PHP: Array data type instance details in PHP, there are a series of functions that detect data types, which can be used to detect different types of data to determine if they belong to the meter data type, and return true if they match, otherwise false.
The functions of the PHP detection data type are the following table
Function |
Detection type |
Example |
Is_bool |
Detects if a variable is a Boolean type |
Is_bool (True), Is_bool (false) |
Is_string |
Detects if a variable is a string type |
Is_string (' string '), is_string (1234) |
Is_integer/is_int |
Detects if a variable is an integer |
Is_integer (Is_integer), (' 34 ') |
Is_float/is_double |
Detects if a variable is a floating-point type |
Is_float (3.1415), is_float (' 3.1415 ') |
Is_array |
Detects if a variable is an array type |
Is_array ($arr) |
Is_object |
Detects if a variable is an object type |
Is_object ($obj) |
Is_null |
Detects if a variable is null |
Is_null (NULL) |
Is_numeric |
A string that detects whether a variable is a number or a number |
Is_numeric (' 5 '), Is_numeric (' bccd110 ') |
PHP Data Type detection instance
The functions and usages of the PHP detection data type are the same, and the following example uses the Is_numeric () function to detect whether the data in the variable is a number.
<?phpheader ("Content-type:text/html;charset=utf-8"); Set character encoding $boo= "1234567890"; Describes a string variable that consists entirely of numbers if (Is_numeric ($boo)) { //Determines whether the variable is made up of numbers echo "Variable Boo belongs to a string type consisting of numbers:". $boo; If the variable is output}else echo "cannot be judged";//Otherwise, the statement is output?>
Code Run Result:
The above example is the use of our is series functions.
In this chapter, we explain a series of PHP data types: PHP Eight data types, PHP: Boolean type (Boolean) data type instance, PHP: String data type instance details, PHP: integer type (integer) data type instance detailed, PHP: Examples of floating-point (float) data types in detail, PHP: Array data type instances, PHP: Object data type examples, PHP: Resource (Resource) data type examples, PHP: null (NULL) data type instance in detail, PHP data type Conversion example in detail I hope you through this series of learning, PHP data types have a deeper understanding.
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