What is the function in php to detect whether the array is all empty?

Two functions to detect whether the array is all empty: 1. empty(), just pass the array variable into this function, the syntax is "empty($arr)", if it returns true, all is empty, otherwise it is not empty. 2. count() can obtain the array length. If the obtained array length is less than 1, the array is empty, otherwise it is not empty.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

In php, you can use some two functions To detect whether the array is all empty:

• empty() function

• count() function

1. Use the empty() function

The empty() function is used to check whether a variable is empty.

empty() Determines whether a variable is considered empty. When a variable does not exist, or its value is equal to FALSE, then it is considered not to exist. empty() does not generate a warning if the variable does not exist.

Pass the array into this function. If it is true, it means it is empty;

<?php
header("Content-type:text/html;charset=utf-8");
$arr = [];
var_dump($arr);
if (empty($arr)) {
 echo "数组为空<br>";

} else {
 echo "数组不为空<br>";
}
?>

2. Use the count() function

The count() function can count the number of all elements in the array, that is, obtain the length of the array.

If the length of the array obtained is 0, or less than 1, it means that there are no elements in the array, that is, it is an empty array.

<?php
header("Content-type:text/html;charset=utf-8");
$arr = [1,2];
var_dump($arr);
if (count($arr) < 1) {
 echo "数组为空<br>";

} else {
 echo "数组不为空<br>";
}
?>

Recommended learning: "PHP Video Tutorial", "PHP ARRAY"

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