What is the function in php to determine whether it is an array?

In PHP, it is often necessary to determine whether a variable is an array, which can be achieved through built-in functions. This article will introduce three PHP functions to determine whether a variable is an array.

1. is_array function: The is_array function is the most basic function provided by PHP to determine whether a variable is an array. This function accepts one parameter, which is the variable to check, and returns true if the variable is an array, otherwise it returns false. The code example is as follows:

$arr = array(1, 2, 3);
if (is_array($arr)) {
    echo '$arr是数组';
} else {
    echo '$arr不是数组';
}

2. gettype function: The gettype function is a function provided by PHP to obtain the variable type. This function accepts one parameter, the variable to be checked, and returns the type of the variable. If the variable is an array, returns 'array'. The code example is as follows:

$arr = array(1, 2, 3);
if (gettype($arr) == 'array') {
    echo '$arr是数组';
} else {
    echo '$arr不是数组';
}

3. is_iterable function in PHP 7: The is_iterable function is a new function introduced in PHP 7 for checking whether a variable is iterable. This function accepts one parameter, which is the variable to be checked, and returns true if the variable is an array or an object that implements the Traversable interface, otherwise it returns false. The sample code for using the is_iterable function to determine whether a variable is an array is as follows:

$arr = array(1, 2, 3);
if (is_iterable($arr)) {
    echo '$arr是数组';
} else {
    echo '$arr不是数组';
}

No matter which method is used, it is very simple to determine whether a variable is an array in PHP. Through these functions, we can easily determine whether a variable is an array, thereby ensuring that our code executes correctly.

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