PHP is a very popular programming language and one of the most popular languages for web development. In PHP, array is a very commonly used data type that can store multiple values in the form of an array. In PHP, determining whether a variable is an array requires some specific methods, which we will explain in detail next.
- Use the is_array() function to determine
PHP provides a built-in function is_array(), which is used to determine whether a variable is an array type. The use of the is_array() function is very simple. You only need to pass the variable to be judged as a parameter to the function. Returns true if the variable is of array type; false if not.
The specific code implementation is as follows:
<?php $arr = array(1, 2, 3); $str = "Hello World!"; var_dump(is_array($arr)); // 输出 bool(true) var_dump(is_array($str)); // 输出 bool(false) ?>
As can be seen from the above code, the is_array() function can quickly determine whether a variable is an array, which is very convenient and practical.
- Use gettype() and is_array() functions together
In addition to using is_array() function, you can also use gettype() and is_array() functions together Use to determine whether a variable is an array type. The gettype() function is used to get the type of a variable and returns a string value. Returns "array" if the variable is of type array, or some other value if it is not of type array.
The specific code implementation is as follows:
<?php $arr = array(1, 2, 3); $str = "Hello World!"; if (gettype($arr) == "array" && is_array($arr)) { echo "arr is an array!"; // 输出 arr is an array! } if (gettype($str) == "array" && is_array($str)) { echo "str is an array!"; } ?>
As can be seen from the above code, when we need to determine whether a variable is an array type at the same time, we can use the gettype() and is_array() functions Used together, this will be more accurate.
Summary
In PHP, it is very simple to determine whether a variable is an array type. We can use the is_array() function or use the gettype() and is_array() functions together to achieve this. But it should be noted that in PHP, except for the keyword NULL, all values can be regarded as array types, so we need to handle it carefully in actual development to avoid errors.
The above is the detailed content of How to determine if a variable is an array in php. For more information, please follow other related articles on the PHP Chinese website!

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