PHP

PHP

🔍 PHP gettype() Function

gettype() in PHP is used to determine the exact data type of a variable. In simple terms, it answers the question: “What type of data is this variable holding?”

  • What Does gettype() Do? It returns the data type name as a string, helps prevent invalid operations, enables dynamic data inspection, and is widely used during debugging.

🛠️ Basic Usage & Examples

1️⃣ Basic Syntax
Passing a variable into gettype() returns its underlying type name.

PHP
$value = 10;
echo gettype($value); // Outputs: integer

2️⃣ Inspecting Different Data Types
Here is how gettype() handles various scalar and complex types:

PHP
echo gettype(10);        // Outputs: integer
echo gettype(3.14);      // Outputs: double
echo gettype("Hello");   // Outputs: string
echo gettype(true);      // Outputs: boolean
echo gettype([1, 2, 3]); // Outputs: array
echo gettype(null);      // Outputs: NULL

3️⃣ Comparing Similar Values
Even if two variables hold visually similar values, their underlying data types can differ:

PHP
$a = "100";
$b = 100;

echo gettype($a); // Outputs: string
echo gettype($b); // Outputs: integer

4️⃣ Using Inside Conditional Statements
You can inspect variables dynamically within functions to route execution logic:

PHP
function checkData($data) {
    if (gettype($data) == "integer") {
        echo "This is a number.";
    } else {
        echo "This is not an integer.";
    }
}

checkData(5); // Outputs: This is a number.

📊 Values Returned by gettype()

The standard string outputs returned by gettype():

  • integer → Returns "integer"
  • float → Returns "double" (Historical note: PHP returns "double" for float values)
  • string → Returns "string"
  • boolean → Returns "boolean"
  • array → Returns "array"
  • object → Returns "object"
  • null → Returns "NULL"
  • resource → Returns "resource"

  • ⚡ gettype() vs. is_* Functions

  • For Type Verification: Use is_* functions (is_int(), is_string(), is_array()) because they are optimized for boolean checks.
  • For Inspection & Debugging: Use gettype() when you need to print or log the variable's type directly.
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