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(PECL spl_types >= 0.1.0)
Examples:
SplString usage example
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<?php
$string = new SplString("Testing");
 
try {
    $string = array();
} catch (UnexpectedValueException $uve) {
    echo $uve->getMessage() . PHP_EOL;
}
 
var_dump($string);
echo $string; // Outputs "Testing"
?>

The above example will output:

Value not a string
object(SplString)#1 (1) {
  ["__default"]=>
  string(7) "Testing"
}
Testing