PHP string cast vs strval function, which one should I use?

In PHP, you can convert values to strings using either (string) cast or the strval() function. Both methods achieve the same result but differ in their implementation and performance characteristics.

String Cast vs strval() Function

The strval() function is a function call whereas (string) cast is an internal type casting method. PHP uses automatic type conversion, so a variable's type is determined based on the context in which it is used.

Basic Usage Examples

Using String Cast

<?php
    $number = 42;
    $float = 3.14;
    $boolean = true;
    
    $str1 = (string)$number;
    $str2 = (string)$float;
    $str3 = (string)$boolean;
    
    echo "Number: " . $str1 . " (Type: " . gettype($str1) . ")
";
    echo "Float: " . $str2 . " (Type: " . gettype($str2) . ")
";
    echo "Boolean: " . $str3 . " (Type: " . gettype($str3) . ")
";
?>

Number: 42 (Type: string)
Float: 3.14 (Type: string)
Boolean: 1 (Type: string)

Using strval() Function

<?php
    $number = 42;
    $float = 3.14;
    $boolean = true;
    
    $str1 = strval($number);
    $str2 = strval($float);
    $str3 = strval($boolean);
    
    echo "Number: " . $str1 . " (Type: " . gettype($str1) . ")
";
    echo "Float: " . $str2 . " (Type: " . gettype($str2) . ")
";
    echo "Boolean: " . $str3 . " (Type: " . gettype($str3) . ")
";
?>

Number: 42 (Type: string)
Float: 3.14 (Type: string)
Boolean: 1 (Type: string)

Key Differences

The strval($var) function returns the string value of $var whereas (string)$var explicitly converts the "type" of $var during evaluation. Both can work with scalar types or objects that implement the __toString method.

Limitations with Arrays

<?php
    $array = [1, 2, 3];
    
    // String cast will produce "Array"
    $cast_result = (string)$array;
    echo "Cast result: " . $cast_result . "
";
    
    // strval() cannot be used on arrays - it would also produce "Array"
    $strval_result = strval($array);
    echo "strval result: " . $strval_result . "
";
?>

Cast result: Array
strval result: Array

Performance Comparison

Conclusion

Both methods work interchangeably for most use cases. Use (string) cast for better performance, or strval() when code readability is prioritized. The (string) cast is generally recommended due to its speed advantage.