
if (is_null ( $val )) {
$arr [$key] = '';
}
if (is_array($arr[$key])) {
null2none($arr[$key]);
}
}
}

Related introduction:

• is_array - Check whether the variable is an array

is_array ( mixed $var ) : bool

If var is an array, return true, otherwise return false.

• is_null() function is used to detect whether a variable is NULL.

bool is_null ( mixed $var )

Recommended study: "PHP Video Tutorial"

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