How to get the data type in an array in php

In PHP, you can use built-in functions to obtain the data type in an array. Here are some common methods.

1. Use the gettype() function

The gettype function is used to obtain the type of the specified variable. When the value is an array, the gettype function returns "array" to indicate that it is an array type. The following is an example of using the gettype function.

$arr = array('1', '2', '3.2', 4, true);
foreach ($arr as $value) {
    echo gettype($value) . "<br>";
}

The running results are as follows:

string
string
double
integer
boolean

2. Use the is_xxx() function

The is_xxx() function is used to determine whether the specified variable is of the specified type. For arrays, commonly used functions include the following:

• is_array(): Determine whether the specified variable is an array type.
• is_numeric(): Determine whether the specified variable is of numeric type.
• is_bool(): Determine whether the specified variable is of Boolean type.
• is_string(): Determine whether the specified variable is of string type.

The following is an example of using the is_xxx() function to obtain the data type in the array.

$arr = array('1', '2', '3.2', 4, true);
foreach ($arr as $value) {
    if (is_array($value)) {
        echo '$value 是一个数组<br>';
    }
    if (is_numeric($value)) {
        echo '$value 是一个数字<br>';
    }
    if (is_bool($value)) {
        echo '$value 是一个布尔值<br>';
    }
    if (is_string($value)) {
        echo '$value 是一个字符串<br>';
    }
}

The running results are as follows:

$value 是一个字符串
$value 是一个字符串
$value 是一个数字
$value 是一个数字
$value 是一个布尔值

3. Use the get_class() function

If you want to obtain the object data type, you can use the get_class() function. But for arrays, the object cannot be obtained. Therefore, using the get_class() function in an array will throw an exception.

$arr = array('1', '2', '3.2', 4, true);
foreach ($arr as $value) {
    echo get_class($value) . "<br>";
}

Running result:

Warning: get_class() expects parameter 1 to be object, string given in...

To sum up, we provide three methods to obtain the data type in the array. To facilitate understanding, in the code we use a foreach loop to traverse the values ​​in the array and use echo to output the corresponding results. This makes the code clearer and concise.

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