PHP Type Casting

Type casting is the process of explicitly converting a variable from one data type to another. Since PHP is loosely typed, it often does this automatically, but there are times when you need to force a specific type for security or calculation reasons.

How to Cast

To cast a variable, you place the name of the desired data type in parentheses before the variable you want to convert.

<?php
    $x = 5; // Integer
    $x = (string) $x; // Now $x is a String "5"
    var_dump($x);
?>

Supported Casting Operators

PHP recognizes the following operators for explicit casting:

Practical Examples

Float to Integer

Casting a float to an integer will always **truncate** the decimal part (it does NOT round to the nearest number).

<?php
    $num = 45.89;
    echo (int)$num; // Outputs: 45
?>

Array to Object

Converting an array to an object turns the array keys into object properties. This is very common when working with JSON data.

<?php
    $userArray = ["name" => "John", "age" => 25];
    $userObj = (object)$userArray;
    
    echo $userObj->name; // Outputs: John
?>

The settype() Function

An alternative to parentheses casting is the settype() function. Unlike parentheses casting (which returns a new value), settype() modifies the original variable.

<?php
    $val = "100 apples";
    settype($val, "integer");
    echo $val; // Outputs: 100
?>

Key Points to Remember

• Type casting is explicit conversion using parentheses like (int).
• Casting a float to an integer removes decimals without rounding.
• You can convert Arrays to Objects to use arrow syntax (->).
• Parentheses casting returns a new value; **settype()** changes the variable.
• Casting is a standard security practice to ensure input data matches the expected type.