How to determine whether an array is empty in php (three methods)

In PHP, we often use arrays to store a series of data. When performing some data operations, we need to first determine whether the array is empty. This article will introduce several methods to determine whether a PHP array is empty.

1. Use the count() function

The count() function can return the number of elements in the array. If an array does not have any elements, the function returns 0. Therefore, we can use the count() function to determine whether an array is empty.

The sample code is as follows:

if(count($array) == 0){
    // 数组为空
}

2. Use the empty() function

The empty() function can check whether a value is empty. The empty() function returns true when a variable is one of the following values:

• "" (empty string)
• 0 (string or integer as an integer)
• 0.0 (a string or a float as a float)
• "0" (a number as a string)
• NULL
• FALSE
• Empty Array

Therefore, we can use the empty() function to determine whether an array is empty.

The sample code is as follows:

if(empty($array)){
    // 数组为空
}

3. Use the is_array() function

The is_array() function can check whether the variable is an array. If a variable is an array, the function will return true. Therefore, we can use the is_array() function to determine whether a variable is an array, and cooperate with the count() function to determine whether an array is empty.

The sample code is as follows:

if(is_array($array) && count($array) == 0){
    // 数组为空
}

These are methods to determine whether a PHP array is empty. In actual development, we should choose a method that suits us according to our needs to determine whether the array is empty.

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